CN117205900B - Adsorbent for electric furnace flue gas and preparation method thereof - Google Patents
Adsorbent for electric furnace flue gas and preparation method thereof Download PDFInfo
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- 239000003463 adsorbent Substances 0.000 title claims abstract description 84
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 239000003546 flue gas Substances 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 57
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical class O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000002994 raw material Substances 0.000 claims abstract description 28
- 229920001661 Chitosan Polymers 0.000 claims abstract description 27
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical class O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 22
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052901 montmorillonite Inorganic materials 0.000 claims abstract description 16
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 13
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 13
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 125000002091 cationic group Chemical group 0.000 claims abstract description 10
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 10
- 239000000741 silica gel Substances 0.000 claims abstract description 10
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 10
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000005011 phenolic resin Substances 0.000 claims abstract description 7
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 7
- 239000002893 slag Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 26
- 244000276331 Citrus maxima Species 0.000 claims description 24
- 235000001759 Citrus maxima Nutrition 0.000 claims description 24
- 239000000779 smoke Substances 0.000 claims description 22
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims description 20
- 239000004021 humic acid Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 16
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 14
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 11
- 239000004202 carbamide Substances 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 11
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 7
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 7
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 7
- 229910021536 Zeolite Inorganic materials 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- DCKVFVYPWDKYDN-UHFFFAOYSA-L oxygen(2-);titanium(4+);sulfate Chemical compound [O-2].[Ti+4].[O-]S([O-])(=O)=O DCKVFVYPWDKYDN-UHFFFAOYSA-L 0.000 claims description 6
- 239000002244 precipitate Substances 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 6
- 238000000967 suction filtration Methods 0.000 claims description 6
- 229910000348 titanium sulfate Inorganic materials 0.000 claims description 6
- 239000010457 zeolite Substances 0.000 claims description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000009210 therapy by ultrasound Methods 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 claims description 2
- 231100000719 pollutant Toxicity 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 21
- 239000000428 dust Substances 0.000 abstract description 19
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 description 71
- 230000000052 comparative effect Effects 0.000 description 28
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 13
- 239000003517 fume Substances 0.000 description 9
- 239000003054 catalyst Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000003993 interaction Effects 0.000 description 5
- 238000009628 steelmaking Methods 0.000 description 5
- 230000002195 synergetic effect Effects 0.000 description 5
- 239000004408 titanium dioxide Substances 0.000 description 5
- 229910001385 heavy metal Inorganic materials 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000002923 metal particle Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 240000000560 Citrus x paradisi Species 0.000 description 1
- -1 NO X Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000003957 anion exchange resin Substances 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The application relates to the technical field of adsorbents, and particularly discloses an adsorbent for electric furnace flue gas and a preparation method thereof. The adsorbent comprises the following raw materials in parts by weight: 4-7 parts of carbide slag, 6-12 parts of modified zeolite powder, 4-7 parts of modified montmorillonite, 3-7 parts of chitosan modified titanium dioxide, 3-5 parts of silica gel powder, 5-9 parts of phenolic resin and 2-5 parts of dodecacalcium heptaluminate; the modified montmorillonite is obtained by modifying montmorillonite through molybdenum disulfide and polyvinyl alcohol, and the modified zeolite powder is obtained by modifying cationic polyacrylamide and ferric trichloride. The adsorbent for the electric furnace flue gas can efficiently adsorb NO in the electric furnace flue gas x 、SO 2 Harmful substances such as dust.
Description
Technical Field
The invention relates to the technical field of adsorbents, in particular to an adsorbent for electric furnace flue gas and a preparation method thereof.
Background
The electric furnace steelmaking has the advantages of short flow, low energy consumption and the like, and becomes one of the main steelmaking methods at present. And with the rapid development of electric steelmaking technology and gradual release of waste steel resources, the proportion of short-flow electric steelmaking in the steel industry in China is gradually increased.
However, the current electric furnace general production is obtained by operating under micro-positive pressure or micro-negative pressure atmosphere, and the electric furnace has poor sealing property, so that partial flue gas can overflow in the steelmaking process of the electric furnace; in addition, there is often a significant amount of flue gas spills when charging into the electric furnace. Because the flue gas of the electric furnace contains smoke dust, carbon monoxide and NO X 、SO 2 And organic matters, heavy metals and other components, so that the overflow of the electric furnace smoke not only seriously damages the environment, but also brings hidden danger to the health of related staff.
At present, the method for treating the flue gas is an adsorption method, wherein the effect of the adsorption method is greatly influenced by the quality of the adsorbent, and therefore, the need for providing an adsorbent capable of efficiently treating the flue gas of an electric furnace is urgent.
Disclosure of Invention
In order to improve the treatment effect on the electric furnace flue gas, the application provides an adsorbent for the electric furnace flue gas and a preparation method thereof.
In a first aspect, the present application provides an adsorbent for flue gas of an electric furnace, which adopts the following technical scheme:
an adsorbent for flue gas of an electric furnace comprises the following raw materials in parts by weight: 4-7 parts of carbide slag, 6-12 parts of modified zeolite powder, 4-7 parts of modified montmorillonite, 3-7 parts of chitosan modified titanium dioxide, 3-5 parts of silica gel powder, 5-9 parts of phenolic resin and 2-5 parts of dodecacalcium heptaluminate; the modified montmorillonite is obtained by modifying montmorillonite through molybdenum disulfide and polyvinyl alcohol, and the modified zeolite powder is obtained by modifying cationic polyacrylamide and ferric trichloride.
Through the technical scheme, the adsorbent for the electric furnace flue gas has the advantages that the adsorbent for the electric furnace flue gas has NO x The adsorption amount of (C) is 46.3-48.1mg/g, and the adsorption amount of (C) is equal to that of SO 2 The adsorption amount of the catalyst is 57.3-58.4mg/g, and the adsorption amount of the catalyst to dust is 23.1-24.3mg/g. Therefore, the adsorbent for the electric furnace flue gas has the advantages that the adsorption performance of the adsorbent is obviously improved through the mutual synergistic effect among the raw materials, the adsorption quantity of harmful substances is improved, and the market demand is met.
In the application, the carbide slag is added to react with organic matters in the electric furnace flue gas, so that the viscosity of the electric furnace flue gas is reduced, and the adsorbent for the electric furnace flue gas can effectively adsorb harmful gases and dust in the electric furnace flue gas; by adding the modified montmorillonite, the molybdenum disulfide and the polyvinyl alcohol are used for modifying the montmorillonite, so that the adsorption force is enhanced, the number of micropores is obviously increased, the adsorption capacity is higher, and the adsorption capacity of the adsorbent can be further improved by mutual cooperation with silica gel powder and phenolic resin; in addition, the montmorillonite is modified by molybdenum disulfide and polyvinyl alcohol, so that the obtained modified montmorillonite has stronger adsorption performance on heavy metal particles; the titanium dioxide is modified by adding chitosan, and the titanium dioxide is modified by chitosan, so that the dispersibility, antibacterial property and catalytic degradation property of the titanium dioxide can be improved; because of the interaction force between the chitosan and the molybdenum disulfide, the chitosan modified titanium dioxide and the modified montmorillonite have interaction synergistic effect, and the adsorption effect on heavy metal particles can be improved, so that the adsorption performance of the electric furnace flue gas adsorbent is improved, and the adsorption quantity of dust in the electric furnace flue gas is improved. In addition, by adding the calcium dodecaheptaluminate, the adsorption rate of harmful substances in the flue gas of the electric furnace can be improved.
Optionally, the modified montmorillonite comprises the following raw materials in parts by weight: 10-14 parts of polyvinyl alcohol, 140-160 parts of water, 1-2 parts of molybdenum disulfide powder and 40-60 parts of montmorillonite powder.
Optionally, the modified montmorillonite is prepared by the following method: dissolving polyvinyl alcohol in 9/10 of the total amount of water to obtain a material I; adding molybdenum disulfide powder into the rest water, and performing ultrasonic treatment for 1h to obtain a material II; and (3) dropwise adding the material II into the material I, stirring for 5min, then adding montmorillonite powder, stirring until the materials are uniformly mixed, and drying to obtain the modified montmorillonite.
Optionally, the chitosan modified titanium dioxide comprises the following raw materials in parts by weight: 5-6 parts of titanium sulfate, 6-7 parts of urea, 100-110 parts of water and 100-105 parts of 2wt% chitosan acetic acid solution.
Optionally, the chitosan modified titanium dioxide is prepared by the following method: adding titanium sulfate and urea into water, dissolving, reacting for 1h at 60 ℃, adding 2wt% chitosan acetic acid solution, adjusting pH to 4.8-5.2 with 2mol/L ammonia water, reacting for 3-4h, washing precipitate with water, drying, grinding, calcining, and obtaining chitosan modified titanium dioxide.
Optionally, the modified zeolite powder comprises the following raw materials in parts by weight: 10-12 parts of zeolite powder, 0.01-0.1 part of cationic polyacrylamide and 0.4-0.5 part of polyvinylpyrrolidone.
Optionally, the modified zeolite powder is prepared by the following method: mixing zeolite powder and polyvinylpyrrolidone uniformly, heating at 300-400 ℃ for 2h, adding cationic polyacrylamide, and carrying out ultrasonic vibration for 20min to obtain modified zeolite powder.
Optionally, the adsorbent also comprises 2-4 parts by weight of humic acid modified shaddock peel pulp.
By adopting the technical scheme, the mutual synergistic effect exists between the humic acid modified shaddock peel pulp and the chitosan modified titanium dioxide, so that the adsorption effect of the adsorbent on harmful substances can be further improved.
Optionally, the humic acid modified shaddock peel pulp comprises the following raw materials in parts by weight: 3-4 parts of shaddock peel powder, 8-9 parts of sodium hydroxide, 9-10 parts of urea, 160-180 parts of water and 0.06-0.1 part of humic acid; the humic acid modified shaddock peel pulp is prepared by the following method: drying and crushing the pulp of the shaddock Pi Nabai, and sieving the crushed pulp with a 100-mesh sieve to obtain shaddock peel powder; adding shaddock peel powder, sodium hydroxide and urea into 4/5 of the total amount of water at 30 ℃, stirring for 45min, carrying out suction filtration, washing with water, and drying at 60 ℃ for 24h to obtain a material III; adding the material III and humic acid into the rest water at 30 ℃, stirring for 6 hours, carrying out suction filtration, and washing with water to obtain a material IV; and (3) drying the material IV at 60 ℃ for 24 hours, grinding, and sieving with a 50-mesh sieve to obtain the humic acid modified shaddock peel pulp.
In a second aspect, the present application provides a method for preparing an adsorbent for flue gas of an electric furnace, which adopts the following technical scheme:
the preparation method of the adsorbent for the flue gas of the electric furnace comprises the following steps:
and uniformly mixing the raw materials of the adsorbent for the electric furnace flue gas, and granulating to obtain the adsorbent for the electric furnace flue gas.
By adopting the technical scheme, the preparation process of the adsorbent for the electric furnace flue gas is simple and easy to operate.
In summary, the present application has at least the following beneficial effects:
1. the adsorbent for the electric furnace flue gas has excellent adsorption performance on harmful substances in the electric furnace flue gas through the interaction and synergism among the modified zeolite powder, the modified montmorillonite, the silica gel powder, the phenolic resin and the dodecacalcium heptaluminate;
2. according to the adsorbent for the electric furnace flue gas, the chitosan modified titanium dioxide and the humic acid modified shaddock peel pulp are added, and due to the interaction force between the chitosan and the humic acid, the interaction synergistic effect exists between the chitosan modified titanium dioxide and the humic acid modified shaddock peel pulp, so that the adsorption capacity of the adsorbent for the electric furnace flue gas can be improvedIn heavy metal particles, carbon monoxide, NO X 、SO 2 The adsorption performance of the substances, and the like, so that the adsorption effect of the adsorbent for the electric furnace flue gas on harmful substances in the electric furnace flue gas is further improved.
Detailed Description
The present invention will be described in further detail with reference to examples.
Preparation example
Preparation example 1
A modified montmorillonite prepared by the following method:
10-14 parts of polyvinyl alcohol, 140-160 parts of water, 1-2 parts of molybdenum disulfide powder and 40-60 parts of montmorillonite powder.
Dissolving 11kg of polyvinyl alcohol in 135kg of the total amount of water, and stirring for 10min to obtain a material I; adding two 1kg of molybdenum sulfide powder into 15kg of water, and performing ultrasonic treatment for 1h to obtain a material II; and (3) dropwise adding the material II into the material I within 15min, stirring for 5min, then adding montmorillonite powder, stirring until the montmorillonite powder is uniformly mixed, and drying to obtain the modified montmorillonite. Wherein, the polyvinyl alcohol is 160 mesh polyvinyl alcohol 2488 powder; the granularity of the molybdenum disulfide is 800 meshes; the montmorillonite powder has a particle size of 800 meshes, a hardness of 4.8, an expansion factor of 16 times, and a density (g/cm) 3 ) The apparent viscosity was 20mPa.s.
Preparation example 2
The chitosan modified titanium dioxide is prepared by the following method:
adding 5kg of titanium sulfate and 6kg of urea into 105kg of water, stirring until the titanium sulfate and the 6kg of urea are completely dissolved, and reacting for 1h at 60 ℃ in a constant-temperature water bath kettle; under the stirring condition, 100kg of 2wt% chitosan acetic acid solution is added, the pH value is regulated to be 5 by using 2mol/L ammonia water, after the reaction is carried out for 4 hours, the precipitate is taken out, distilled water is used for washing the precipitate until the concentration of sulfate ions of water obtained by washing the precipitate is lower than 1mg/L, the washed precipitate is dried in an oven at 80 ℃ for 8 hours, ground to 200 meshes, and calcined at 450 ℃ for 4 hours, thus obtaining the chitosan modified titanium dioxide.
Preparation example 3
The modified zeolite powder is prepared by the following method:
10-12 parts of zeolite powder, 0.01-0.1 part of cationic polyacrylamide and 0.4-0.5 part of polyvinylpyrrolidone.
Mixing 11kg of zeolite powder and 0.4kg of polyvinylpyrrolidone uniformly, heating at 350 ℃ for 2 hours, adding 0.02kg of cationic polyacrylamide, and carrying out ultrasonic vibration for 20 minutes to obtain modified zeolite powder. Wherein the polyvinyl pyrrolidone model is pvc-k 90, and the content is more than or equal to 96%; the model of the cationic polyacrylamide is PAM cation, and the cationic degree is 20.
Preparation example 4
A humic acid modified grapefruit Pi Rang is prepared by the following method:
taking white pulp in fresh shaddock peel, washing with water, drying at 60 ℃ for 24 hours, crushing, grinding, and sieving with a 100-mesh sieve to obtain shaddock peel powder; adding 3.5kg of shaddock peel powder, 8kg of sodium hydroxide and 9kg of urea into 144kg of water at 30 ℃, stirring for 45min, carrying out suction filtration, washing with water, and drying at 60 ℃ for 24h to obtain a material III; adding the material III and 0.08kg of humic acid into 36kg of water at 30 ℃, stirring for 6 hours, carrying out suction filtration, and washing to obtain a material IV; and (3) drying the material IV at 60 ℃ for 24 hours, grinding, and sieving with a 50-mesh sieve to obtain the humic acid modified shaddock peel pulp.
Examples
TABLE 1 raw material contents (kg) of adsorbents for electric furnace fumes in examples 1 to 4
| Raw materials | Example 1 | Example 2 | Example 3 | Example 4 |
| Carbide slag | 4 | 5 | 6 | 7 |
| Modified zeolite powder | 6 | 8 | 10 | 12 |
| Modified montmorillonite | 7 | 6 | 4 | 5 |
| Chitosan modified titanium dioxide | 3 | 7 | 5 | 6 |
| Silica gel powder | 5 | 3.5 | 3 | 4 |
| Phenolic resin | 9 | 7 | 8 | 5 |
| Dodecacalcium heptaluminate | 3 | 4 | 2 | 5 |
Example 1
The raw material content of the adsorbent for flue gas of the electric furnace is shown in table 1.
Wherein, the type of the carbide slag is industrial grade, the whiteness is 90 percent, the fineness is 200 meshes, and the content of strong calcium oxide is more than or equal to 80 percent; the modified zeolite powder is prepared from preparation example 3; the modified montmorillonite is prepared in preparation example 1; the chitosan modified titanium dioxide is prepared from preparation example 2; the granularity of the silica gel powder is 400 meshes; viscosity is 0, temperature resistance is 1300 ℃, and product number is C; the model of phenolic resin is CRORESINEX A233, the acid and alkali are alkaline, the particle size is 0.315-1.25mm, and the ionic type is anion exchange resin.
An adsorbent for flue gas of an electric furnace is prepared by the following method:
mixing the raw materials of the adsorbent for the electric furnace flue gas, stirring for 10min at 600r/min, and granulating to obtain the flue gas pollutant adsorbent with the particle size of 3 mm.
Examples 2 to 4
The adsorbents for electric furnace fumes of examples 2 to 4 are different from example 1 in the raw material content of the adsorbents for electric furnace fumes, and the rest is the same as example 1.
Example 5
The adsorbent for electric furnace fume was different from example 3 in that 3kg of humic acid modified shaddock peel pulp prepared in preparation example 4 was further included in the adsorbent for electric furnace fume, and the rest was the same as in example 3.
Comparative example
Comparative example 1
An adsorbent for flue gas of an electric furnace is different from example 1 in that the chitosan-modified titania is replaced with an equal amount of titania, and the rest is the same as in example 1.
Comparative example 2
An adsorbent for electric furnace fume was different from example 1 in that the modified montmorillonite was replaced with an equivalent amount of montmorillonite powder, and the rest was the same as in example 1.
Comparative example 3
An adsorbent for flue gas of an electric furnace is different from example 1 in that dodecacalcium heptaluminate is not added to the raw material, and the rest is the same as example 1.
Comparative example 4
An adsorbent for flue gas of an electric furnace is different from example 1 in that no silica gel powder is added to the raw material, and the rest is the same as example 1.
Comparative example 5
An adsorbent for flue gas of an electric furnace is different from example 1 in that modified montmorillonite is not added to the raw material, and the rest is the same as example 1.
Performance test
The following performance tests were carried out on 10 adsorbents for electric furnace fumes prepared in examples 1 to 5 and comparative examples 1 to 5:
5g of the adsorbent for the electric furnace flue gas prepared in the examples 1-5 and the comparative examples 1-5 are respectively taken and placed in a reactor for experiment, and harmful substances in the electric furnace flue gas are simulated and detected: NO is to be NO x 、SO 2 And dust, wherein NO is blown into the reaction system x The concentration is 15mg/m 3 ，SO 2 The concentration is 8mg/m 3 Dust 8mg/m 3 The reaction space velocity (GHSV) is 80000h -1 . The adsorption amounts of the 10 adsorbents for electric furnace fumes to harmful substances (adsorption amount=harmful substance/adsorbent=mg/g) were measured, and the measurement results are shown in table 2.
TABLE 2 detection results
| Detecting items | NO x /mg/g | SO 2 /mg/g | Dust/mg/g |
| Example 1 | 46.3 | 57.3 | 23.2 |
| Example 2 | 46.4 | 57.6 | 23.1 |
| Example 3 | 48.1 | 58.4 | 24.3 |
| Example 4 | 48.0 | 58.0 | 23.6 |
| Example 5 | 52.6 | 60.1 | 27.8 |
| Comparative example 1 | 38.1 | 44.6 | 15.2 |
| Comparative example 2 | 39.3 | 46.2 | 17.6 |
| Comparative example 3 | 41.6 | 47.8 | 17.7 |
| Comparative example 4 | 41.8 | 47.1 | 16.9 |
| Comparative example 5 | 40.4 | 46.2 | 16.0 |
As can be seen from Table 2, the adsorbent for electric furnace flue gas of the present application has NO x The adsorption amount of (C) is 46.3-52.6mg/g, and the adsorption amount of (C) is equal to that of SO 2 The adsorption amount of the catalyst is 57.3-60.1mg/g, and the adsorption amount of the catalyst to dust is 23.1-27.8mg/g. Therefore, the adsorbent for the electric furnace flue gas has the advantages that the adsorption performance of the adsorbent is obviously improved through the mutual synergistic effect among the raw materials, the adsorption quantity of harmful substances is improved, and the market demand is met.
Comparing comparative example 1 with example 1, the adsorbent pair NO for electric furnace smoke prepared in example 1 x The adsorption amount of (C) is 46.3mg/g, and the concentration of (C) in SO is higher than that in the case of (C) 2 The adsorption amount of (C) was 57.3mg/g, and the adsorption amount of dust was 23.2mg/g. Adsorbent pair NO for electric furnace flue gas prepared in comparative example 1 x The adsorption amount of (C) is 38.1mg/g, and the adsorption amount of (C) is equal to that of SO 2 The adsorption amount of the catalyst was 44.6mg/g, and the adsorption amount of the catalyst to dust was 15.2mg/g. Compared with example 1, the raw materials of the adsorbent for electric furnace smoke in comparative example 1 are prepared by replacing chitosan modified titanium dioxide with equal amount of titanium dioxide, so that the adsorption amount of the adsorbent for electric furnace smoke to harmful substances is reduced, and the modification of the titanium dioxide by chitosan is indicated to be beneficial to improving the adsorption amount of the adsorbent for electric furnace smoke to harmful substances.
Comparing comparative example 2 with example 1, the adsorbent pair NO for electric furnace smoke prepared in example 1 x The adsorption amount of (C) is 46.3mg/g, and the concentration of (C) in SO is higher than that in the case of (C) 2 The adsorption amount of (C) was 57.3mg/g, and the adsorption amount of dust was 23.2mg/g. Adsorbent pair NO for electric furnace flue gas prepared in comparative example 2 x The adsorption amount of (C) is 39.3mg/g, and the concentration of (C) in SO 2 The adsorption amount of (C) was 46.2mg/g, and the adsorption amount of dust was 17.6mg/g. Compared with example 1, the raw material of the adsorbent for electric furnace smoke in comparative example 2 is modified by using the same amount of montmorillonite powder instead of modified montmorillonite, so that the adsorption amount of the adsorbent for electric furnace smoke to harmful substances is reduced, which means that modifying the montmorillonite powder is beneficial to improving the adsorption amount of the adsorbent for electric furnace smoke to harmful substances.
Comparing comparative example 3 with example 1, the adsorbent pair NO for electric furnace smoke prepared in example 1 x The adsorption amount of (C) is 46.3mg/g, and the concentration of (C) in SO is higher than that in the case of (C) 2 The adsorption amount of (C) was 57.3mg/g, and the adsorption amount of dust was 23.2mg/g. Adsorbent pair NO for electric furnace flue gas prepared in comparative example 3 x The adsorption amount of (C) is 41.6mg/g, and the concentration of (C) in SO is higher than that in the case of (C) 2 The adsorption amount of (C) was 47.8mg/g, and the adsorption amount of dust was 17.7mg/g. Compared with example 1, the raw material of the adsorbent for electric furnace smoke in comparative example 3 is not added with dodecacalcium heptaluminate, so that the adsorption amount of the adsorbent for electric furnace smoke to harmful substances is reduced, and the addition of dodecacalcium heptaluminate is helpful for improving the adsorption amount of the adsorbent for electric furnace smoke to harmful substances.
Comparing comparative example 4 with example 1, the adsorbent pair NO for electric furnace smoke prepared in example 1 x The adsorption amount of (C) is 46.3mg/g, and the concentration of (C) in SO is higher than that in the case of (C) 2 The adsorption amount of (C) was 57.3mg/g, and the adsorption amount of dust was 23.2mg/g. Adsorbent pair NO for electric furnace flue gas prepared in comparative example 5 x The adsorption amount of (C) is 41.8mg/g, and the concentration of (C) in SO is higher than that in the case of (C) 2 The adsorption amount of (C) was 47.1mg/g, and the adsorption amount of dust was 16.9mg/g. Compared with example 1, the silica gel powder is not added into the raw material of the adsorbent for electric furnace smoke in comparative example 5, so that the adsorption amount of the adsorbent for electric furnace smoke to harmful substances is reduced, and the addition of the silica gel powder is helpful for improving the adsorption amount of the adsorbent for electric furnace smoke to harmful substances.
Comparative example 5 and example 1 were compared, and the adsorbent for electric furnace fume prepared in example 1 was used for adsorbing NO x The adsorption amount of (C) is 46.3mg/g, and the concentration of (C) in SO is higher than that in the case of (C) 2 The adsorption amount of (C) was 57.3mg/g, and the adsorption amount of dust was 23.2mg/g. Adsorbent pair NO for electric furnace flue gas prepared in comparative example 5 x The adsorption amount of (C) is 40.4mg/g, and the adsorption amount of (C) is equal to that of SO 2 The adsorption amount of (C) was 46.2mg/g, and the adsorption amount of dust was 15.2mg/g. Compared with example 1, the raw material of the adsorbent for electric furnace smoke in comparative example 5 is not added with modified montmorillonite, so that the adsorption amount of the adsorbent for electric furnace smoke to harmful substances is reduced, and the addition of modified montmorillonite is helpful for improving the adsorption amount of the adsorbent for electric furnace smoke to harmful substances.
The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.
Claims (4)
1. The adsorbent for the electric furnace flue gas is characterized by comprising the following raw materials in parts by weight: 4-7 parts of carbide slag, 6-12 parts of modified zeolite powder, 4-7 parts of modified montmorillonite, 3-7 parts of chitosan modified titanium dioxide, 3-5 parts of silica gel powder, 5-9 parts of phenolic resin and 2-5 parts of dodecacalcium heptaluminate;
wherein the modified montmorillonite is obtained by modifying montmorillonite by molybdenum disulfide and polyvinyl alcohol;
the modified montmorillonite comprises the following raw materials in parts by weight: 10-14 parts of polyvinyl alcohol, 140-160 parts of water, 1-2 parts of molybdenum disulfide powder and 40-60 parts of montmorillonite powder;
the modified montmorillonite is prepared by the following method:
dissolving polyvinyl alcohol in 9/10 of the total amount of water to obtain a material I;
adding molybdenum disulfide powder into the rest water, and performing ultrasonic treatment for 1h to obtain a material II;
dripping the material II into the material I, stirring for 5min, adding montmorillonite powder, stirring until the materials are uniformly mixed, and drying to obtain modified montmorillonite;
the chitosan modified titanium dioxide comprises the following raw materials in parts by weight: 5-6 parts of titanium sulfate, 6-7 parts of urea, 100-110 parts of water and 100-105 parts of 2wt% chitosan acetic acid solution;
the chitosan modified titanium dioxide is prepared by the following method:
adding titanium sulfate and urea into water, dissolving, reacting for 1h at 60 ℃, adding 2wt% chitosan acetic acid solution, adjusting the pH to 4.8-5.2 with 2mol/L ammonia water, washing the precipitate after reacting for 3-4h, drying, grinding and calcining to obtain modified titanium dioxide;
the modified zeolite powder comprises the following raw materials in parts by weight: 10-12 parts of zeolite powder, 0.01-0.1 part of cationic polyacrylamide and 0.4-0.5 part of polyvinylpyrrolidone;
the modified zeolite powder is prepared by the following method:
mixing zeolite powder and polyvinylpyrrolidone uniformly, heating at 300-400 ℃ for 2h, adding cationic polyacrylamide, and carrying out ultrasonic oscillation for 20min to obtain modified zeolite.
2. The adsorbent for flue gas of an electric furnace according to claim 1, wherein the adsorbent further comprises 2-4 parts by weight of humic acid modified shaddock peel pulp.
3. The adsorbent for electric furnace smoke according to claim 2, wherein the humic acid modified shaddock peel pulp comprises the following raw materials in parts by weight: 3-4 parts of shaddock peel powder, 8-9 parts of sodium hydroxide, 9-10 parts of urea, 160-180 parts of water and 0.06-0.1 part of humic acid;
the humic acid modified shaddock peel pulp is prepared by the following method:
drying and crushing the pulp of the shaddock Pi Nabai, and sieving the crushed pulp with a 100-mesh sieve to obtain shaddock peel powder;
adding shaddock peel powder, sodium hydroxide and urea into 4/5 of the total amount of water at 30 ℃, stirring for 45min, carrying out suction filtration, washing with water, and drying at 60 ℃ for 24h to obtain a material III;
adding the material III and humic acid into the rest water at 30 ℃, stirring for 6 hours, carrying out suction filtration, and washing with water to obtain a material IV;
and (3) drying the material IV at 60 ℃ for 24 hours, grinding, and sieving with a 50-mesh sieve to obtain the humic acid modified shaddock peel pulp.
4. A method for preparing the adsorbent for flue gas of an electric furnace according to claim 1, comprising the steps of:
and uniformly mixing the raw materials of the adsorbent for the electric furnace flue gas, and granulating to obtain the flue gas pollutant adsorbent.
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