CN110922148A - Light wallboard prepared from phosphate tailings and slag sulfate cement and preparation method thereof - Google Patents
Light wallboard prepared from phosphate tailings and slag sulfate cement and preparation method thereof Download PDFInfo
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- CN110922148A CN110922148A CN201911092144.3A CN201911092144A CN110922148A CN 110922148 A CN110922148 A CN 110922148A CN 201911092144 A CN201911092144 A CN 201911092144A CN 110922148 A CN110922148 A CN 110922148A
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- slag
- cement
- lime
- gypsum
- phosphate tailings
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- 239000002893 slag Substances 0.000 title claims abstract description 75
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 title claims abstract description 41
- 239000004568 cement Substances 0.000 title claims abstract description 40
- 229910019142 PO4 Inorganic materials 0.000 title claims abstract description 38
- 239000010452 phosphate Substances 0.000 title claims abstract description 38
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000011574 phosphorus Substances 0.000 claims abstract description 44
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 44
- 239000010440 gypsum Substances 0.000 claims abstract description 35
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 35
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 31
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 31
- 239000004571 lime Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 30
- 239000002131 composite material Substances 0.000 claims abstract description 21
- 239000010451 perlite Substances 0.000 claims abstract description 21
- 235000019362 perlite Nutrition 0.000 claims abstract description 21
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000003469 silicate cement Substances 0.000 claims abstract description 6
- 238000000227 grinding Methods 0.000 claims abstract description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 20
- 239000011398 Portland cement Substances 0.000 claims description 18
- 239000000292 calcium oxide Substances 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000004033 plastic Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 150000004683 dihydrates Chemical class 0.000 claims description 5
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 230000032683 aging Effects 0.000 claims description 3
- 238000000498 ball milling Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 230000002285 radioactive effect Effects 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000012752 auxiliary agent Substances 0.000 claims description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 2
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 2
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- 230000005284 excitation Effects 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 229910021653 sulphate ion Inorganic materials 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000004576 sand Substances 0.000 abstract description 4
- 238000003825 pressing Methods 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract 1
- 239000002367 phosphate rock Substances 0.000 abstract 1
- 235000012255 calcium oxide Nutrition 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 6
- 239000000920 calcium hydroxide Substances 0.000 description 6
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 239000010881 fly ash Substances 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- 210000004127 vitreous body Anatomy 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- MKTRXTLKNXLULX-UHFFFAOYSA-P pentacalcium;dioxido(oxo)silane;hydron;tetrahydrate Chemical compound [H+].[H+].O.O.O.O.[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O MKTRXTLKNXLULX-UHFFFAOYSA-P 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000009412 basement excavation Methods 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
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a light wallboard prepared by utilizing phosphate tailings and slag sulfate cement and a method thereof, wherein the raw material of the light wallboard comprises a cementing material and water, the cementing material consists of slag sulfate cement, composite silicate cement, phosphate tailings, expanded perlite and water, the slag sulfate cement is prepared by grinding phosphorus slag, lime and gypsum and then uniformly mixing the ground phosphorus slag, lime and gypsum with anhydrous sodium sulfate, the invention uses novel ecological low-energy-consumption cementing material prepared from phosphorus slag, lime, gypsum and anhydrous sodium sulfate in proper proportion, namely slag sulfate type cement as cementing material, phosphate rock tailing sand as fine aggregate and expanded perlite as coarse aggregate, and adds proper amount of water, pressing into a mold under normal pressure, curing by standard or normal pressure steam to obtain a product meeting the actual requirement, compared with the prior light wallboard technical scheme, the light wallboard has very obvious economic and social benefits.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to a light wallboard prepared from phosphate tailings and slag sulfate cement and a method thereof.
Background
Due to the rapid development of the national mining industry, a large amount of various tailings with low additional attribute values are generated, and because the utilization rate is low, the tailings are mostly stacked in mountains and river channels, occupy land and pollute the environment, even can cause land loss, can cause major accidents in severe cases, and cause major losses to lives and properties of people. After 2007, the nation encouraged various regions to produce new wall materials from solid waste.
At present, fly ash and river sand are mainly used for producing light wall boards in China, but the fly ash and the river sand become very short with the expansion of production scale. In some areas, fly ash has become a scarce resource; in addition, in recent years, the environmental protection is regulated, the mining and excavation of rivers are forbidden everywhere, the price of natural river sand rises greatly, and the quality is reduced. The method for producing the wall material by using the phosphorus tailings and the phosphorus slag is an effective way for comprehensively utilizing resources in China, has the advantages of low relative cost, high resource utilization efficiency, energy conservation, soil conservation, waste utilization, environmental protection and remarkable social benefit.
The invention uses phosphorus slag, lime, gypsum, excitant and the like to prepare slag portland cement as a main cementing material, uses phosphorus tailings as a main filling material, fills expanded perlite as coarse aggregate into a wall body, and is specially maintained to form the lightweight wallboard with heat preservation and insulation functions.
Disclosure of Invention
The invention aims to provide a light wallboard prepared from phosphorus tailings and slag sulfate cement and a method thereof, wherein a large amount of tailings are utilized, so that the light wallboard has excellent heat preservation performance and higher flexural and compressive strength.
In order to achieve the purpose, the invention provides the following technical scheme:
the light wallboard is prepared by utilizing phosphate tailings and slag sulfate cement, raw materials of the light wallboard comprise cementing materials and water, the cementing materials comprise slag sulfate cement, composite silicate cement, phosphate tailings, expanded perlite and water, and the cementing materials account for the following components in percentage by mass: 20-50% of slag sulfate cement, 0-5% of composite portland cement, 3-5% of expanded perlite and the balance of phosphate tailings, wherein the total mass of the slag sulfate cement, the composite portland cement and the expanded perlite meets 100%; water accounts for 20-30% of the mass of the cementing material;
the slag sulfate cement is prepared by grinding phosphorus slag, lime and gypsum and then uniformly mixing the ground phosphorus slag, lime and gypsum with anhydrous sodium sulfate, wherein the slag sulfate cement comprises the following components in percentage by mass: 50-70% of phosphorus slag, 0-20% of gypsum, 1-3.5% of anhydrous sodium sulfate and the balance of lime, wherein the total mass of the materials is 100%.
In the invention, the phosphate tailing non-radioactive A-type product does not contain harmful substances to human bodies, and the main component of the phosphate tailing non-radioactive A-type product is CaMg (CO)3)2And SiO2。
In the invention, the phosphorous slag does not contain harmful substances to human bodies, the CaO content is more than or equal to 40 percent, and the SiO content is2The content is more than or equal to 30 percent.
In the invention, the content of CaO in the lime is more than or equal to 60 percent, the content of MgO is less than or equal to 5 percent, the content of over-burnt lime is not more than 5 percent of CaO, and the content of under-burnt lime is less than 7 percent.
In the invention, the gypsum is any one of phosphogypsum, desulfurized gypsum, fluorgypsum, natural anhydrite or natural dihydrate gypsum.
In the invention, the anhydrous sodium sulfate is an excitation auxiliary agent, and the mixing amount of the anhydrous sodium sulfate is determined according to the mixing amount of the phosphorous slag.
In the invention, the expanded perlite is a system light framework and conforms to the heat conductivity coefficient regulation of JC209 expanded perlite.
In the invention, the composite portland cement has a strength grade of 42.5, and related requirements meet GB/T175 general portland cement.
In the invention, the water is used for mixing common light wall boards.
The invention provides a method for preparing a light wallboard by using phosphate tailings and slag sulfate cement, which comprises the following specific steps:
(1) drying the phosphate tailings, sieving the phosphate tailings by a 0.3mm sieve, and taking the sieved part as a raw material; drying the phosphorus slag and the lime, and placing the phosphorus slag and the lime in a dry place for later use;
(2) respectively ball-milling the phosphorus slag, the lime and the gypsum treated in the step (1), and grinding the phosphorus slag treated in the step (1) to 350-400m3The lime is ground to the fineness of less than 20 percent, the gypsum is ground to 200 meshes, and the dry powder needs to be sealed for storage and is not easy to expose in the air;
(3) respectively metering the raw materials according to the proportion;
(4) deducting the amount of the metered composite silicate cement, halving the amount of water, putting the rest water and materials in a stirrer, and stirring for 3-5min until the mixture is uniform to obtain a mixture;
(5) packaging the prepared mixture in a plastic bag, placing the plastic bag in an environment with the temperature of 20 ℃ (the plastic bag can be placed in a heat-preservation foam box with a bulb in winter), and aging for 24 hours;
(6) taking out the aged batch obtained in the step (5), adding the composite portland cement and the rest water, and continuously putting the mixture into an internal stirrer for stirring; in the stirring process, the batch materials sinking at the bottom are turned over at intervals, so that the batch materials are mixed more uniformly;
(7) weighing the batch mixture obtained in the step (6), pouring the batch mixture into a steel mould, vibrating the batch mixture on a vibrating table for 15s, and demoulding to take out a plate;
(8) putting the plate obtained in the step (7) into a maintenance box, and carefully colliding the plate when the plate is put into the maintenance box to prevent the plate from being damaged as much as possible; precuring for 2-3 days in a steam curing environment at 90 ℃, then putting the cured plate into a still kettle, performing steam curing for 8 hours at 174.5 ℃, cooling to room temperature, and taking out to obtain a cured light wallboard;
(9) and (4) detecting the appearance quality, water absorption, porosity, apparent density, mechanical property and thermal property of the cured light wallboard.
Compared with other technologies, the invention has the advantages that:
a light-weight wall board is prepared from phosphorus tailings, lime, gypsum and anhydrous sodium sulfate through proportionally preparing the slag sulfate type cement as cementing material, the phosphate ore tailings as fine aggregate, expanded pearlite as coarse aggregate, adding water, pressing under ordinary pressure to obtain needed product, and steam curing.
The principle can be briefly described as follows: the alumina-silica glass body in the phosphorus slag has low hydration activity and is difficult to react with calcium hydroxide at normal temperature. At the beginning of the system, lime reacts with water to generate calcium hydroxide and a large amount of heat, and an aggregation structure formed by calcium hydroxide colloidal particles is converted into a crystal structure to form a framework with initial strength before autoclaved curing; at the moment, the anhydrous sodium sulfate erodes the vitreous body of the phosphorous slag, so that alumina and silica in the vitreous body are dissolved out to generate hydrated calcium silicate or hydrated calcium aluminate together with calcium hydroxide, further the strength of the product is improved, simultaneously, sulfate can react with the calcium hydroxide to generate nascent gypsum and sodium hydroxide, the sodium hydroxide can erode the vitreous body, and the gypsum and the generated gypsum in the system can generate ettringite together with the hydration product of the phosphorous slag, thereby promoting the improvement of the strength. Under the reasonable mixing proportion, the system normally runs to form an initial blank with certain strength.
The mineral composition of the phosphate tailings is dolomite and quartz, which are inactive at normal temperature, but under high-temperature and high-pressure maintenance, silicon dioxide and calcium oxide react to generate tobermorite with higher strength, and finally various unhydrated particles, ettringite, single alkali hydrate CSH (I), C-S-H gel, calcium hydroxide and tobermorite are contained in the whole system, and the expanded perlite particles are wrapped by the particles to form the heat-insulating light wallboard.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
In embodiment 1 of the invention, a method for preparing a light wallboard by using phosphate tailings and slag sulfate cement comprises the following raw materials in percentage by mass: 45% of slag sulfate cement, 0% of composite portland cement, 50% of phosphate tailings, 5% of expanded perlite and 25% of water in mass of the total cementing material;
the slag sulfate cement comprises 68% of phosphorus slag, 20% of lime, 10% of gypsum and 2% of anhydrous sodium sulfate by mass.
The phosphorus tailings and phosphorus slag production places are Yunnan phosphorus ore plants, gypsum is dihydrate gypsum, lime is quicklime produced by a glittering and translucent micro powder plant, composite portland cement, anhydrous sodium sulfate and expanded perlite are all commercially available, and mixing water is tap water.
The preparation method of the light wallboard comprises the following process flows:
1) drying the phosphate tailings, sieving the phosphate tailings by a 0.3mm sieve, and taking the sieved part as a raw material;
2) drying the phosphorus slag and the lime, respectively carrying out ball milling on the phosphorus slag, the lime and the gypsum until the phosphorus slag is milled to 350-3The lime is ground to the fineness of less than 20 percent, the gypsum is ground to 200 meshes, and the dry powder needs to be sealed for storage and is not easy to expose in the air;
3) respectively metering the raw materials according to the proportion;
4) deducting the amount of the metered composite silicate cement, halving the amount of water, putting the rest water and materials in a stirrer, and stirring for 3-5min until the mixture is uniform;
5) packaging the prepared mixture in a plastic bag, placing the plastic bag in an environment with the temperature of 20 ℃ (the plastic bag can be placed in a heat-preservation foam box with a bulb in winter), and aging for 24 hours;
6) and taking out the aged batch, adding the composite portland cement and the rest water, and continuously putting the mixture into a stirrer for stirring. In the stirring process, the batch materials sinking at the bottom are turned over at intervals to ensure that the mixture is more uniform;
7) weighing the batch, pouring the batch into a steel mould, vibrating on a vibration table for 15s, demoulding, taking out the plate, putting the plate into a curing box, and carefully colliding when putting the plate into the curing box to prevent the plate from being damaged as much as possible;
8) putting the plate into a curing box, precuring for 2-3 days in a steam curing environment at 90 ℃, putting the plate into an autoclave, performing steam curing for 8 hours at 174.5 ℃, cooling to room temperature, and taking out;
9) and (4) detecting the appearance quality, water absorption, porosity, apparent density, mechanical property and thermal property of the cured light wallboard.
The finished lightweight wallboard properties are shown in table 1.
TABLE 1 various properties of light wall board made when phosphorus tailings account for 50%
Example 2
In embodiment 2 of the invention, a method for preparing a light wallboard by using phosphate tailings and slag sulfate cement comprises the following raw materials in percentage by mass: 34% of slag sulfate cement, 2% of composite portland cement, 60% of phosphate tailings, 4% of expanded perlite and 25% of water in mass of the total cementing material;
the slag sulfate cement comprises 58% of phosphorus slag, 20% of lime, 20% of gypsum and 2% of anhydrous sodium sulfate by mass.
The phosphorus tailings and phosphorus slag production places are Yunnan phosphorus ore plants, gypsum is dihydrate gypsum, lime is quicklime produced by a glittering and translucent micro powder plant, composite portland cement, anhydrous sodium sulfate and expanded perlite are all commercially available, and mixing water is tap water.
The preparation method of the lightweight wallboard is carried out according to the process flow described in example 1, and the properties of the finished lightweight wallboard are shown in table 2.
TABLE 2 various properties of the light wall board made when the phosphorus tailings accounts for 60%
Example 3
In embodiment 3 of the invention, a method for preparing a light wallboard by using phosphate tailings and slag sulfate cement comprises the following raw materials in percentage by mass: 20% of slag sulfate cement, 5% of composite portland cement, 70% of phosphate tailings, 5% of expanded perlite and 25% of water in the mass of the total cementing material;
the slag sulfate cement comprises 68% of phosphorus slag, 15% of lime, 15% of gypsum and 2% of anhydrous sodium sulfate by mass.
The phosphorus tailings and phosphorus slag production places are Yunnan phosphorus ore plants, gypsum is dihydrate gypsum, lime is quicklime produced by a glittering and translucent micro powder plant, composite portland cement, anhydrous sodium sulfate and expanded perlite are all commercially available, and mixing water is tap water.
The preparation method of the lightweight wallboard is as the process flow described in example 1, and the finished lightweight wallboard has the properties shown in table 3.
TABLE 3 various properties of light wall board made when the phosphorus tailings account for 70%
In conclusion of various embodiments, the lightweight wallboard prepared by the preparation method of the technical scheme has good mechanical property and thermal insulation property, the expanded perlite has good homogeneity under the condition of the mixture ratio of the components of the wallboard filler, the volume deformability is small after high-temperature autoclaved curing, the overall performance is good on the premise of utilizing a large amount of tailings, and the lightweight wallboard has wide application prospect and remarkable social benefit.
Claims (10)
1. The utility model provides a utilize phosphorus tailings and slay sulphate cement preparation light weight wallboard which characterized in that: the light wallboard is prepared from a cementing material and water, wherein the cementing material is prepared from slag sulfate cement, composite silicate cement, phosphate tailings, expanded perlite and water, and the cementing material comprises the following components in percentage by mass: 20-50% of slag sulfate cement, 0-5% of composite portland cement, 3-5% of expanded perlite and the balance of phosphate tailings, wherein the total mass of the slag sulfate cement, the composite portland cement and the expanded perlite meets 100%; water accounts for 20-30% of the mass of the cementing material;
the slag sulfate cement is prepared by grinding phosphorus slag, lime and gypsum and then uniformly mixing the ground phosphorus slag, lime and gypsum with anhydrous sodium sulfate, wherein the slag sulfate cement comprises the following components in percentage by mass: 50-70% of phosphorus slag, 0-20% of gypsum, 1-3.5% of anhydrous sodium sulfate and the balance of lime, wherein the total mass of the materials is 100%.
2. The method for preparing the lightweight wallboard by using the phosphate tailings and the slag sulfate cement as claimed in claim 1, wherein the method comprises the following steps: the phosphate tailings non-radioactive A-class product does not contain harmful substances to human bodies, and the main component of the phosphate tailings is CaMg (CO)3)2And SiO2。
3. The method for preparing the lightweight wallboard by using the phosphate tailings and the slag sulfate cement as claimed in claim 1, wherein the method comprises the following steps: the phosphorus slag does not contain harmful substances to human bodies, the CaO content is more than or equal to 40 percent, and the SiO content is2The content is more than or equal to 30 percent.
4. The method for preparing the lightweight wallboard by using the phosphate tailings and the slag sulfate cement as claimed in claim 1, wherein the method comprises the following steps: the lime contains more than or equal to 60 percent of CaO, less than or equal to 5 percent of MgO, over-burnt lime not more than 5 percent of CaO and under-burnt lime less than 7 percent.
5. The method for preparing the lightweight wallboard by using the phosphate tailings and the slag sulfate cement as claimed in claim 1, wherein the method comprises the following steps: the gypsum is any one of phosphogypsum, desulfurized gypsum, fluorgypsum, natural anhydrite or natural dihydrate gypsum.
6. The method for preparing the lightweight wallboard by using the phosphate tailings and the slag sulfate cement as claimed in claim 1, wherein the method comprises the following steps: the anhydrous sodium sulfate is an excitation auxiliary agent, and the mixing amount of the anhydrous sodium sulfate is determined according to the mixing amount of the phosphorous slag.
7. The method for preparing the lightweight wallboard by using the phosphate tailings and the slag sulfate cement as claimed in claim 1, wherein the method comprises the following steps: the expanded perlite is a system light framework and conforms to the heat conductivity coefficient regulation of JC209 expanded perlite.
8. The method for preparing the lightweight wallboard by using the phosphate tailings and the slag sulfate cement as claimed in claim 1, wherein the method comprises the following steps: the composite portland cement is 42.5 strength grade, and related requirements meet GB/T175 general portland cement.
9. The method for preparing the lightweight wallboard by using the phosphate tailings and the slag sulfate cement as claimed in claim 1, wherein the method comprises the following steps: the water is used for mixing common light wall boards.
10. The method for preparing the lightweight wallboard by using the phosphate tailings and the slag sulfate cement as claimed in claim 1, which is characterized by comprising the following specific steps:
(1) drying the phosphate tailings, sieving the phosphate tailings by a 0.3mm sieve, and taking the sieved part as a raw material; drying the phosphorus slag and the lime, and placing the phosphorus slag and the lime in a dry place for later use;
(2) respectively ball-milling the phosphorus slag, the lime and the gypsum treated in the step (1), and grinding the phosphorus slag treated in the step (1) to 350-400m3The lime is ground to the fineness of less than 20 percent, the gypsum is ground to 200 meshes, and the dry powder needs to be sealed for storage and is not easy to expose in the air;
(3) respectively metering the raw materials according to the proportion;
(4) deducting the amount of the metered composite silicate cement, halving the amount of water, putting the rest water and materials in a stirrer, and stirring for 3-5min until the mixture is uniform to obtain a mixture;
(5) packaging the prepared mixture in a plastic bag, placing the plastic bag in an environment with the temperature of 20 ℃ (the plastic bag can be placed in a heat-preservation foam box with a bulb in winter), and aging for 24 hours;
(6) taking out the aged batch obtained in the step (5), adding the composite portland cement and the rest water, and continuously putting the mixture into an internal stirrer for stirring; in the stirring process, the batch materials sinking at the bottom are turned over at intervals, so that the batch materials are mixed more uniformly;
(7) weighing the batch mixture obtained in the step (6), pouring the batch mixture into a steel mould, vibrating the batch mixture on a vibrating table for 15s, and demoulding to take out a plate;
(8) putting the plate obtained in the step (7) into a maintenance box, and carefully colliding the plate when the plate is put into the maintenance box to prevent the plate from being damaged as much as possible; precuring for 2-3 days in a steam curing environment at 90 ℃, then putting the cured plate into a still kettle, performing steam curing for 8 hours at 174.5 ℃, cooling to room temperature, and taking out to obtain a cured light wallboard;
(9) and (4) detecting the appearance quality, water absorption, porosity, apparent density, mechanical property and thermal property of the cured light wallboard.
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