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Preparation method for flue gas mercury-removing active carbon

A technology of activated carbon and granular activated carbon, applied in separation methods, chemical instruments and methods, other chemical processes, etc., can solve the problems of low saturation adsorption capacity of mercury, easy secondary shedding of mercury, etc. Mercury efficient effect

Active Publication Date: 2014-11-19
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0009]Technical problem to be solved: in order to solve the shortcomings of the existing flue gas mercury removal adsorbents such as low mercury saturation adsorption capacity and easy secondary shedding of mercury, make full use of the gaseous element mercury in the Physical adsorption and chemical adsorption with bromine are formed in micropores. The invention provides a method for preparing activated carbon for mercury removal from flue gas. The preparation process is convenient, the product has good mercury removal performance, does not produce secondary pollution, and is easy to commercialize.

Method used

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  • Preparation method for flue gas mercury-removing active carbon
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  • Preparation method for flue gas mercury-removing active carbon

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Removal of chemical groups on the surface of the raw material: the coconut shell-based granular activated carbon raw material was washed with 10 wt.% NaOH solution and dried at 150 °C.

[0035] (2) Impregnation of halide salts: immerse 30 g of activated carbon raw material in a potassium chloride solution with a mass concentration of 15 wt.%, stir for 4 hours, and filter and dry.

[0036] (3) Halogen loading: Put the activated carbon loaded with potassium chloride into the U-shaped tube to form a filling layer, and input 300mL / min air with chlorine gas from the top of the filling layer, the chlorine gas concentration is 0.13mg / L, and maintain it at room temperature for 10h. Chlorine gas molecules are evenly loaded into the micropores of activated carbon, and chlorine gas combines with potassium chloride to form thermally stable trichloride KCl 3 .

[0037] (4) The chlorine-loaded activated carbon was heated at 110°C for 1 hour to remove volatile halogens, and the f...

Embodiment 2

[0040] (1) Removal of surface chemical groups from raw materials: The coconut shell-based granular activated carbon raw material was washed with 30 wt.% NaOH solution and dried at 150 °C.

[0041] (2) Impregnation of halide salts: immerse 30 g of activated carbon raw material in potassium bromide solution with a mass concentration of 20 wt.%, stir for 12 hours, and filter and dry.

[0042] (3) Halogen loading: put the activated carbon loaded with potassium bromide in the U-shaped tube to form a filling layer, and input bromine from the top of the filling layer with 300mL / min air, the bromine concentration is 0.21mg / L, and maintain at room temperature After 10 hours, bromine molecules are evenly loaded into the micropores of activated carbon, and bromine combines with potassium bromide to form a thermally stable tribromide KBr 3 .

[0043] (4) The bromine-loaded activated carbon was heated at 110°C for 2 hours to remove volatile bromine, and a flue gas mercury-removing activat...

Embodiment 3

[0046] (1) Removal of surface chemical groups from raw materials: The coconut shell-based granular activated carbon raw material was washed with 30 wt.% NaOH solution and dried at 150 °C.

[0047] (2) Impregnation of halide salts: 50 g of activated carbon raw materials were impregnated in a potassium iodide solution with a mass concentration of 50 wt.%, stirred for 12 hours, and filtered and dried.

[0048] (3) Halogen loading: Put the activated carbon loaded with potassium iodide in the U-shaped tube to form a filling layer, and input iodine from the top of the filling layer with 300mL / min air, the iodine concentration is 0.23mg / L, maintain at room temperature for 10h, bromine Molecules are evenly loaded into the micropores of activated carbon, and bromine combines with potassium bromide to form thermally stable triiodide KI 3 .

[0049] (4) The iodine-loaded activated carbon was heated at 100°C for 1 hour to remove volatile iodine, and a flue gas mercury-removing activated ...

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Abstract

The invention provides a preparation method for flue gas mercury-removing active carbon. The preparation method comprises the following steps: step 1, removing a surface chemical group of a raw material: washing the particle active raw material with 10.wt%-30.wt% NaOH solution and drying the raw materials at 100-120 DEG C; step 2, immersing halide salt: mixing, immersing and agitating the raw material active carbon with an oxygen-containing group on the surface and a halide salt solution according to the mass ratio ranging from 1:1 to 1:5 for 4-12 hours; filtering and drying to obtain active carbon carrying the halide salt, wherein the concentration of the halide salt solution is 10wt.%-50wt.%; step 3, loading halogen: putting the active carbon carrying the halide salt into a U-shaped pipe to form a filling layer; inputting air with the halogen from the top of the filling layer at the speed of 100-500mL / min and keeping the heat for 1-10 hours at room temperature to obtain saturated halogen-loaded active carbon; and step 4, heating the saturated halogen-loaded active carbon at the temperature in a range of 80-120 DEG C to remove the volatile halogen to prepare the flue gas mercury-removing active carbon.

Description

[0001] technical field [0002] The invention belongs to the technical field of flue gas mercury removal activated carbon, in particular to a preparation method of highly efficient flue gas mercury removal activated carbon. [0003] Background technique [0004] Coal will still be the main energy source of electricity in the future, and the mercury pollution caused by coal-fired flue gas has become another major global ecological environmental problem after climate change. Mercury compounds and sulfur dioxide dust in coal combustion emissions are also the main causes of PM2.5 formation, which is the root cause of haze weather. At present, my country's coal consumption ranks first in the world. By 2020, China's coal power will still account for 72%, requiring about 2.7 billion tons of coal. It is estimated that by 2035, 43% of the world's electricity supply will still come from coal. During coal combustion, mercury evaporates and is discharged into the atmosphere with flue ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01D53/64B01D53/81
Inventor 孙康蒋剑春卢辛成邓先伦陈超贾羽洁
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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