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Absorbing liquid for mercury removal from flue gas containing mercury and method for removing mercury from flue gas containing mercury

A technology of mercury flue gas and absorbing liquid, applied in the field of pyrometallurgy flue gas treatment, can solve the problems of difficult to overcome influence, high cost of ionic liquid, high volatility, etc. The effect of saturated mercury absorption

Active Publication Date: 2019-04-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the insolubility of gaseous elemental mercury, it is difficult to remove it in the existing flue gas purification process
Most of the elemental mercury that cannot be removed volatilizes into the atmosphere, causing mercury pollution. Therefore, how to realize the removal of elemental mercury in flue gas and reduce mercury emissions is a key issue
[0004] Commonly used special mercury removal technologies at home and abroad mainly include calomel method, potassium iodide method, etc., but these methods have disadvantages such as high cost of mercury removal, inability to deal with low-concentration mercury-containing flue gas, etc.
At present, most smelting enterprises in my country do not have a special flue gas mercury removal process, and they all use the collaborative removal in the existing flue gas desulfurization and denitrification process, and the removal efficiency of elemental mercury is not high.
In addition, smelting flue gas also has high mercury content, large volatility, SO 2 High content and other characteristics, these make it difficult for existing processes to meet mercury emission standards
In order to meet mercury emission standards, Chinese patent (CN 103111182A) proposes a lime solution containing sodium hypochlorite to oxidize and absorb mercury, but it is difficult to overcome the high content of SO 2 Impact
At the same time, the Chinese patent (CN 103877844A) proposes a new type of mercury adsorption liquid mixed with imidazole ionic liquid and hydrogen peroxide, but the expensive cost of ionic liquid greatly limits its application

Method used

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  • Absorbing liquid for mercury removal from flue gas containing mercury and method for removing mercury from flue gas containing mercury
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  • Absorbing liquid for mercury removal from flue gas containing mercury and method for removing mercury from flue gas containing mercury

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The temperature of the flue gas used in this implementation is 45°C, and the main component content (volume) of the flue gas: SO 2 4%, O 2 5%, Hg 2+ 1mg / Nm 3 , and the rest are N 2 . Mercury adsorption solution washing composition: the content of thiourea compounds is 0.1mol / L, 0.2mol / L, 0.3mol / L respectively, the iodide ion content is 0.01mol / L, the pH of the washing solution is 2.0, and the content of dithioformamidine is 0.01mol / L, sodium stearate 0.001mol / L. The mercury-containing flue gas with a gas flow rate of 1L / min was injected into a scrubbing solution with a volume of 500mL to simulate the flue gas scrubbing process, and the reaction time was 60min. After washing, the removal effect of mercury in the flue gas is as follows: figure 1 shown. From figure 1 It can be seen from the figure that when the content of thiourea is 0.1mol / L, the removal efficiency of mercury adsorption solution to divalent mercury ions in flue gas is above 97%. With the increas...

Embodiment 2

[0036] The temperature of the flue gas used in this implementation is 35°C, and the main component content (volume) of the flue gas: SO 2 4%, O 2 5%, Hg 0 450μg / Nm 3 , CO 2 3%, the rest is N 2. Mercury adsorption solution washing composition: the content of thiourea compound is 0.2mol / L, the iodide ion content is 0.01mol / L, 0.02mol / L, 0.03mol / L respectively, the pH of the washing solution is 1.5, and the content of dithioformamidine is 0.01mol / L, sodium stearate 0.002mol / L. The mercury-containing flue gas with a gas flow rate of 0.6L / min was passed into a scrubbing solution with a volume of 500mL to simulate the flue gas scrubbing process, and the reaction time was 60min. After washing, the removal effect of mercury in the flue gas is as follows: figure 2 shown. From figure 2 It can be seen that the mercury adsorption solution has a high removal efficiency for elemental mercury. When the iodide ion content is 0.03mol / L and the dithioformamidine content is 0.015m...

Embodiment 3

[0037] The temperature of the flue gas used in this implementation is 25°C, and the main component content (volume) of the flue gas: SO 2 2%, O 2 6%, Hg 0 450μg / Nm 3 , CO 2 3%, the rest is N 2 . Mercury adsorption solution washing components: the content of thiourea compounds is 0.2mol / L, the iodide ion content is 0.01mol / L, the pH of the washing solution is 1.5, and the content of dithioformamidine is 0, 0.005mol / L, 0.01mol / L respectively L, 0.015mol / L, sodium stearate content is 0.002mol / L. The mercury-containing flue gas with a gas flow rate of 0.6L / min was passed into a scrubbing solution with a volume of 500mL to simulate the flue gas scrubbing process, and the reaction time was 60min. As a result, it was found that when dithioformamidine was not included in the solution, the removal efficiency of the washing solution to elemental mercury was only 64.5%, but after adding 0.005mol / L dithioformamidine in the solution, the removal efficiency of elemental mercury ro...

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Abstract

The invention discloses an absorption liquid for removing mercury from mercury fume and a mercury removal method for the mercury fume. The absorption liquid is prepared from components as follows: iodide ions, thiourea compounds, formamidine disulphide and sodium stearate, the mercury fume is contacted with the absorption liquid for a reaction, and elemental mercury and mercury in the oxidation state in the mercury fume enter the absorption liquid. Accordingly, elemental mercury and mercury in the oxidation state in the mercury fume are removed efficiently simultaneously, the absorption liquid is particularly applicable to processing of fume with high content of mercury, and the mercury removal efficiency is 90% or higher.

Description

technical field [0001] The present invention relates to an absorbing liquid for removing mercury from flue gas containing mercury and its application in removing mercury from flue gas containing mercury, in particular to a method for simultaneously removing elemental mercury and oxidized mercury from flue gas containing mercury based on the absorbing liquid , especially suitable for heavy metal smelting flue gas such as lead, zinc, copper, nickel, etc.; belongs to the technical field of pyrometallurgical flue gas treatment. Background technique [0002] Mercury pollution has become an environmental issue of increasing global concern due to its bioaccumulation, global spread, and high toxicity. In 2013, more than 80 countries, including China, signed the global Minamata Convention on Mercury, aiming to reduce global mercury emissions. my country is a large mercury emission country in the world, and strict restrictions on mercury emissions are inevitable. The non-ferrous met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/64
CPCB01D53/64B01D53/78B01D2251/108
Inventor 刘恢刘志楼彭兵柴立元王东丽杨姝闵小波
Owner CENT SOUTH UNIV
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