A method for purifying elemental mercury in flue gas by using organic sulfide

A technology of sulfide and elemental mercury, which is applied in chemical instruments and methods, separation methods, and dispersed particle separation, etc., can solve the problems of decreased removal rate of elemental mercury, toxicity and corrosiveness, easy excess of hydrogen sulfide, etc. The effect of low ingredient requirements, simple ingredients and wide application range

Active Publication Date: 2021-06-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The activated carbon method mainly relies on the physical adsorption of elemental mercury in the flue gas, but the adsorption capacity is low; the raw materials used in the calomel method are toxic and corrosive, and the cost is high; the sulfuric acid method will produce a large amount of mercury-containing sulfuric acid, causing secondary pollution; vulcanization The sodium method uses sodium sulfide to generate highly toxic hydrogen sulfide gas in an acidic environment to oxidize elemental mercury, but the reaction generates hydrogen sulfide in excess; Released into the flue gas, resulting in a decrease in the removal rate of elemental mercury

Method used

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  • A method for purifying elemental mercury in flue gas by using organic sulfide

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Prepare a 2-mercaptobenzothiazole sodium washing solution with a concentration of 0.1mol / L. The simulated flue gas containing mercury (the gas composition is 250μg / m 3 Hg 0 , 2% SO 2 , 4%O 2 , and the rest are N 2 ) into 250 mL of washing liquid at a temperature of 25° C., the removal rate of elemental mercury is 97.5%.

Embodiment 2

[0034] Prepare a washing solution of trisodium thiocyanate with a concentration of 0.5 mol / L. The simulated flue gas containing mercury (the gas composition is 1000μg / m 3 Hg 0 , 10% SO 2 , 15%O 2 , and the rest are N 2 ) into 500 mL of washing liquid at a temperature of 60° C., the removal rate of elemental mercury is 98.4%.

Embodiment 3

[0040] Prepare a mixed washing solution of sodium 2-mercaptobenzothiazole and trisodium thiocyanate with a concentration of 0.15 mol / L. The simulated mercury-containing flue gas (gas composition is 600μg / m 3 Hg 0 , 0.1% SO 2 , 1%O 2 , and the rest are N 2 ) into 300 mL of washing liquid at a temperature of 10° C., the removal rate of elemental mercury is 98.0%.

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Abstract

The invention discloses a method for purifying elemental mercury in flue gas by using organic sulfide. 2 and SO 2 Under the synergistic effect of organic sulfide complexation and oxidation of elemental mercury in flue gas, elemental mercury is converted into organic sulfur-mercury complex precipitation. This method can realize efficient purification and separation of elemental mercury in flue gas. Elemental mercury The removal efficiency is more than 97%, the washing liquid has simple components, low cost and low equipment requirements, and can be applied to the treatment of various flue gases containing mercury.

Description

technical field [0001] The invention relates to a method for removing elemental mercury in flue gas, in particular to a method for converting elemental mercury into organic sulfur-mercury by using a small amount of oxygen and sulfur dioxide in flue gas to oxidize elemental mercury in flue gas through organic sulfide complexation The method for complex precipitation belongs to the technical field of mercury-containing flue gas treatment. Background technique [0002] Mercury is a heavy metal element with high biological toxicity, long-distance migration in the environment, and accumulation through the food chain. [0003] my country's "Pollutant Emission Standards for Thermal Power Plants (GB 13223-2011)" stipulates that the emission of mercury and its compounds from coal-fired boilers should be strictly limited to 0.03mg / m -3 Below; "Lead and Zinc Industrial Pollutant Discharge Standards (GB25466-2010)" stipulates that the emission of mercury and its compounds from lead and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/64B01D53/78
CPCB01D53/64
Inventor 刘恢陈志军陈昊沈锋华谢小峰刘操
Owner CENT SOUTH UNIV
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