CN112516780A - Calcium-based desulfurizer and preparation method thereof - Google Patents
Calcium-based desulfurizer and preparation method thereof Download PDFInfo
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- CN112516780A CN112516780A CN202011167737.4A CN202011167737A CN112516780A CN 112516780 A CN112516780 A CN 112516780A CN 202011167737 A CN202011167737 A CN 202011167737A CN 112516780 A CN112516780 A CN 112516780A
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 239000011575 calcium Substances 0.000 title claims abstract description 26
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title abstract description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 56
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 36
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 29
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 29
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 28
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 21
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 21
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 239000011734 sodium Substances 0.000 claims description 21
- 238000001354 calcination Methods 0.000 claims description 12
- 239000004115 Sodium Silicate Substances 0.000 claims description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 2
- 238000004062 sedimentation Methods 0.000 claims description 2
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 2
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 2
- 239000000843 powder Substances 0.000 abstract description 10
- 239000007787 solid Substances 0.000 abstract description 2
- 239000013618 particulate matter Substances 0.000 abstract 1
- 239000011148 porous material Substances 0.000 abstract 1
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 50
- 238000001179 sorption measurement Methods 0.000 description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 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
- 239000007864 aqueous solution Substances 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/041—Oxides or hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/043—Carbonates or bicarbonates, e.g. limestone, dolomite, aragonite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/12—Naturally occurring clays or bleaching earth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
- B01D2253/11—Clays
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2253/10—Inorganic adsorbents
- B01D2253/112—Metals or metal compounds not provided for in B01D2253/104 or B01D2253/106
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- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4806—Sorbents characterised by the starting material used for their preparation the starting material being of inorganic character
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- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
- B01J2220/4825—Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton
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Abstract
The invention discloses a calcium-based desulfurizer and a preparation method thereof. The calcium-based high-efficiency desulfurizer is prepared from the following raw materials: calcium carbonate, calcium hydroxide, kaolin and a pore-forming agent; the calcium carbonate is light calcium carbonate, the mesh number of all raw materials is controlled to be 400-600 meshes, the calcium carbonate is mixed with water and then is extruded and molded, the structure is solid, powder is not easy to generate, the compact pore size can be formed, and SO2 can be efficiently adsorbed. The problems that the existing dry-based desulfurizer is easy to generate powder when used in a desulfurizing tower, the particulate matter emission is increased, and the desulfurizing effect is poor are solved.
Description
Technical Field
The invention relates to the technical field of waste gas treatment environment, in particular to a calcium-based desulfurizer and a preparation method thereof.
Background
China is one of the main countries of coal production and consumption in the world, the development of the coal industry in China is increasingly advanced along with the continuous development of social economy, but the situation of sulfur dioxide treatment and emission reduction of a coal-fired power plant in China is extremely severe, so that the strengthening of the research on the sulfur dioxide emission and treatment of the coal-fired power plant has important practical significance, and the patent aims to research the current situation of sulfur dioxide emission of the coal-fired power plant in China, explore the development trend of sulfur dioxide emission of the coal-fired power plant and the latest progress of desulfurization measures; at present, the calcium-based desulfurizer is still a main component of a dry-based desulfurizer, has rich raw material reserves, low price and simple preparation process, is still the first choice of the broad desulfurization industry, but the domestic calcium-based desulfurizer mainly has two problems: firstly, the desulfurizer is easy to generate powder in the using process, so that the emission of particulate matters at the outlet of the desulfurizing tower is increased; secondly, the desulfurizer has low adsorption efficiency, so that a large amount of desulfurizer waste materials are accumulated after adsorption, and the treatment cost of the waste desulfurizer at the later stage is greatly increased.
Because the traditional calcium-based desulfurizer is mainly formed by physical extrusion, the mechanical strength is low, and powder is easily generated when the traditional calcium-based desulfurizer runs in a desulfurizing tower; if the physical extrusion forming force is increased blindly, the specific surface area of the desulfurizer is easily reduced greatly, the utilization rate of the desulfurizer is reduced, the use amount of the desulfurizer is increased, the recovery of the desulfurizer after use is a difficult problem, and secondary pollution is easily caused.
Disclosure of Invention
The invention aims to provide a calcium-based desulfurizer and a preparation method thereof, and aims to solve the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a calcium-based desulfurizing agent comprises the following components: calcium carbonate, calcium hydroxide, kaolin, a pore-forming agent, water and sodium carboxymethyl cellulose (CMC-Na), wherein the weight portions are as follows: 100-200 parts of light calcium carbonate, 500 parts of calcium hydroxide, 100-200 parts of kaolin, 20-50 parts of pore-forming agent, 5-10 parts of CMC-Na and 250 parts of water.
Further, the weight portions are as follows: 200 parts of light calcium carbonate, 450 parts of calcium hydroxide, 100 parts of kaolin, 150 parts of a pore-forming agent, 30-40 parts of CMC-Na 6-8 parts of water, and 200 parts of water; the calcium carbonate is light calcium carbonate and the kaolin is calcined kaolin.
Furthermore, the content of calcium carbonate is more than or equal to 95 percent, the sedimentation volume is 2.4-2.8mL/g, and the mesh number is 400-600 meshes.
Furthermore, the content of the calcium hydroxide is more than or equal to 98 percent, and the mesh number is 400-600 meshes.
Further, the calcination temperature of the kaolin is 500-700 ℃, and the calcination time is 30-45 min.
Further, the pore-forming agent is sodium silicate.
Further, the method for preparing the calcium-based desulfurizing agent comprises the following steps:
step 1, selecting calcium carbonate, calcium hydroxide, kaolin, a pore-forming agent and CMC-Na which meet the requirements, uniformly stirring, adding water, and uniformly stirring;
step 2, making the mixed raw materials into a rod-shaped granular desulfurizer through a forming machine;
and 3, calcining the molded desulfurizer at the temperature of 200-300 ℃ for 1-1.5h to obtain the molded desulfurizer.
Compared with the prior art, the invention has the following technical effects:
the raw materials selected by the invention are mineral resources with abundant reserves and low price, and the cost is saved. And the pore-forming agent is added, so that the adsorption effect of the desulfurizer is more obvious, the adsorption efficiency is greatly improved, the CMC-Na ensures that the texture of the desulfurizer is firmer, powder is not easy to generate in the process of carrying and using, and other pollution is avoided. The desulfurizer after saturated adsorption can form anhydrous gypsum for recycling, realizes the recycling of resources, and combines the modern concepts of green and environmental protection.
The preparation method of the calcium-based desulfurizer has the advantages of easily available raw materials, low price, simple stirring and uniform mixing, extrusion molding to obtain the finished product desulfurizer, simple production process, good use effect, recyclable subsequent waste materials and the like, no pollution, good benefit and energy conservation and emission reduction.
Drawings
FIG. 1 is a flow chart of the production process of a calcium-based desulfurizing agent.
Detailed Description
The invention is further illustrated by the following examples:
the calcium-based desulfurizer provided by the invention is mainly prepared from the following raw materials: light calcium carbonate, calcium hydroxide, kaolin, a pore-forming agent and CMC-Na; the content of the light calcium carbonate is more than or equal to 95 percent, and the mesh number is between 400 meshes and 600 meshes. The content of the calcium hydroxide is more than or equal to 98 percent, and the mesh number is between 400 meshes and 600 meshes. The kaolin is calcined kaolin, the calcination temperature is 500-700 ℃, and the calcination time is 30-45 min. The pore-forming agent is sodium silicate. The CMC-Na is selected from 0.3-0.6 Pa of medium viscosity (2% aqueous solution).
In the preferred embodiment of the present invention, the molding and calcining temperature is preferably 200-300 ℃, and the calcining time is preferably about 1 h.
In a preferred embodiment of the present invention, the calcium-based desulfurizing agent comprises the following raw materials by weight: 100-150 parts of calcium carbonate, 550 parts of calcium hydroxide, 250 parts of kaolin, 20-50 parts of pore-forming agent, 5-15 parts of CMC-Na and 10-20 parts of water. More preferably 100 parts of calcium carbonate, 450 parts of calcium hydroxide, 250 parts of kaolin, 30 parts of pore-forming agent, 15 parts of CMC-Na and 155 parts of water.
The weight in the present invention may be in the unit of mg, g, kg or the like known in the art, or may be in multiples of the weight, such as 1/10, 10, 100, or the like.
The calcium-based desulfurizer is preferably rod-shaped particles, the diameter of the rod-shaped particles is about 8mm, and the length of the rod-shaped particles is 2-3 cm; the specific surface area is 400-500m2/kg, preferably 450m 2/kg.
The average fineness of the calcium-based desulfurizer is preferably 400 meshes.
The preferred pore-forming agent of the invention is sodium silicate, and the modulus of the sodium silicate is as follows: the modulus of n ═ SiO2/Na2O (molar ratio) shows the composition of sodium silicate, and is an important parameter of sodium silicate, generally between 1.5 and 3.5, preferably between 2.5 and 3.5.
The molecular weight of CMC-Na selected by the product of the invention is preferably about ten thousand.
The diatomite selected in the invention is preferably Suzhou Yangshan kaolin, the ore deposit is hydrothermal alteration type kaolin, the content of Al2O3 can reach about 39.0%, and the diatomite is pure white and has fine particles. The catalyst is mainly used for catalyst carriers and chemical raw materials.
The diatomite selected in the invention is calcined kaolin, the calcination temperature is preferably about 500 ℃, and the calcination time is preferably 50 min.
The invention also aims to provide a preparation method of the calcium-based high-efficiency desulfurizing agent, which comprises the following steps,
(1) the proper amount of light calcium carbonate, calcium hydroxide, kaolin, pore-forming agent and CMC-Na are selected, and the mesh number is controlled between 400 meshes and 600 meshes.
(2) The materials are mixed well and a suitable amount of water is added for preparation before forming.
(3) And granulating the uniformly mixed raw materials by a particle forming machine to obtain a desulfurizer sample with a proper diameter and length.
(4) And drying the formed desulfurizer, removing excessive water, and curing.
Example 1
The desulfurizer sample comprises the following raw materials in proportion: 25% of calcium carbonate, 25% of calcium hydroxide, 25% of kaolin, 5% of pore-forming agent, 10% of CMC-Na and 10% of water, wherein the desulfurizer produced according to the proportion has a compact structure and is not easy to generate powder, and the saturated adsorption rate of sulfur dioxide can reach 28.3%, namely, the desulfurizer per unit mass can adsorb 0.283 unit mass of sulfur dioxide; the absorption rate reaches more than 95 percent and is 100mg/m3After the sulfur dioxide gas passes through the desulfurizer at a constant speed, the concentration of the sulfur dioxide measured at the outlet is less than 5mg/m3。
Example 2
The desulfurizer sample comprises the following raw materials in proportion: 20% of calcium carbonate, 35% of calcium hydroxide, 20% of kaolin, 5% of pore-forming agent, 10% of CMC-Na and 10% of water, wherein the desulfurizer produced according to the proportion has a compact structure and is not easy to generate powder, and the saturated adsorption rate of sulfur dioxide can reach 29.6%, namely, the desulfurizer per unit mass can adsorb 0.296 unit mass of sulfur dioxide; the absorption rate reaches more than 97 percent and is 100mg/m3After the sulfur dioxide gas passes through the desulfurizer at a constant speed, the concentration of the sulfur dioxide measured at the outlet is less than 3mg/m3。
Example 3
The desulfurizer sample comprises the following raw materials in proportion: 10% of calcium carbonate, 45% of calcium hydroxide, 20% of kaolin, 5% of pore-forming agent, 10% of CMC-Na and 10% of water, wherein the desulfurizer produced according to the proportion has a compact structure and is not easy to generate powder, and the saturation adsorption rate of sulfur dioxide can reach 31.3%, namely, the desulfurizer per unit mass can adsorb 0.313 unit mass of sulfur dioxide; the absorption rate reaches more than 98 percent and is 100mg/m3After the sulfur dioxide gas passes through the desulfurizer at a constant speed, the concentration of the sulfur dioxide is measured at an outletThe degree is less than 2mg/m3。
Example 4
The desulfurizer sample comprises the following raw materials in proportion: 10% of calcium carbonate, 45% of calcium hydroxide, 20% of kaolin, 10% of pore-forming agent, 5% of CMC-Na and 10% of water, wherein the desulfurizer produced according to the proportion has a compact structure, but a small amount of powder is generated in the carrying process, which is probably caused by over-high pore-forming dosage and low CMC-Na content, so that the forming effect is poor, the texture is not firm enough, and the saturated adsorption rate of sulfur dioxide can reach 30.8%, namely, each unit mass of the desulfurizer can adsorb 0.308 unit mass of sulfur dioxide; the absorption rate reaches more than 97 percent and is 100mg/m3After the sulfur dioxide gas passes through the desulfurizer at a constant speed, the concentration of the sulfur dioxide measured at the outlet is less than 3mg/m3。
Example 5
The desulfurizer sample comprises the following raw materials in proportion: 10% of calcium carbonate, 45% of calcium hydroxide, 20% of kaolin, 3% of pore-forming agent, CMC-Na 12% and 10% of water, wherein the surface of the produced desulfurizer is smooth and solid, but no powder is generated in the carrying process, the sulfur dioxide adsorption effect is poor probably because the pore-forming agent is too small, and the saturated adsorption rate of sulfur dioxide is 23.5%, namely, the desulfurizer per unit mass can adsorb 0.235 unit mass of sulfur dioxide; the absorption rate reaches more than 91 percent and is 100mg/m3After the sulfur dioxide gas passes through the desulfurizer at a constant speed, the concentration of the sulfur dioxide measured at the outlet is less than 9mg/m3。
Claims (7)
1. The calcium-based desulfurizing agent is characterized by comprising the following components: calcium carbonate, calcium hydroxide, kaolin, a pore-forming agent, water and sodium carboxymethyl cellulose (CMC-Na), wherein the weight portions are as follows: 100-200 parts of light calcium carbonate, 500 parts of calcium hydroxide, 100-200 parts of kaolin, 20-50 parts of pore-forming agent, 5-10 parts of CMC-Na and 250 parts of water.
2. The calcium-based desulfurizing agent according to claim 1, wherein the weight ratio of: 200 parts of light calcium carbonate, 450 parts of calcium hydroxide, 100 parts of kaolin, 150 parts of a pore-forming agent, 30-40 parts of CMC-Na 6-8 parts of water, and 200 parts of water; the calcium carbonate is light calcium carbonate and the kaolin is calcined kaolin.
3. The calcium-based desulfurizing agent of claim 1, wherein the calcium carbonate content is not less than 95%, the sedimentation volume is 2.4-2.8mL/g, and the mesh number is 400-600 mesh.
4. The calcium-based desulfurizing agent of claim 1, wherein the calcium hydroxide content is greater than or equal to 98%, and the mesh size is 400-600 mesh.
5. The calcium-based desulfurizing agent according to claim 1, wherein the calcination temperature of kaolin is 500 to 700 ℃ and the calcination time is 30 to 45 min.
6. The calcium-based desulfurizing agent according to claim 1, wherein the pore-forming agent is sodium silicate.
7. A process for preparing the calcium-based desulfurizing agent according to any one of claims 1 to 7, comprising the steps of:
step 1, selecting calcium carbonate, calcium hydroxide, kaolin, a pore-forming agent and CMC-Na which meet the requirements, uniformly stirring, adding water, and uniformly stirring;
step 2, making the mixed raw materials into a rod-shaped granular desulfurizer through a forming machine;
and 3, calcining the molded desulfurizer at the temperature of 200-300 ℃ for 1-1.5h to obtain the molded desulfurizer.
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| CN113831108A (en) * | 2021-09-30 | 2021-12-24 | 杭州奥兴筑友科技有限公司 | Method for preparing light ceramsite by using machine-made sand sludge |
| CN115779850A (en) * | 2022-11-01 | 2023-03-14 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Silica-based stone powder material, preparation method and application |
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