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Preparation method of composite high-activity demercuration adsorbent

An adsorbent and high-activity technology, which is applied in separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of low utilization rate of activated carbon, low adsorption rate, and high cost, and achieve long effective adsorption time and mercury removal activity. The effect of high and good mercury adsorption capacity

Inactive Publication Date: 2017-02-22
吴迪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention: aiming at the problem of spraying powdered activated carbon into the flue gas at present, and the utilization rate of activated carbon is low and the consumption is large, so that the cost of directly adopting activated carbon adsorption method is too high, the adsorption rate is low, and the activity is low. A method for preparing a composite high-activity mercury-removing adsorbent is provided. In the present invention, straw fly ash is soaked and modified in acid, and then modified by soaking in copper chloride solution, so that the modified fly ash has good adsorptive properties. After the attapulgite is treated and modified, copper oxide is loaded on the attapulgite, so that the loaded attapulgite has good catalytic performance and the mercury oxidation rate is improved. The mercury removal adsorbent prepared by the present invention is not only highly effective for mercury High oxidation rate, and good adsorption rate, combining physical adsorption and chemical oxidation, so that the mercury removal activity is high, and it has better mercury adsorption capacity and longer effective adsorption time than traditional activated carbon

Method used

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Examples

Experimental program
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Effect test

example 1

[0018] Weigh 200g of rice straw, dry it and burn it to get straw fly ash, crush the straw fly ash for 5min and add it into tap water 10 times its mass, soak it for 3h and then filter it to get the filter residue, and mix the filter residue with a concentration of 0.5 mol / L hydrochloric acid, stirred for 2 hours and then filtered to obtain the filter residue, put it in an oven, and dry it at 80°C for 10 hours to obtain the treated straw fly ash; weigh 30g of copper chloride and add it to 1000mL of deionized water, stir and mix evenly Finally, add the straw fly ash after the above treatment, heat to 80°C, heat-preserve and stir for 1 hour, cool to room temperature after stirring, filter with suction, put the filter residue into an oven, and dry at 60°C for 6 hours to obtain modified straw fly ash , for subsequent use; take 150g of attapulgite and put it into a ball mill for ball milling for 1h. After ball milling, attapulgite powder is obtained, which is mixed with a 5% hydrochlo...

example 2

[0021]Weigh 250g of rice straw, dry it and burn it to get straw fly ash, crush the straw fly ash for 8 minutes, add it into tap water with 11 times its mass, soak it for 4 hours, and filter it to get the filter residue, and mix the filter residue with the concentration of 0.5 mol / L hydrochloric acid, stirred for 2.5 hours and then filtered to obtain filter residue, put it in an oven and dry at 90°C for 11 hours to obtain the treated straw fly ash; weigh 40g copper chloride and add it to 1500mL deionized water, stir and mix After uniformity, add the above-mentioned treated straw fly ash, heat to 85°C, heat-preserve and stir for 1.5h, cool to room temperature after stirring, filter with suction, put the filter residue into an oven, and dry at 70°C for 7h to obtain modified straw Fly ash, for subsequent use; take 200g attapulgite and put it into a ball mill for ball milling for 1.5h. After ball milling, attapulgite powder is obtained, which is mixed with 5% hydrochloric acid solut...

example 3

[0024] Weigh 300g of rice straw, dry it and burn it to get straw fly ash, crush the straw fly ash for 10min, add it into tap water with 12 times its mass, soak it for 5h, and filter it to get the filter residue, and mix the filter residue with the concentration of 0.5 mol / L hydrochloric acid, stirred for 3 hours and then filtered to obtain the filter residue, put it in an oven and dry at 100°C for 12 hours to obtain the treated straw fly ash; weigh 50g of copper chloride and add it to 2000mL of deionized water, stir and mix evenly Finally, add the straw fly ash after the above treatment, heat to 90°C, keep stirring for 2 hours, cool to room temperature after stirring, filter with suction, put the filter residue into an oven, and dry at 80°C for 8 hours to obtain modified straw fly ash , for subsequent use; take 250g of attapulgite and put it into a ball mill for ball milling for 2 hours. After the ball milling, attapulgite powder is obtained, which is mixed with 5% hydrochloric...

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Abstract

The invention relates to a preparation method of a composite high-activity demercuration adsorbent, and belongs to the technical field of an demercuration adsorbent. Straw fly ash is subjected to acid soaking modification and is then subjected to soaking modification by copper chloride solution, so that the modified fly ash has good adsorbability; after the treatment and modification on attapulgite, copper oxide is loaded on the attapulgite, so that the loaded attapulgite has good catalyst performance; the mercury oxidation rate is improved. The demercuration adsorbent prepared by the invention has high oxidization rate on mercury and good adsorption rate; physical adsorption and chemical adsorption are combined, so that the demercuration activity is high; compared with the conventional active carbon, the high-activity demercuration adsorbent has the advantages of high mercury adsorption capability and long effective adsorption time.

Description

technical field [0001] The invention relates to a preparation method of a composite highly active mercury-removing adsorbent, belonging to the technical field of mercury-removing adsorbents. Background technique [0002] Mercury emission control is another focus after the control of inhalable particulate matter, sulfur oxides, and nitrogen oxides. In order to effectively control the pollution of mercury, a lot of research has been done on the efficient removal of mercury at home and abroad. but our country [0003] The research on mercury emissions from coal combustion is just in its infancy, the control of mercury emissions from coal combustion is only in the laboratory research stage, and various standards on mercury emissions from coal combustion have not yet formed a very complete system. [0004] Coal combustion is one of the main sources of human-friendly pollution. Mercury in coal combustion flue gas is mainly composed of elemental mercury (HgG), divalent mercury co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01D53/81B01D53/64B01D53/02B01J20/30
CPCB01J20/0237B01D53/02B01D53/64B01D53/81B01J20/06B01J20/12B01J20/20
Inventor 吴迪徐越
Owner 吴迪
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