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Regeneration method of flue-gas demercuration absorbent

An adsorbent, mercury removal technology, applied in separation methods, filter regeneration, chemical instruments and methods, etc., can solve the problems of mercury adsorbent inactivation, intractability, secondary pollution, etc.

Active Publication Date: 2015-03-25
浙江大业新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, due to the physical adsorption and chemical adsorption of mercury adsorbent, some of the adsorbed mercury is gaseous mercury (Hg 0 ) and particulate mercury (Hg p ), these two components are difficult to further process in the adsorbent, thus causing the gradual deactivation of the mercury adsorbent, and the improper handling of mercury in the deactivated mercury adsorbent will cause new secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The deactivated adsorbent 1b was obtained after the mercury removal adsorbent 1a was operated for 1000 hours;

[0026] The deactivated adsorbent 1b is regenerated, and the steps of regeneration include: a) washing the deactivated adsorbent with a hydrogen peroxide solution with a mass concentration of 10%; b) treating the reacted mercury adsorbent with supercritical water, washing to remove the adsorbed Mercury; c) the aqueous solution obtained by further processing step b) with sodium sulfide solution to obtain a mercury sulfide precipitate, and reclaim the mercury sulfide precipitate; d) the adsorbent is activated by immersion in a ferric chloride solution whose concentration is 1mol / L; e) drying After calcination for 1 hour, the regenerated adsorbent 1c was obtained.

Embodiment 2

[0028] The deactivated adsorbent 2b was obtained after the mercury removal adsorbent 2a was operated for 1000 hours;

[0029] The deactivated adsorbent 2b is regenerated, and the steps of regeneration include: a) washing the deactivated adsorbent with a hydrogen peroxide solution with a mass concentration of 10%; b) treating the reacted mercury adsorbent with supercritical water, washing to remove the adsorbed Mercury; c) the aqueous solution obtained by further processing step b) with potassium sulfide solution to obtain mercuric sulfide precipitation, and reclaim the mercuric sulfide precipitation; d) the adsorbent is activated by immersion in the ferric chloride solution whose concentration is 3mol / L; e) drying After post-calcination for 3 hours, the regenerated adsorbent 2c was obtained.

[0030] The adsorbent before deactivation, the adsorbent after deactivation, and the adsorbent after regeneration were investigated respectively. 3The simulated flue gas was verified to ...

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PUM

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Abstract

The invention discloses a regeneration method of a flue-gas demercuration absorbent composition. The regeneration method comprises the following steps: (a) washing an inactivated absorbent by using hydrogen peroxide solution, removing impurities such as flying ash on the surface of the absorbent, and converting elemental mercury absorbed on the surface of the absorbent into mercury in an oxidation state; (b) treating reacted mercury absorbent by using supercritical water and washing out the mercury absorbed; (c) further treating aqueous solution obtained in the step (b) by using sulfide solution, so as to obtain mercuric sulfide precipitate, and recovering the mercuric sulfide precipitate; (d) dipping and activating the absorbent in ferric chloride solution with the concentration being 1-3mol / L; and (e) drying, then roasting for 1-3 hours, thus obtaining the regeneration absorbent. The regeneration method disclosed by the invention is applicable to regeneration of the modified-metal-oxide-based mercury absorbent, and the recovery of the absorbing performance of the regenerated absorbent is good, so that the service life of the absorbent is prolonged and the economic and social benefits are good.

Description

technical field [0001] The invention belongs to the field of gas pollutant treatment, in particular to the adsorption of heavy metals such as mercury in coal combustion flue gas, and relates to a regeneration method for a flue gas mercury adsorbent, in particular to a regeneration method for a composite metal oxide mercury adsorbent. 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 0.22mg / 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 gasifies the mercury in...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/34B01D53/86B01D53/64
CPCB01D53/02B01D53/64B01D53/8665B01D2253/25B01J20/20B01J20/28B01J20/345B01J20/3483
Inventor 不公告发明人
Owner 浙江大业新材料股份有限公司
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