Method for purifying and recycling mercury in flue gas

A recovery method and flue gas technology, applied in combustible gas purification, chemical instruments and methods, combustible gas purification/transformation, etc., can solve the problems of repeated recycling of adsorbents, slow desorption speed, and low desorption rate , to achieve the effect of improving desorption regeneration performance, improving adsorption performance, and simple process

Inactive Publication Date: 2011-09-21
CHINA UNIV OF MINING & TECH (BEIJING)
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AI Technical Summary

Problems solved by technology

[0007] According to literature research, the mercury adsorption capacity of activated carbon is low (1g activated carbon adsorbs 1-4 mg mercury), the desorption speed is slow, and the desorption rate is low. For example, after 27 hours of thermal desorption, there is still a large amount of mercury remaining in activated carbon.
The regeneration performance of activated carbon mercury adsorbent is poor, which is far from meeting the requirements of repeated recycling of adsorbent. These unfavorable factors greatly limit its development.

Method used

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  • Method for purifying and recycling mercury in flue gas
  • Method for purifying and recycling mercury in flue gas
  • Method for purifying and recycling mercury in flue gas

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0047] (1) Soak the activated carbon fiber in a phosphoric acid solution with a mass fraction of 15% for 12 hours, then take it out and dry it for later use.

[0048] (2) Place the dried activated carbon fibers in a low-temperature plasma reactor, use nitrogen as a protective gas at 25°C, apply a voltage of 30kV, activate with low-temperature plasma for 30min, and then stop powering on.

[0049] (3) The specific surface area of ​​activated carbon fiber before and after activation is 1200 and 1450m respectively 2 / g.

[0050] (4) The activated activated carbon fibers were soaked and cleaned with deionized water to remove residual acid and other substances, and then put into an oven and dried at 105° C. for 2 hours.

[0051] (5) Prepare 500 mL of silver nitrate solutions with mass concentrations of 0.1, 0.2, 0.3 and 0.5 mg / mL by constant volume method, and place them in brown glass bottles for sealed storage. Weigh 4g ACF (specific surface area is about 1000m 2 / g of viscose-...

specific Embodiment 2

[0071] (1) Soak the activated carbon fiber in a phosphoric acid solution with a mass fraction of 35% for 12 hours, then take it out and dry it for later use.

[0072] (2) Place the dried activated carbon fibers in a low-temperature plasma reactor, use nitrogen as a protective gas at 25°C, apply a voltage of 30kV, activate with low-temperature plasma for 30min, and then stop powering on.

[0073] (3) The specific surface area of ​​activated carbon fiber before and after activation is 1200 and 1500m 2 / g.

[0074] (4) The activated activated carbon fibers were soaked and cleaned with deionized water to remove residual acid and other substances, and then put into an oven and dried at 105° C. for 2 hours.

[0075] (5) Prepare 500 mL of silver nitrate solutions with mass concentrations of 0.1, 0.2, 0.3 and 0.5 mg / mL by constant volume method, and place them in brown glass bottles for sealed storage. Weigh 4g ACF (specific surface area is about 1000m 2 / g of viscose-based activat...

specific Embodiment 3

[0088] (1) Soak the activated carbon fiber in a phosphoric acid solution with a mass fraction of 35% for 24 hours, then take it out and dry it for later use.

[0089] (2) Place the dried activated carbon fibers in a low-temperature plasma reactor, use nitrogen as a protective gas at 25°C, apply a voltage of 30kV, activate with low-temperature plasma for 30min, and then stop powering on.

[0090] (3) The specific surface area of ​​activated carbon fiber before and after activation is 1200 and 1550m respectively 2 / g.

[0091] (4) The activated activated carbon fibers were soaked and cleaned with deionized water to remove residual acid and other substances, and then put into an oven and dried at 105° C. for 2 hours.

[0092] (5) Prepare 500 mL of silver nitrate solutions with mass concentrations of 0.1, 0.2, 0.3 and 0.5 mg / mL by constant volume method, and place them in brown glass bottles for sealed storage. Weigh 4g ACF (specific surface area is about 1000m 2 / g of viscose-...

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Abstract

The invention relates to a method for purifying and recycling mercury in flue gas, wherein the method is applicable to mercury desorption from coal-fired flue gas, and mercury purification and recycling from mercury-contained flue gas in nonferrous industries and belongs to the fields of atmospheric pollution control technologies and heavy metal pollution control. The method comprises the following steps: immerging activated carbon fiber in a 15-45wt% phosphoric acid solution or zinc chloride solution or ammonium salt solution for 12-24 hours, and then taking out the immerged activated carbonfiber, and airing the immerged activated carbon fiber for standby; adding the dried activated carbon fiber into a prepared 0.001-1 mg/L sliver-contained ion solution, agitating for 4-24 hours in a thermostatic water bath, filtering out the solution, flushing the activated carbon fiber repeatedly by using de-ionized water, filtering out the solution, flushing the activated carbon fiber repeatedly by using distilled water, and then drying the flushed activated carbon fiber at 50-105 DEG C in vacuum; regenerating the activated carbon fiber by using low-temperature plasma after the prepared silver-loaded activated carbon fiber is saturated with adsorbed mercury; and further recycling the volatilized mercurial vapor which enters a condenser, and flows back to a storage tank after being condensed. The method for purifying and recycling the mercury in the flue gas has the effects of rapidness, high efficiency, and low loss of carbon for the mercury desorption; and in addition, the mercurial vapor is reused by means of condensation and recycling.

Description

technical field [0001] The invention relates to a method for purifying and recovering mercury in flue gas, which is applicable to the removal of mercury in coal-fired flue gas and the purification and recovery of mercury in mercury-containing flue gas in non-ferrous industries, and belongs to the fields of air pollution control technology and heavy metal pollution control. Background technique [0002] The international community tends to believe that China is one of the countries with the most serious mercury emissions, and the contribution rate of anthropogenic mercury emissions from the nonferrous metal industry and coal combustion process exceeds 70%. Therefore, how to effectively reduce and control mercury emissions in flue gas has become a huge pressure that my country's social and economic development will face. [0003] For the control of mercury emissions in flue gas, researchers have proposed various control methods, including adsorption methods represented by acti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/04B01D5/00B01J20/34B01J20/20
Inventor 竹涛何绪文徐志强万艳东李海蓉
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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