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Preparation method of flue gas adsorbent

An adsorbent and flue gas technology, which is used in the preparation of flue gas adsorbents and the field of heavy metal adsorbents, can solve the problems of single effective component for mercury removal, high preparation cost, and suboptimal mercury removal efficiency.

Inactive Publication Date: 2015-09-02
QINGDAO JINZHI HIGH NEW TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of precious metals, this technology has high preparation costs, and the effective component for mercury removal is single, and the mercury removal efficiency is not optimal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The collected fly ash was treated with supercritical water for 30 minutes to obtain fly ash and treated water treated with supercritical water, and then sulfur vapor was used for pre-adsorption treatment to obtain modified fly ash; 50g of fly ash, 15g of water glass, 10g of clay, and 1g of ferric oxide were mixed and stirred; the mixture was granulated and calcined at 300°C for 1 hour; the obtained granules were soaked and adsorbed in 1mol / L KI solution for 24h, and dried Finally, the smoke adsorbent A is obtained.

Embodiment 2

[0030] Treat the collected fly ash with supercritical water for 10 minutes to obtain supercritical water-treated fly ash and treated water, and then use sulfur vapor for pre-adsorption treatment to obtain modified fly ash; 30g of fly ash, 20g of water glass, 15g of clay, and 2g of copper oxide were mixed and stirred; the mixture was granulated and calcined at 200°C for 3 hours; the obtained particles were impregnated and adsorbed in 1mol / L KI solution for 12h, and dried to obtain Smoke sorbent B.

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PUM

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Abstract

The invention provides a preparation method of a flue gas adsorbent by taking modified coal ash as a main raw material. The coal ash is subjected to supercritical water treatment, and soluble substances in partial coal ash micro particles are dissolved, so that the micropores in the coal ash are expanded and improved; sulfuric vapor treatment is carried out, so that elemental sulfur in particle surfaces of the coal ash and partial micropore ducts can be pre-adsorbed, and sulfur can react with Hg<2+> and Hg<0> in the gas phase to generate mercuric sulfide, so that the adsorption capacity of an adsorbent is reinforced, and other additives are added so as to further improve the performance of the adsorbent. The adsorbent provided by the invention has good adsorption performance and regeneration capacity.

Description

technical field [0001] The invention belongs to the field of gas pollutant treatment, and relates to a method for preparing a flue gas adsorbent, especially a method for preparing an adsorbent for removing heavy metals such as mercury in flue gas of a thermal power plant by using the fly ash for recycling by using the fly ash of a thermal power plant . Background technique [0002] Coal is the most important energy source for the entire industry, and the pollutants produced by coal combustion, except SO and NO x and CO 2 In addition, there are various forms of mercury, and a large amount of mercury released into the atmosphere will cause direct or potential harm to human health. The average mass fraction of mercury in Chinese coal is 0.22 mg / kg. Due to the massive combustion of coal, the total amount of mercury released from coal combustion is more than 1590t every year, accounting for about 50% of the world's total. During the combustion of coal, the high temperature ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30B01D53/02
Inventor 不公告发明人
Owner QINGDAO JINZHI HIGH NEW TECH
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