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Stable suspension system for removing mercury in flue gas and recovery method of suspension system

A stable and systematic technology, applied in gas treatment, separation methods, chemical instruments and methods, etc., to achieve huge environmental benefits, avoid re-release, and long-lasting effects

Active Publication Date: 2021-05-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings and existing problems of the existing mercury removal methods, the object of the present invention is to provide a stable suspension system for removing mercury in flue gas and its recovery method

Method used

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  • Stable suspension system for removing mercury in flue gas and recovery method of suspension system
  • Stable suspension system for removing mercury in flue gas and recovery method of suspension system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] At 25°C, add 1mL of neat polysiloxane additives with a viscosity of 500Pa.s to 100mL of washing liquid and stir, then add the synthesized copper sulfide to the washing liquid and stir at high speed for pretreatment. The temperature of the stable suspension system is 25°C, and the acidity is pH=7. A mercury meter is used 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. Initial Hg 0 The concentration is 1000±1μg / m 3 , in pure N 2 Under the atmosphere, within 48h, the suspension system has a 0 The removal efficiency is 98.1%. Using petroleum ether as an organic solvent to recover and separate the suspension system can realize the separation of polysiloxane additives and copper sulfide, and petroleum ether and polysiloxane additives can be recycled.

Embodiment 2

[0050] Add 1mL polysiloxane additive recovered from Example 1 to 100mL washing solution at 50°C and stir, then add the synthesized copper sulfide to the washing solution with high-speed stirring for pretreatment. The temperature of the stable suspension system is 5°C, and the acidity is pH=7. A mercury meter is used 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. Initial Hg 0 The concentration is 1000±1μg / m 3 , in a simulated flue gas atmosphere of 10% SO 2 , N 2 As a carrier gas, within 48 hours, the suspension system will 0 The removal efficiency is 97.3%. Using the petroleum ether recovered in Example 1 as an organic solvent to recover and separate the suspension system can realize the separation of polysiloxane additives and copper sulfide, and petroleum ether and polysiloxane additives can be recycled.

Embodiment 3

[0052] Add 0.05mL of neat polysiloxane additives with a viscosity of 100000Pa.s to 100mL washing liquid and stir at 20°C, then add synthetic iron sulfide to the washing liquid and stir at high speed for pretreatment. The temperature of the stable suspension system is 100°C, the acidity is 4mol / L sulfuric acid, and the mercury concentration is measured in real time with a mercury meter. 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 , initial Hg 0 The concentration is 100±1μg / m 3 , in pure N 2 Under the atmosphere, within 96h, the suspension system has a 0 The removal efficiency is 99.3%. The separation of iron sulfide can be realized by using the petroleum ether recycled twice as an organic solvent to recover and separate the suspension system, and the petroleum ether can be recycled.

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Abstract

The invention discloses a stable suspension system for removing mercury in flue gas and a recovery method of the suspension system. Metal sulfur, a selenide mercury removal agent and an additive are pretreated to form a stable suspension, the mercury-containing flue gas is in contact with the suspension, gaseous mercury (Hg0) is converted into stable mercuric sulfide or mercury selenide, and efficient removal of gaseous mercury in the flue gas is achieved. According to the method, existing pollutant control systems in various industries can be utilized, and the cost is low; the suspension system is simple to recover and separate and can be recycled; mercury can be recycled as a product; and the market prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of flue gas pollution control and purification, and in particular relates to a stable suspension system for removing mercury in flue gas and a recovery method thereof. Background technique [0002] Mercury and its compounds are highly toxic, persistent, highly corrosive, volatile, global migration and accumulation in organisms, and cause serious harm to human health and the ecological environment. It is recognized by the United Nations Environment Program (UNEP ) as a global pollutant. The Minamata Convention on Mercury came into effect in more than 100 countries around the world on August 16, 2017, marking that the use and discharge of mercury will be strictly controlled globally, and the reduction of mercury pollutant emissions has become the consensus of the international community . [0003] Gaseous elemental mercury (Hg 0 ) is the main form of mercury, its melting point is low, its volatility is high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/64
CPCB01D53/64B01D53/78B01D2257/602
Inventor 李海龙孟凡悦杨建平屈文麒杨泽群
Owner CENT SOUTH UNIV
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