CN116768435B - Environment-friendly silt stabilizing curing agent and preparation method thereof - Google Patents
Environment-friendly silt stabilizing curing agent and preparation method thereof Download PDFInfo
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- CN116768435B CN116768435B CN202310614244.8A CN202310614244A CN116768435B CN 116768435 B CN116768435 B CN 116768435B CN 202310614244 A CN202310614244 A CN 202310614244A CN 116768435 B CN116768435 B CN 116768435B
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- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 229920001661 Chitosan Polymers 0.000 claims abstract description 102
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims abstract description 102
- 239000010802 sludge Substances 0.000 claims abstract description 94
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 77
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 71
- 239000010881 fly ash Substances 0.000 claims abstract description 52
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims abstract description 45
- 229910000077 silane Inorganic materials 0.000 claims abstract description 45
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000000178 monomer Substances 0.000 claims abstract description 39
- 239000004568 cement Substances 0.000 claims abstract description 35
- 238000004132 cross linking Methods 0.000 claims abstract description 24
- 239000000292 calcium oxide Substances 0.000 claims abstract description 20
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 20
- 239000011358 absorbing material Substances 0.000 claims abstract description 19
- UMPKMCDVBZFQOK-UHFFFAOYSA-N potassium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[K+].[Fe+3] UMPKMCDVBZFQOK-UHFFFAOYSA-N 0.000 claims abstract description 19
- 230000006641 stabilisation Effects 0.000 claims abstract description 17
- 238000011105 stabilization Methods 0.000 claims abstract description 17
- 238000010306 acid treatment Methods 0.000 claims abstract description 5
- 239000007864 aqueous solution Substances 0.000 claims description 34
- 239000011259 mixed solution Substances 0.000 claims description 33
- 238000006243 chemical reaction Methods 0.000 claims description 29
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 238000001035 drying Methods 0.000 claims description 15
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 14
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 230000003213 activating effect Effects 0.000 claims description 11
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- 239000003431 cross linking reagent Substances 0.000 claims description 8
- 239000003999 initiator Substances 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- 150000004645 aluminates Chemical class 0.000 claims description 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 238000006703 hydration reaction Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 12
- 238000005406 washing Methods 0.000 description 12
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical group [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 11
- 230000036571 hydration Effects 0.000 description 10
- 229910052757 nitrogen Inorganic materials 0.000 description 10
- 239000000243 solution Substances 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 239000010883 coal ash Substances 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- 239000010703 silicon Substances 0.000 description 7
- 239000004927 clay Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical group C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 description 6
- FWFGVMYFCODZRD-UHFFFAOYSA-N oxidanium;hydrogen sulfate Chemical compound O.OS(O)(=O)=O FWFGVMYFCODZRD-UHFFFAOYSA-N 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 239000003469 silicate cement Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000002250 absorbent Substances 0.000 description 5
- 239000000499 gel Substances 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 239000002689 soil Substances 0.000 description 5
- 230000002745 absorbent Effects 0.000 description 4
- 229920001296 polysiloxane Polymers 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003864 humus Substances 0.000 description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 150000004677 hydrates Chemical class 0.000 description 2
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- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229960004887 ferric hydroxide Drugs 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000000017 hydrogel Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 iron ions Chemical class 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000007348 radical reaction Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The application provides an environment-friendly sludge stabilization curing agent and a preparation method thereof, wherein the environment-friendly sludge stabilization curing agent comprises the following components in parts by mass: 50 parts of cement, 10-30 parts of modified fly ash, 15-30 parts of quicklime, 20-30 parts of active water absorbing material and 1-8 parts of potassium ferrate, wherein the modified fly ash is obtained by acid treatment of the fly ash, the active water absorbing material comprises silane crosslinked carboxymethyl chitosan, and the silane crosslinked carboxymethyl chitosan is obtained by co-crosslinking carboxymethyl chitosan, hydrophilic functional monomers and organosilicon. The silt stabilizing and curing agent can be used for curing silt, improves the strength of the cured silt, enlarges the application range of the cured silt, promotes the utilization of silt resources and protects the environment.
Description
Technical Field
The application relates to the technical field of sludge treatment, in particular to an environment-friendly sludge stabilizing and curing agent and a preparation method thereof.
Background
Sludge refers to a class of weak fine or very fine structural special soil that is deposited under still or slow running water environmental conditions, accompanied by biochemical action, unconsolidated. With the development of economy, engineering construction of ports, channels and coasts is rapidly increasing in order to develop and utilize marine resources, and a great deal of problems caused by sludge are often encountered in the engineering.
In order to relieve the damage of a large amount of sludge waste dumping to ocean resources and the environment, and realize the recycling of the sludge resources. The curing treatment in the sludge treatment mode is an economic, reasonable and environment-friendly treatment method suitable for most of sludge, and domestic and foreign scholars continuously develop novel curing agents for curing various sludge, and the types of the curing agents are various and the division modes are also various. According to the state of the curing agent, the curing agent can be divided into powder curing agent and liquid curing agent; the inorganic compound curing agent, the organic compound curing agent and the composite curing agent are divided according to chemical components.
The engineering applicability of the sludge curing treatment depends on various factors such as the cost of the curing agent, the curing effect of the curing agent, the influence of the curing agent on the environment and the like. At present, most of curing treatment methods at home and abroad are difficult to meet the reasonable configuration among all factors. Although the traditional lime curing agent is low in cost, the blending amount is high, the cured silt and the surrounding water body are easy to be caused to be strong in alkalinity, and the cured silt generally shows brittle behavior affecting structural stability; the novel curing material has excellent curing effect, but the cost is far higher than that of the traditional curing material. Considering that sludge is affected by agricultural, industrial and domestic pollution, the pollutants such as heavy metals and the like in the sludge can cause secondary pollution to surrounding soil and water body, so that a series of secondary environmental problems are caused, and in recent years, the choice of nontoxic, stable and environment-friendly curing materials is increasingly favored in engineering application. Therefore, developing an environment-friendly sludge stabilizing and curing agent is a key to the popularization of sludge curing treatment technology.
Patent CN 107879569a discloses a novel organic-inorganic composite sludge curing agent, which is prepared from the following functional components in percentage by mass: 58.8-60.5% of cement, 19.4-21.5% of quicklime, 4.5-5.3% of potassium ferrate, 14.8-15.2% of high-molecular water-absorbent resin, and the sum of the percentages of all the functional components is 100%. The curing agent in the patent selects proper corresponding functional components from the angles of promoting cement hydration, setting and hardening, thinning an electric double layer, converting water and the like, and can be directly used as road roadbed filler after being stirred and maintained with silt, thereby realizing the recycling of the silt. But the problems therein are: in this patent, in order to reduce free water present in the sludge, a high molecular water absorbent resin is used to convert a large amount of free water in the sludge into hydration water and adsorption water, the high molecular water absorbent resin has a strong water holding capacity, and after water absorption, it exists in the form of gel, the strength of the hydrogel is low and the bonding effect with each component in the solidified sludge is weak, resulting in poor strength of the solidified sludge.
Disclosure of Invention
The application provides an environment-friendly sludge stabilizing curing agent and a preparation method thereof, wherein the sludge stabilizing curing agent can be used for curing sludge, improving the strength of the cured sludge, promoting the utilization of sludge resources and protecting the environment.
In a first aspect, the application provides an environment-friendly sludge stabilization curing agent, which comprises the following components in parts by mass: 50 parts of cement, 10-30 parts of modified fly ash, 15-30 parts of quicklime, 20-30 parts of active water absorbing material and 1-8 parts of potassium ferrate, wherein the modified fly ash is obtained by acid treatment of the fly ash, the active water absorbing material comprises silane crosslinked carboxymethyl chitosan, and the silane crosslinked carboxymethyl chitosan is obtained by co-crosslinking carboxymethyl chitosan, hydrophilic functional monomers and organosilicon.
According to the application, when the silt stabilizing and curing agent is used for curing silt, the strength of the cured silt can be effectively improved through the synergistic cooperation of the components, and the silt is converted into a geotechnical building material, wherein the active water absorbing material can effectively reduce the free water content in the silt, and has higher strength due to a crosslinking structure after absorbing water, and meanwhile, the active water absorbing material also has certain hydration reaction activity, can participate in hydration, and improves the linking effect of the active water absorbing material and a cured silt framework, so that the strength of the cured silt is effectively improved through cooperation of other components.
In some embodiments, the environment-friendly sludge stabilization curing agent comprises the following components in parts by mass: 50 parts of cement, 15-25 parts of modified fly ash, 20-30 parts of quicklime, 25-30 parts of active water absorbing material and 2-6 parts of potassium ferrate.
In some embodiments, the cement comprises at least one of portland cement, sulfate cement, aluminate cement.
In some embodiments, the preparation method of the modified fly ash specifically comprises the following steps:
Immersing the fly ash in sulfuric acid aqueous solution, and filtering and drying to obtain the modified fly ash.
In some embodiments, the method for preparing silane crosslinked carboxymethyl chitosan comprises the following steps:
s10: activating carboxymethyl chitosan under alkaline condition to obtain activated carboxymethyl chitosan water solution;
S20: mixing the activated carboxymethyl chitosan aqueous solution, a hydrophilic functional monomer and an organosilicon sol to obtain a mixed solution, and performing a crosslinking reaction under the action of an initiator and a crosslinking agent to obtain silane crosslinked carboxymethyl chitosan, wherein the hydrophilic functional monomer comprises at least one of acrylic acid, acrylamide, methacrylic acid and methacrylamide.
In some embodiments, the step S10 specifically includes: and adding carboxymethyl chitosan into 0.1-2 mol/L sodium hydroxide aqueous solution, activating for 30-60 min at 40-70 ℃ in nitrogen atmosphere, and adjusting the pH of the system to 3-6 to obtain an activated carboxymethyl chitosan aqueous solution.
In some embodiments, in the step S20, the mass ratio of the activated carboxymethyl chitosan to the hydrophilic functional monomer is 1: 4-6.
In some embodiments, the hydrophilic functional monomer is present in a molar ratio of 1: 2-3 of acrylic acid and acrylamide.
In some embodiments, in step S20, the mass percentage of the organic silicon in the mixed solution is 5% -15%.
In a second aspect, the present application provides a method for preparing an environmentally friendly sludge stabilization curing agent, comprising the steps of: the environment-friendly sludge stabilization curing agent is obtained by uniformly mixing the components of the environment-friendly sludge stabilization curing agent according to any one of the embodiments of the first aspect.
According to the application, the environment-friendly silt stabilizing and curing agent has no special preparation requirement, can be obtained by simple blending, does not need other procedures, is environment-friendly and low in cost, is suitable for industrial production and application, and comprises the components of the environment-friendly silt stabilizing and curing agent in any one of the embodiments of the first aspect, so that the environment-friendly silt stabilizing and curing agent has the beneficial effects of the first aspect.
Description of the embodiments
Each example or embodiment in this specification is described in a progressive manner, each example focusing on differences from other examples.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
As described in the background art above, in order to utilize sludge as a resource, it is necessary to provide a stable curing agent capable of effectively curing sludge, so that the cured sludge has higher strength, and meets the requirement of the engineering on strength, thereby being more beneficial to the resource utilization.
The key point is to solve the problems of high water content, high organic matter content, high clay content and the like of the sludge. Aiming at the problems, the prior art uses a curing agent composed of cement, quicklime, potassium ferrate and a high-molecular water-absorbing resin to cure the sludge, wherein the cement, the quicklime and clay particles in the sludge are hydrated to form a framework of the cured sludge, the potassium ferrate oxidizes and degrades organic matters in the sludge, and an electric double layer is thinned, so that the cement hydration reaction and the pozzolan reaction are promoted, and the high-molecular water-absorbing resin is used for absorbing free water in the sludge, so that a large amount of free water in the sludge is converted into hydration water and adsorbed water, the connection among the soil particles is increased, and the strength of the cured sludge is improved. The components cooperate to have a better effect of solidifying the sludge.
However, the inventors have found from the above analysis of the curing agent that the use of the polymer water absorbent resin in the curing agent can effectively reduce the free water content in the sludge, but has a problem in that the polymer water absorbent resin exists in the cured sludge in the form of gel after absorbing water, the strength is lower than that of the hydrate skeleton formed by hydration hardening, and the degree of bonding between the cement paste and the hydrate skeleton in the cured sludge is poor, thereby resulting in lower strength of the cured sludge.
Based on the above, the application provides an environment-friendly silt stabilizing curing agent which can effectively improve the strength of the cured silt. The environment-friendly sludge stabilizing and curing agent and the preparation method thereof provided by the application are described in detail below.
In a first aspect, the application provides an environment-friendly sludge stabilization curing agent, which comprises the following components in parts by mass: 50 parts of cement, 10-30 parts of modified fly ash, 15-30 parts of quicklime, 20-30 parts of active water absorbing material and 1-8 parts of potassium ferrate, wherein the modified fly ash is obtained by acid treatment of the fly ash, and the active water absorbing material comprises silane crosslinked carboxymethyl chitosan, and the silane crosslinked carboxymethyl chitosan is obtained by co-crosslinking carboxymethyl chitosan, hydrophilic functional monomers and organic silicon.
According to the application, the silt stabilizing and curing agent mainly comprises cement, modified fly ash, quicklime, an active water absorbing material and potassium ferrate, wherein cement, quicklime and water in silt undergo hydration hydrolysis reaction to form various cement hydrates, and the cement hydrates and clay particles in the silt can form a durable and high-strength stable framework structure through a series of chemical reactions and curing, so that the silt stabilizing and curing agent is a foundation of the silt stabilizing and curing agent. In the application, a certain amount of modified fly ash is used for replacing part of cement, the fly ash is the main solid waste discharged by coal-fired power plants, coal gangue and coal slime comprehensive utilization power plants, and the main components are oxides such as silicon dioxide, aluminum oxide, ferric oxide, calcium oxide, magnesium oxide and the like, wherein the active silicon dioxide can generate pozzolanic reaction, and the skeleton stability can be improved.
The modified fly ash is obtained by acid treatment of the fly ash, and mainly aims to remove metal oxides which are unfavorable to the solidified sludge, meanwhile, the specific surface area of the modified fly ash is further increased to form micropores, so that on one hand, the activity of the reaction is higher, on the other hand, the modified fly ash has stronger water absorption capacity, free water in the sludge is reduced, the free water can be transferred by being matched with an active water absorption material, the cement hydration is promoted, and the strength of the solidified sludge is improved.
The potassium ferrate has higher oxidizing property, can oxidize humus in the sludge, so that adverse effect of the humus on sludge solidification is reduced, and ferric hydroxide obtained by hydrolysis of the potassium ferrate has a certain adsorption and removal effect on the humus, and on the other hand, iron ions can effectively reduce the thickness of an electric double layer on the surface of clay particles, so that aggregation of the clay particles is promoted, and the strength of solidified sludge is improved.
The active water-absorbing material comprises silane crosslinked carboxymethyl chitosan, wherein the silane crosslinked carboxymethyl chitosan is obtained by co-crosslinking carboxymethyl chitosan, hydrophilic functional monomers and organic silicon, in order to enable the water-absorbing material to have reactivity, the organic silicon is copolymerized with the carboxymethyl chitosan, and because the organic silicon is poor in hydrophilicity, the hydrophilic functional monomers and the organic silicon are also added to carry out copolymerization crosslinking, so that the hydrophilicity of the silane crosslinked carboxymethyl chitosan is improved, the silane crosslinked carboxymethyl chitosan has better water absorbability besides reactivity, and is matched with other components in a stabilizing curing agent, the free water content in the sludge can be effectively reduced, the water-absorbing material becomes a gel state after water absorption, and due to a crosslinking structure, the gel strength is higher compared with that formed by common high molecular water-absorbing resin.
Therefore, the silt stabilizing curing agent provided by the application can effectively improve the strength of the cured silt through the synergistic effect of the components.
In some embodiments, the environment-friendly sludge stabilization curing agent comprises the following components in parts by mass: 50 parts of cement, 15-25 parts of modified fly ash, 20-30 parts of quicklime, 25-30 parts of active water absorbing material and 2-6 parts of potassium ferrate.
In some of the embodiments described above, the effect of stabilizing the curing agent to cure the sludge is better and the strength of the resulting cured sludge is higher.
In some embodiments, the cement comprises at least one of portland cement, sulfate cement, aluminate cement.
In some of the above embodiments, a few cements commonly used in the art are specifically listed, and a person skilled in the art may select the cements according to actual needs, and it should be noted that the cements are not limited to the above, and a person skilled in the art may select cements known in the art. As an example, the present application uses portland cement.
In some embodiments, the method for preparing the modified fly ash specifically comprises the following steps:
Immersing the fly ash in sulfuric acid aqueous solution, and filtering and drying to obtain the modified fly ash.
More specifically, as an example, the modified fly ash is prepared by: immersing pulverized coal ash in 0.5-2 mol/L sulfuric acid aqueous solution, stirring and reacting for 9-12 h at 20-30 ℃, filtering after the reaction is finished, collecting filter residues, washing the filter residues with water for 2-3 times, and finally drying the washed filter residues for 12-16 h at 100-120 ℃ to obtain the modified fly ash.
In some embodiments, a method of preparing silane crosslinked carboxymethyl chitosan comprises the steps of:
s10: activating carboxymethyl chitosan under alkaline condition to obtain activated carboxymethyl chitosan water solution;
S20: mixing the activated carboxymethyl chitosan aqueous solution, a hydrophilic functional monomer and an organosilicon sol to obtain a mixed solution, and performing a crosslinking reaction under the action of an initiator and a crosslinking agent to obtain silane crosslinked carboxymethyl chitosan, wherein the hydrophilic functional monomer comprises at least one of acrylic acid, acrylamide, methacrylic acid and methacrylamide.
In some embodiments, the preparation method of silane crosslinked carboxymethyl chitosan is specifically disclosed, and the silane crosslinked carboxymethyl chitosan is prepared by firstly activating carboxymethyl chitosan and then crosslinking the carboxymethyl chitosan, hydrophilic functional monomers and organosilicon sol under the conditions of an initiator and a crosslinking agent. The silane crosslinked carboxymethyl chitosan with higher strength is formed by in-situ polymerization crosslinking, wherein hydrophilic functional monomers are branched and connected on the carboxymethyl chitosan through free radical reaction, and organosilicon can be condensed with carboxyl on one hand and crosslinked with the two through a large number of hydrogen bonds on the other hand. The silane crosslinked carboxymethyl chitosan has better water absorption performance, can effectively cooperate with other components in the stabilizing curing agent to reduce the content of free water, has higher strength due to higher crosslinking density, and has better bonding effect with a hard-setting framework in the cured sludge through chemical bond effect. The strength of the solidified sludge can be further improved.
Meanwhile, the silane crosslinked carboxymethyl chitosan can be prepared by adjusting the proportion of each raw material and the hydrophilia according to the water content of different sludge, and has higher designability.
In some of the above embodiments, the kind of the silicone is not limited, and those skilled in the art can select the silicone known in the art according to actual needs. As an example, the silicone is tetraethoxysilane and the silicone sol is obtainable by the following method: adding a certain amount of deionized water into tetraethoxysilane, adjusting the pH to 3-4 by using hydrochloric acid, and stirring for 2-3 hours to obtain the organic silica sol.
In some embodiments, the mass percentage of the initiator in the mixed solution is 1-5%, and the mass percentage of the cross-linking agent in the mixed solution is 0.1-0.5%.
In some of the above embodiments, the kinds of the initiator and the crosslinking agent are not limited, and those skilled in the art can select the initiator and the crosslinking agent known in the art according to actual needs. As one example, the initiator is potassium persulfate; the cross-linking agent is N, N' -methylene bisacrylamide.
In some embodiments, step S10 specifically includes: and adding carboxymethyl chitosan into 0.1-2 mol/L sodium hydroxide aqueous solution, activating for 30-60 min at 40-70 ℃ in nitrogen atmosphere, and adjusting the pH of the system to 3-6 to obtain an activated carboxymethyl chitosan aqueous solution.
In some embodiments, the mass dispersion of the activated carboxymethyl chitosan aqueous solution is 3% -10%.
In some embodiments, in step S20, the mass ratio of activated carboxymethyl chitosan to hydrophilic functional monomer is 1: 4-6.
In some of the above embodiments, the mass ratio of the activated carboxymethyl chitosan to the hydrophilic functional monomer is specifically defined, the mass ratio has a certain influence on the water absorption and the crosslinking density of the silane crosslinked carboxymethyl chitosan, and the mass ratio of the activated carboxymethyl chitosan to the hydrophilic functional monomer is 1: 4-6, the obtained silane crosslinked carboxymethyl chitosan has good water absorbability and crosslinking density, and further the strength of the solidified sludge is higher.
In some embodiments, the hydrophilic functional monomer is present in a molar ratio of 1: 2-3 of acrylic acid and acrylamide.
In some of the above embodiments, the hydrophilic functional monomer is specifically defined as having a molar ratio of 1: 2-3 of acrylic acid and acrylamide. The inventor finds that the water is needed for hydration reaction of cement, fly ash and quicklime and volcanic ash reaction, and the active water-absorbing material has high crosslinking density, so that the water-retaining capacity is high, namely, the water in silane crosslinked carboxymethyl chitosan is difficult to transfer, and the water can adversely affect cement hydration.
Through a large number of experiments, the hydrophilic functional monomers are found to have a molar ratio of 1: 2-3, the obtained silane crosslinked carboxymethyl chitosan has better water absorption and relatively weaker water retention capacity, so that after the water absorption, the water combined by the silane crosslinked carboxymethyl chitosan can be transferred along with the progress of hydration reaction, and the cement hydration is promoted, so that the strength of the obtained solidified sludge is higher.
In some embodiments, in step S20, the mass percentage of the organic silicon in the mixed solution is 5% -15%. The silane crosslinked carboxymethyl chitosan obtained at the moment has good water absorbability and crosslinking density, and can effectively improve the strength of the solidified sludge.
In some embodiments, in step S20, the crosslinking reaction conditions are that the reaction is performed for 2 to 4 hours at 50 to 70 ℃ under nitrogen atmosphere.
In some embodiments, in step S20, the reaction product is washed and dried after the crosslinking is completed to obtain silane crosslinked carboxymethyl chitosan.
In a second aspect, the present application provides a method for preparing an environmentally friendly sludge stabilization curing agent, comprising the steps of: and uniformly mixing the components of the environment-friendly sludge stabilizing and curing agent according to any embodiment of the first aspect to obtain the environment-friendly sludge stabilizing and curing agent.
According to the application, the environment-friendly sludge stabilization curing agent has no special preparation requirement, can be obtained by simple blending, does not need other procedures, is environment-friendly and low in cost, is suitable for industrial production and application, and comprises the components of the environment-friendly sludge stabilization curing agent of any one of the embodiments of the first aspect, so that the environment-friendly sludge stabilization curing agent has the beneficial effects of the first aspect.
The present disclosure is more particularly described in the following examples that are intended as illustrations only, since various modifications and changes within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages, and ratios reported in the examples below are on a mass basis, and all reagents used in the examples are commercially available or were obtained synthetically according to conventional methods and can be used directly without further treatment, as well as the instruments used in the examples.
Example 1
Preparation of an environment-friendly silt stabilizing and curing agent:
50 parts of silicate cement, 20 parts of modified fly ash, 25 parts of quicklime, 27 parts of silane crosslinked carboxymethyl chitosan and 5 parts of potassium ferrate are uniformly mixed to obtain the environment-friendly sludge stabilizing curing agent.
The preparation method of the modified fly ash comprises the following steps: immersing pulverized coal ash in 1.5mol/L sulfuric acid water solution, stirring at 25 ℃ for reaction for 12 hours, filtering after the reaction is finished, collecting filter residues, washing the filter residues with water for 3 times, and finally drying the washed filter residues at 120 ℃ for 12 hours to obtain the modified fly ash.
The preparation method of the silane crosslinked carboxymethyl chitosan comprises the following steps: adding carboxymethyl chitosan into 1mol/L sodium hydroxide aqueous solution, activating for 30min at 60 ℃ in nitrogen atmosphere, and then regulating the pH value of the system to 5 to obtain an activated carboxymethyl chitosan aqueous solution, wherein the concentration of the activated carboxymethyl chitosan aqueous solution is 5%;
adding hydrophilic functional monomer, tetraethoxysilane sol, potassium persulfate and N, N' -methylene bisacrylamide into an activated carboxymethyl chitosan aqueous solution to obtain a mixed solution, carrying out crosslinking reaction on the mixed solution at 60 ℃ for 2 hours under a nitrogen atmosphere, and washing and drying a product to obtain the silane crosslinked carboxymethyl chitosan.
Wherein, in the mixed solution, the mass ratio of the activated carboxymethyl chitosan to the hydrophilic functional monomer is 1:5, the mass ratio of the hydrophilic functional monomer is 1:2.5 mixing acrylic acid and acrylamide, wherein the mass percent of tetraethoxysilane is 9%, the mass percent of potassium persulfate in the mixed solution is 1%, and the mass percent of N, N' -methyl bisacrylamide in the mixed solution is 0.1%.
Example 2
Preparation of an environment-friendly silt stabilizing and curing agent:
50 parts of silicate cement, 20 parts of modified fly ash, 25 parts of quicklime, 27 parts of silane crosslinked carboxymethyl chitosan and 5 parts of potassium ferrate are uniformly mixed to obtain the environment-friendly sludge stabilizing curing agent.
The preparation method of the modified fly ash comprises the following steps: immersing pulverized coal ash in 1.5mol/L sulfuric acid water solution, stirring at 25 ℃ for reaction for 12 hours, filtering after the reaction is finished, collecting filter residues, washing the filter residues with water for 3 times, and finally drying the washed filter residues at 120 ℃ for 12 hours to obtain the modified fly ash.
The preparation method of the silane crosslinked carboxymethyl chitosan comprises the following steps: adding carboxymethyl chitosan into 1mol/L sodium hydroxide aqueous solution, activating for 30min at 60 ℃ in nitrogen atmosphere, and then regulating the pH value of the system to 5 to obtain an activated carboxymethyl chitosan aqueous solution, wherein the concentration of the activated carboxymethyl chitosan aqueous solution is 5%;
adding hydrophilic functional monomer, tetraethoxysilane sol, potassium persulfate and N, N' -methylene bisacrylamide into an activated carboxymethyl chitosan aqueous solution to obtain a mixed solution, carrying out crosslinking reaction on the mixed solution at 60 ℃ for 2 hours under a nitrogen atmosphere, and washing and drying a product to obtain the silane crosslinked carboxymethyl chitosan.
Wherein, in the mixed solution, the mass ratio of the activated carboxymethyl chitosan to the hydrophilic functional monomer is 1:5, the hydrophilic functional monomer is acrylic acid, the mass percentage of tetraethoxysilane is 9%, the mass percentage of potassium persulfate in the mixed solution is 1%, and the mass percentage of N, N' -methyl bisacrylamide in the mixed solution is 0.1%.
Example 3
Preparation of an environment-friendly silt stabilizing and curing agent:
50 parts of silicate cement, 20 parts of modified fly ash, 25 parts of quicklime, 27 parts of silane crosslinked carboxymethyl chitosan and 5 parts of potassium ferrate are uniformly mixed to obtain the environment-friendly sludge stabilizing curing agent.
The preparation method of the modified fly ash comprises the following steps: immersing pulverized coal ash in 1.5mol/L sulfuric acid water solution, stirring at 25 ℃ for reaction for 12 hours, filtering after the reaction is finished, collecting filter residues, washing the filter residues with water for 3 times, and finally drying the washed filter residues at 120 ℃ for 12 hours to obtain the modified fly ash.
The preparation method of the silane crosslinked carboxymethyl chitosan comprises the following steps: adding carboxymethyl chitosan into 1mol/L sodium hydroxide aqueous solution, activating for 30min at 60 ℃ in nitrogen atmosphere, and then regulating the pH value of the system to 5 to obtain an activated carboxymethyl chitosan aqueous solution, wherein the concentration of the activated carboxymethyl chitosan aqueous solution is 5%;
adding hydrophilic functional monomer, tetraethoxysilane sol, potassium persulfate and N, N' -methylene bisacrylamide into an activated carboxymethyl chitosan aqueous solution to obtain a mixed solution, carrying out crosslinking reaction on the mixed solution at 60 ℃ for 2 hours under a nitrogen atmosphere, and washing and drying a product to obtain the silane crosslinked carboxymethyl chitosan.
Wherein, in the mixed solution, the mass ratio of the activated carboxymethyl chitosan to the hydrophilic functional monomer is 1:5, the hydrophilic functional monomer is acrylamide, the mass percentage of tetraethoxysilane is 9%, the mass percentage of potassium persulfate in the mixed solution is 1%, and the mass percentage of N, N' -methyl bisacrylamide in the mixed solution is 0.1%.
Example 4
Preparation of an environment-friendly silt stabilizing and curing agent:
50 parts of silicate cement, 20 parts of modified fly ash, 25 parts of quicklime, 27 parts of silane crosslinked carboxymethyl chitosan and 5 parts of potassium ferrate are uniformly mixed to obtain the environment-friendly sludge stabilizing curing agent.
The preparation method of the modified fly ash comprises the following steps: immersing pulverized coal ash in 1.5mol/L sulfuric acid water solution, stirring at 25 ℃ for reaction for 12 hours, filtering after the reaction is finished, collecting filter residues, washing the filter residues with water for 3 times, and finally drying the washed filter residues at 120 ℃ for 12 hours to obtain the modified fly ash.
The preparation method of the silane crosslinked carboxymethyl chitosan comprises the following steps: adding carboxymethyl chitosan into 1mol/L sodium hydroxide aqueous solution, activating for 30min at 60 ℃ in nitrogen atmosphere, and then regulating the pH value of the system to 5 to obtain an activated carboxymethyl chitosan aqueous solution, wherein the concentration of the activated carboxymethyl chitosan aqueous solution is 5%;
adding hydrophilic functional monomer, tetraethoxysilane sol, potassium persulfate and N, N' -methylene bisacrylamide into an activated carboxymethyl chitosan aqueous solution to obtain a mixed solution, carrying out crosslinking reaction on the mixed solution at 60 ℃ for 2 hours under a nitrogen atmosphere, and washing and drying a product to obtain the silane crosslinked carboxymethyl chitosan.
Wherein, in the mixed solution, the mass ratio of the activated carboxymethyl chitosan to the hydrophilic functional monomer is 1:5, hydrophilic functional monomer is 1:1, wherein the mass percent of tetraethoxysilane is 9%, the mass percent of potassium persulfate in the mixed solution is 1%, and the mass percent of N, N' -methyl bisacrylamide in the mixed solution is 0.1%.
Example 5
Preparation of an environment-friendly silt stabilizing and curing agent:
50 parts of silicate cement, 20 parts of modified fly ash, 25 parts of quicklime, 27 parts of silane crosslinked carboxymethyl chitosan and 5 parts of potassium ferrate are uniformly mixed to obtain the environment-friendly sludge stabilizing curing agent.
The preparation method of the modified fly ash comprises the following steps: immersing pulverized coal ash in 1.5mol/L sulfuric acid water solution, stirring at 25 ℃ for reaction for 12 hours, filtering after the reaction is finished, collecting filter residues, washing the filter residues with water for 3 times, and finally drying the washed filter residues at 120 ℃ for 12 hours to obtain the modified fly ash.
The preparation method of the silane crosslinked carboxymethyl chitosan comprises the following steps: adding carboxymethyl chitosan into 1mol/L sodium hydroxide aqueous solution, activating for 30min at 60 ℃ in nitrogen atmosphere, and then regulating the pH value of the system to 5 to obtain an activated carboxymethyl chitosan aqueous solution, wherein the concentration of the activated carboxymethyl chitosan aqueous solution is 5%;
adding hydrophilic functional monomer, tetraethoxysilane sol, potassium persulfate and N, N' -methylene bisacrylamide into an activated carboxymethyl chitosan aqueous solution to obtain a mixed solution, carrying out crosslinking reaction on the mixed solution at 60 ℃ for 2 hours under a nitrogen atmosphere, and washing and drying a product to obtain the silane crosslinked carboxymethyl chitosan.
Wherein, in the mixed solution, the mass ratio of the activated carboxymethyl chitosan to the hydrophilic functional monomer is 1:3, the mass ratio of the hydrophilic functional monomer is 1:2.5 mixing acrylic acid and acrylamide, wherein the mass percent of tetraethoxysilane is 9%, the mass percent of potassium persulfate in the mixed solution is 1%, and the mass percent of N, N' -methyl bisacrylamide in the mixed solution is 0.1%.
Comparative example 1
Preparation of an environment-friendly silt stabilizing and curing agent:
50 parts of silicate cement, 20 parts of modified fly ash, 25 parts of quicklime, 27 parts of carboxymethyl chitosan and 5 parts of potassium ferrate are uniformly mixed to obtain the environment-friendly sludge stabilizing and curing agent.
The preparation method of the modified fly ash comprises the following steps: immersing pulverized coal ash in 1.5mol/L sulfuric acid water solution, stirring at 25 ℃ for reaction for 12 hours, filtering after the reaction is finished, collecting filter residues, washing the filter residues with water for 3 times, and finally drying the washed filter residues at 120 ℃ for 12 hours to obtain the modified fly ash.
Test part:
The sludge (the water content is 58%) of a certain domestic city is adopted, the environment-friendly sludge stabilizing and solidifying agent to be detected is doped according to 9% of the mass of the sludge, and the sludge is stirred uniformly and then stands for 24 hours, so that the sludge and the stabilizing and solidifying agent are ensured to fully react, and the solidified sludge is obtained. And (3) constructing the solidified sludge according to a conventional engineering implementation method of solidifying agent reinforced soil by referring to soil solidifying agent application technical standard CJJ/T286-2018, and performing an unconfined compressive strength test, a direct shear test and a bearing ratio test on the solidified sludge by referring to geotechnical test method standard (GBT 50123-2019). The results are shown in Table 1.
TABLE 1
According to the results of table 1, the compressive strength, shear strength and CBR values of the cured sludge of each example were higher than those of comparative example 1, because the silane-crosslinked carboxymethyl chitosan absorbed water to form a gel having a higher strength than that of carboxymethyl chitosan alone, and the active silica groups in the silane-crosslinked carboxymethyl chitosan allowed pozzolanic reaction to occur, thus bonding with the skeleton formed by the hydration product and clay particles of the cured sludge was tighter, and thus the mechanical properties of the cured sludge obtained by each example were better. The stable curing agent provided by the application can be used for effectively curing the sludge, is applied to civil engineering, and is recycled, so that the environment-friendly industrial requirement is met.
In addition, the mechanical properties of the cured sludge of each embodiment are also different, because the proportion of the silane crosslinked carboxymethyl chitosan synthetic raw material has a certain influence on the properties thereof, such as the proportion of carboxymethyl chitosan and hydrophilic functional monomer, the types and proportions of hydrophilic functional monomers, and the like, and the possible reasons for influencing the curing are described above and are not repeated herein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (5)
1. An environment-friendly silt stabilizing and curing agent is characterized by comprising the following components in parts by mass:
50 parts of cement, 10-30 parts of modified fly ash, 15-30 parts of quicklime, 20-30 parts of active water absorbing material, 1-8 parts of potassium ferrate,
Wherein the modified fly ash is obtained by acid treatment of fly ash,
The active water absorbing material comprises silane crosslinked carboxymethyl chitosan, and the preparation method of the silane crosslinked carboxymethyl chitosan comprises the following steps:
S10: adding carboxymethyl chitosan into 0.1-2 mol/L sodium hydroxide aqueous solution, activating for 30-60 min at 40-70 ℃ in nitrogen atmosphere, and then adjusting the pH of the system to 3-6 to obtain an activated carboxymethyl chitosan aqueous solution;
S20: mixing the activated carboxymethyl chitosan aqueous solution, the hydrophilic functional monomer and the organic silica sol to obtain a mixed solution, and performing a crosslinking reaction under the action of an initiator and a crosslinking agent to obtain silane crosslinked carboxymethyl chitosan, wherein the mass ratio of the activated carboxymethyl chitosan to the hydrophilic functional monomer is 1: 4-6, wherein the hydrophilic functional monomer is prepared from the following components in a molar ratio of 1: 2-3, namely mixing acrylic acid and acrylamide, wherein the organic silica sol is obtained by the following method: adding a certain amount of deionized water into tetraethoxysilane, adjusting the pH to 3-4 by using hydrochloric acid, and stirring for 2-3 hours to obtain an organosilicon sol; the mass percentage of tetraethoxysilane in the mixed solution is 5% -15%.
2. The environment-friendly sludge stabilization curing agent according to claim 1, which is characterized by comprising the following components in parts by mass:
50 parts of cement, 15-25 parts of modified fly ash, 20-30 parts of quicklime, 25-30 parts of active water absorbing material and 2-6 parts of potassium ferrate.
3. The environmentally friendly sludge stabilization curing agent of claim 1 wherein the cement comprises at least one of portland cement, sulfate cement, aluminate cement.
4. The environment-friendly silt stabilizing and curing agent according to claim 1, wherein the preparation method of the modified fly ash comprises the following steps:
Immersing the fly ash in sulfuric acid aqueous solution, and filtering and drying to obtain the modified fly ash.
5. The preparation method of the environment-friendly silt stabilizing and curing agent is characterized by comprising the following steps of: the environment-friendly sludge stabilization curing agent is obtained by uniformly mixing the components of the environment-friendly sludge stabilization curing agent according to any one of claims 1 to 4.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5556915A (en) * | 1991-12-20 | 1996-09-17 | Toyo Ink Manufacturing Co., Ltd. | Water-based organosilicon composition |
| CN101925451A (en) * | 2008-01-23 | 2010-12-22 | 诺瓦提斯公司 | Method for coating silicone hydrogels |
| JP2011012089A (en) * | 2009-06-01 | 2011-01-20 | Planet Company:Kk | Modifier of aqueous detergent solution, modified aqueous detergent, and method for producing the same |
| CN104512994A (en) * | 2014-12-16 | 2015-04-15 | 北京高能时代环境技术股份有限公司 | Curing agent for sludge solidification and stabilization and preparation and application thereof |
| CN107879569A (en) * | 2017-10-25 | 2018-04-06 | 中国地质大学（武汉） | A kind of new organo-mineral complexing sludge curing agent and its application method and application |
| CN108729214A (en) * | 2018-07-10 | 2018-11-02 | 长沙浩然医疗科技有限公司 | A kind of antibacterial high-hydroscopicity burlap and preparation method thereof |
| CN110615585A (en) * | 2019-09-20 | 2019-12-27 | 麻城市众创科技有限公司 | Sludge curing agent and application method thereof |
| CN111410716A (en) * | 2020-04-24 | 2020-07-14 | 夏克春 | High-strength modified acrylic acid-based degradable hydrogel and preparation method thereof |
| WO2022085755A1 (en) * | 2020-10-21 | 2022-04-28 | 株式会社日本触媒 | Water-absorbable resin composition |
| CN115304331A (en) * | 2022-08-26 | 2022-11-08 | 武汉轻工大学 | Environment-friendly composite industrial waste solidified sludge and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3089115B1 (en) * | 2018-11-30 | 2020-11-20 | Nvd | BIOCOMPATIBLE HYDROGEL, METHOD OF PREPARATION AND USE IN A MECHANICAL VISCO-SUPPLEMENTATION SYSTEM |
-
2023
- 2023-05-29 CN CN202310614244.8A patent/CN116768435B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5556915A (en) * | 1991-12-20 | 1996-09-17 | Toyo Ink Manufacturing Co., Ltd. | Water-based organosilicon composition |
| CN101925451A (en) * | 2008-01-23 | 2010-12-22 | 诺瓦提斯公司 | Method for coating silicone hydrogels |
| JP2011012089A (en) * | 2009-06-01 | 2011-01-20 | Planet Company:Kk | Modifier of aqueous detergent solution, modified aqueous detergent, and method for producing the same |
| CN104512994A (en) * | 2014-12-16 | 2015-04-15 | 北京高能时代环境技术股份有限公司 | Curing agent for sludge solidification and stabilization and preparation and application thereof |
| CN107879569A (en) * | 2017-10-25 | 2018-04-06 | 中国地质大学（武汉） | A kind of new organo-mineral complexing sludge curing agent and its application method and application |
| CN108729214A (en) * | 2018-07-10 | 2018-11-02 | 长沙浩然医疗科技有限公司 | A kind of antibacterial high-hydroscopicity burlap and preparation method thereof |
| CN110615585A (en) * | 2019-09-20 | 2019-12-27 | 麻城市众创科技有限公司 | Sludge curing agent and application method thereof |
| CN111410716A (en) * | 2020-04-24 | 2020-07-14 | 夏克春 | High-strength modified acrylic acid-based degradable hydrogel and preparation method thereof |
| WO2022085755A1 (en) * | 2020-10-21 | 2022-04-28 | 株式会社日本触媒 | Water-absorbable resin composition |
| CN115304331A (en) * | 2022-08-26 | 2022-11-08 | 武汉轻工大学 | Environment-friendly composite industrial waste solidified sludge and preparation method thereof |
Non-Patent Citations (6)
| Title |
|---|
| Aluminum nanoparticles, chitosan, acrylic acid and vinyltrimethoxysilane based hybrid hydrogel as a remarkable water super-absorbent and antimicrobial activity;Mehvish Tanveer et al.;Surfaces and Interface;第25卷;摘要、第2页第1节、第2.2节 * |
| 不同取代位点羧甲基壳聚糖高吸水性树脂的制备及其性能;方士鑫等;青岛科技大学学报;第41卷(第4期);第82-87页 * |
| 几种因素对葵花秸秆髓制备高吸水树脂的研究;冯志鑫;商平;刘美荣;蔡旭艳;李梦;;化工科技;20090615(03);第5-8页 * |
| 吴正直等.粉煤灰综合利用.中国建材工业出版社,2013,第427页. * |
| 改性聚天冬氨酸聚( 丙烯酸-丙烯酰胺) 互穿网络吸水性树脂的制备及表征;胡灯等;高分子材料科学与工程;第32卷(第10期);第30-35页 * |
| 有机硅改性常温自交联丙烯酸乳液合成研究;陈衍华;黄朝;沈航;谌开红;;福建建材;20081215(06);第20-22页 * |
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