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Treatment method of arsenic-containing flue gas

A flue gas treatment and flue gas treatment system technology, applied in the field of comprehensive utilization of resources, can solve the problems of difficult recycling of dearsenic lye, high cost, poor dearsenic effect, etc. The effect of low water consumption

Inactive Publication Date: 2020-11-03
CENT SOUTH UNIV
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Problems solved by technology

[0005] Aiming at the technical problems of poor arsenic removal effect and high cost in the treatment of arsenic-containing flue gas, and the difficulty in recycling the arsenic-containing lye, the purpose of the present invention is to provide a flue gas treatment system that uses high-pressure micro-mist spraying to realize the arsenic-containing High-efficiency arsenic removal from arsenic flue gas and a high-efficiency arsenic-alkali separation method using an arsenic-alkali separation circulation system. This method can not only reduce the arsenic content in arsenic-containing flue gas to the emission standard, but also realize the recycling of alkaline spray liquid , has the advantages of economy, high efficiency and environmental protection, which is conducive to the promotion and application in industry

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  • Treatment method of arsenic-containing flue gas
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Examples

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Effect test

Embodiment 1

[0028] Using the above method to treat arsenic-containing flue gas produced by a rare and precious metal smelter, the flue gas volume is 55000Nm 3 / h, the dust content of the flue gas is about 0.02g / Nm 3 , where As 2 o 3 The content is about 2.17%. Previously, the traditional spraying method was used, and the arsenic content in the final exhausted flue gas was about 5.8mg / m 3 , far below the smoke emission standards. According to the flue gas treatment method provided in this article, 10 micro-mist nozzles (including accident nozzles) are designed on the upper part of the flue gas tower with a diameter of 5.2m. After pressurization, the pressure at the nozzle of each nozzle reaches about 130 Bar, and the water volume is 0.5m 3 About / h, the initial concentration of sodium carbonate in the spray liquid is 100g / L, and after the spray liquid and flue gas interact, the confluence flows to the arsenic-alkali separation system. According to the arsenic content in the arsenic-co...

Embodiment 2

[0031] This example mainly compares the effect of the addition of hydrogen peroxide on the process index. Using the above method to treat arsenic-containing flue gas produced by a rare and precious metal smelter, the flue gas volume is 55000Nm 3 / h, the dust content of the flue gas is about 0.02g / Nm 3 , where As 2 o 3 The content is about 2.17%. Previously, the traditional spraying method was used, and the arsenic content in the final exhausted flue gas was about 5.8mg / m 3, far below the smoke emission standards. According to the flue gas treatment method provided in this article, 10 micro-mist nozzles (including accident nozzles) are designed on the upper part of the flue gas tower with a diameter of 5.2m. After pressurization, the pressure at the nozzle of each nozzle reaches about 130 Bar, and the water volume is 0.5m 3 About / h, the initial concentration of sodium carbonate in the spray liquid is 100g / L, and after the spray liquid and flue gas interact, the confluence...

Embodiment 3

[0034] This example mainly compares the influence of the number of micro-mist nozzles on the process index. Using the above method to treat arsenic-containing flue gas produced by a rare and precious metal smelter, the flue gas volume is 55000Nm 3 / h, the dust content of the flue gas is about 0.02g / Nm 3 , where As 2 o 3 The content is about 2.17%. Previously, the traditional spraying method was used, and the arsenic content in the final exhausted flue gas was about 5.8mg / m 3 , far below the smoke emission standards. According to the flue gas treatment method provided in this article, 10 micro-mist nozzles (including accident nozzles) are designed on the upper part of the flue gas tower with a diameter of 5.2m. In the comparative example, only 6 micro-mist nozzles are designed to work. The pressure at the nozzle of each nozzle reaches about 130Bar, and the water volume is 0.5m 3 About / h, the initial concentration of sodium carbonate in the spray liquid is 100g / L, and aft...

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Abstract

The invention discloses an arsenic-containing flue gas treatment method, which comprises the following steps: enabling arsenic-containing flue gas to enter the bottom of a flue gas absorption tower ofa high-pressure atomized flue gas treatment system, and carrying out countercurrent contact reaction on the arsenic-containing flue gas and dense micro-nano fog gas flow formed by spraying alkaline absorption liquid from the top of the flue gas absorption tower, so as to obtain arsenic-containing alkaline absorption liquid; enabling the the arsenic-containing alkaline absorption liquid to enter an arsenic-alkali separation system after being oxidized and to be subjected to a contact reaction with a metal complex ammonium ion solution, wherein struvite type metal ammonium arsenate precipitatesare generated, and after the precipitates are removed, feeding the residual liquid back to the high-pressure atomized flue gas treatment system to serve as the alkaline absorption liquid to be repeatedly used. According to the method, the arsenic component in the arsenic-containing flue gas can be efficiently removed, cyclic utilization of the alkaline spraying liquid can be achieved, and the purpose of efficient and economical treatment of the arsenic-containing smelting flue gas is achieved; in addition, the method is simple, rapid, efficient and low in cost, and industrial production is met.

Description

technical field [0001] The invention relates to a treatment method for arsenic-containing flue gas, in particular to a method for absorbing arsenic-containing flue gas by using a dense micro-nano mist flow and removing arsenate components in an alkaline spray solution by using a metal complexed ammonium ion solution The method belongs to the technical field of resource comprehensive utilization. Background technique [0002] During the non-ferrous metal pyro-smelting process, a large amount of highly toxic flue gas containing arsenic oxygen compounds will be produced. The arsenic-containing smelting flue gas needs to pass through the flue gas treatment system before being discharged to reduce the arsenic content in the flue gas to the acceptable range. [0003] At present, the more common arsenic-containing flue gas treatment method is to pass the flue gas into the purification combination tower, and absorb the arsenic component in the flue gas by spraying lye, and the alka...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/38B01D53/96
CPCB01D53/78B01D53/38B01D53/96B01D2251/304B01D2251/606B01D2258/0283
Inventor 韩海生田佳孙伟胡岳华王丽杨越孙磊刘若华谢建都张荥斐岳彤
Owner CENT SOUTH UNIV
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