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Application of metal sulfide mercury removal agent in washing removal of mercury in flue gas

A metal sulfide and mercury removal agent technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of corrosion of mercury removal solution, secondary pollution of the environment, and lower mercury removal efficiency, and achieve anti-corrosion Excellent water properties, good mechanical properties, and high mercury removal efficiency

Pending Publication Date: 2020-06-26
CENT SOUTH UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

Although the solution absorption mercury removal method has a good mercury removal effect, the mercury removal solution is generally corrosive and easily saturated, causing serious environmental pollution, high operating costs, and high requirements for equipment; the oxidation in the mercury removal solution Mercury (Hg 2+ ) is easily reduced to gaseous elemental mercury (Hg 0 ), resulting in the reduction of mercury removal efficiency and the secondary pollution of the environment

Method used

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  • Application of metal sulfide mercury removal agent in washing removal of mercury in flue gas

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Using equimolar amounts of ammonium sulfide and copper chloride as reactants, a metal sulfide mercury removal agent 1 was prepared by hydrothermal method in the presence of cetyltrimethylammonium bromide. The specific surface area of ​​mercury removal agent 1 was 34.3m 2 / g. Add the metal sulfide mercury removal agent to the simulated flue gas scrubber, the set temperature of the cleaning liquid is 25°C, and the ratio of the added amount of the metal sulfide mercury removal agent to the cleaning liquid is 1kg / m 3 , the pH of the simulated washing solution is 2. Use the VM-3000 mercury detector to measure the mercury concentration in real time. The mass flow meter accurately controls the gas flow of each component to simulate the composition of the flue gas. The total gas flow is 1L / min, and the initial Hg 0 The concentration is 100±1μg / m 3 , in pure N 2 Under atmosphere, within 10h, the effect of metal sulfide mercury removal agent on Hg 0 The removal efficiency is ...

Embodiment 2

[0036] A metal sulfide mercury removal agent was prepared by a simple precipitation method in the presence of dodecyldimethylbenzylammonium bromide using ammonium sulfide, ferric chloride and copper chloride in a molar ratio of 2:1:1 as reactants 2. The specific surface area of ​​mercury removal agent 2 is 20.3m 2 / g. Add the metal sulfide mercury removal agent to the simulated flue gas scrubber, the set temperature of the cleaning liquid is 25°C, and the ratio of the added amount of the metal sulfide mercury removal agent to the cleaning liquid is 1kg / m 3 , the pH of the simulated washing solution is 7. Use the VM-3000 mercury detector to measure the mercury concentration in real time. The mass flow meter accurately controls the gas flow of each component to simulate the composition of the flue gas. The total gas flow is 1L / min, and the initial Hg 0 The concentration is 100±1μg / m3, in pure N 2 Under atmosphere, within 10h, the effect of metal sulfide mercury removal agent ...

Embodiment 3

[0038] Using ammonium sulfide and copper chloride with a molar ratio of 1:1 as reactants, the metal sulfide mercury removal agent 3 was prepared by titration method, and the specific surface area of ​​mercury removal agent 3 was 5.77m 2 / g. Add the metal sulfide mercury removal agent to the simulated flue gas scrubber, the set temperature of the washing liquid is 25°C, and the ratio of the metal sulfide mercury removal agent to the washing liquid is 5kg / m 3 , the pH of the simulated washing solution is 2. Use the VM-3000 mercury detector to measure the mercury concentration in real time. The mass flow meter accurately controls the gas flow of each component to simulate the composition of the flue gas. The total gas flow is 1L / min, and the initial Hg 0 The concentration is 100±1μg / m 3 , in pure N 2 Under atmosphere, within 10h, the effect of metal sulfide mercury removal agent on Hg 0 The removal efficiency was 85.2%.

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Abstract

The invention discloses an application of a metal sulfide mercury removal agent in washing removal of mercury in flue gas. The metal sulfide mercury removal agent is used as a mercury removal medium,the mercury removal agent is added into a flue gas washing device or a wet dust removal device to form a suspension, the suspension makes full contact with elemental mercury (Hg<0>) in flue gas, and mercury is converted into stable mercury sulfide, so efficient removal of the elemental mercury (Hg<0>) in the flue gas is achieved. The mercury removal agent adopted by the invention has the advantages of high mercury removal efficiency, simple synthesis method, accessible raw materials, lower cost, favorable mechanical properties, favorable acid resistance, favorable water resistance and favorable SO2 resistance, is simple in technical operation, and does not change the production process or the existing pollutant control system. Components of the mercury removal agent are similar to those ofsmelting raw materials, and the mercury removal agent obtained after mercury is recycled can be used as a metallurgical raw material, so secondary pollution is avoided, and the mercury removal agenthas wide market application prospects.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution prevention and purification, and specifically relates to the application of a metal sulfide mercury removal agent in cleaning and removing mercury in flue gas. Background technique [0002] Mercury is an environmental pollutant with high toxicity, high corrosiveness, high volatility, bioaccumulation and easy migration and diffusion. The "mercury sources" in nature mainly include natural sources and man-made sources. According to the latest 2018 global mercury pollution report released by the United Nations Environment Program (UNEP), more than 2,500 tons of mercury are emitted in the atmosphere due to human activities per year, accounting for More than 80% of the total mercury emissions in China, mainly including mercury emissions from metallurgical industries, combustion of fossil fuels, cement production, petrochemicals, waste disposal and other industries. In August 2017, the M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/64B01D53/78
CPCB01D53/78B01D53/64
Inventor 李海龙孟凡悦杨建平屈文麒
Owner CENT SOUTH UNIV
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