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Novel method for purifying and recycling arsenic-containing flue gas by using acidic liquid medium

A technology of liquid medium and new method, applied in chemical instruments and methods, separation methods, gas treatment and other directions, can solve the problems of reduced overall treatment effect, unsatisfactory gravity dust removal effect, and limited guiding significance of flue gas purification, etc. The effect of less heavy metal enrichment, reducing the production of polluted acid and avoiding the generation of polluted acid

Pending Publication Date: 2021-02-23
CHUXIONG DIANZHONG NON FERROUS METALS LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN105126587A reports the method of ultra-gravity flue gas dedusting and purifying 2 flue gas, but the effect of gravity dedusting is not very ideal, which reduces the overall treatment effect of the process
Chinese patent CN102079511B reports an acid system suitable for high-concentration sulfur dioxide flue gas, but it does not specify SO 2 The concentration limit of the concentration limit has limited guiding significance for flue gas purification

Method used

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  • Novel method for purifying and recycling arsenic-containing flue gas by using acidic liquid medium
  • Novel method for purifying and recycling arsenic-containing flue gas by using acidic liquid medium
  • Novel method for purifying and recycling arsenic-containing flue gas by using acidic liquid medium

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Effect test

Embodiment 1

[0025]The washing solutions prepared in this embodiment are shown in Table 1.

[0026] Table 1 Washing Solution Components

[0027]

[0028] A new method for purifying arsenic-containing flue gas with an acidic liquid medium and recycling it, the specific steps are as follows:

[0029] (1) Add sulfuric acid to the flue gas washing water to prepare an acid medium solution, so that the concentration of sulfuric acid accounts for 50% of the total concentration of the washing solution.

[0030] (2) Adding an auxiliary additive with a mass ratio of 0.1% in the washing solution to enhance the washing effect; wherein the added auxiliary additive is activated carbon.

[0031] (3) Use the cold solution of the prepared washing solution to spray the flue gas (the flue gas to be deeply purified before entering the flue gas acid production), the reaction temperature is room temperature, and the flue gas is washed by countercurrent gas-liquid phase contact Purification; the flue gas pu...

Embodiment 2

[0043] The washing solutions prepared in this embodiment are shown in Table 5.

[0044] Table 5 Acidic liquid medium composition

[0045]

[0046] A new method for purifying arsenic-containing flue gas with an acidic liquid medium and recycling it, the specific steps are as follows:

[0047] (1) Add sulfuric acid to the flue gas washing water to prepare an acidic medium solution, so that the concentration of sulfuric acid accounts for 100% of the total concentration of the washing solution.

[0048] (2) Adding an auxiliary additive with a mass ratio of 1% in the washing solution to enhance the washing effect; wherein the added auxiliary additive is ceramic porous particles.

[0049] (3) Use the prepared acidic liquid medium cold solution to spray the flue gas (the flue gas to be deeply purified before entering the flue gas acid production), the reaction temperature is 350 ° C, and the flue gas is subjected to countercurrent gas-liquid contact. Washing and purification; th...

Embodiment 3

[0061] The concentration of sulfuric acid prepared in this embodiment is as shown in Table 9.

[0062] Table 9 Acidic liquid medium composition

[0063]

[0064] A new method for purifying arsenic-containing flue gas with an acidic liquid medium and recycling it, the specific steps are as follows:

[0065] (1) Add sulfuric acid to the flue gas washing water to prepare an acidic medium solution, so that the concentration of sulfuric acid accounts for 75% of the total concentration of the washing solution.

[0066] (2) Adding an auxiliary additive with a mass ratio of 0.5% in the washing solution to enhance the washing effect; wherein the added auxiliary additive is graphite particles.

[0067] (3) Use the prepared acidic liquid medium cold solution to spray the flue gas (the flue gas to be deeply purified before entering the flue gas acid production), the reaction temperature is 150 ° C, and the flue gas is subjected to countercurrent gas-liquid contact. Washing and purifi...

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Abstract

The invention relates to a novel method for purifying and recycling arsenic-containing flue gas by using an acidic liquid medium, belonging to the technical field of heavy metal pollution treatment. According to the invention, water washing in an acid making process is replaced with acid pickling, so heavy metal ions can be effectively enriched, acid recycling is achieved, and the method is suitable for heavy non-ferrous metal smelting flue gas purification and arsenic pollution treatment. After heavy non-ferrous smelting flue gas is subjected to gravity dust collection and electric dust collection, a part of auxiliary additives are added into an acid medium solution containing sulfuric acid to prepare a proper washing solution before the heavy non-ferrous smelting flue gas enters an acidmaking link, the flue gas is subjected to spraying or spray washing, sulfuric acid and heavy metal are recycled through concentration of mixed liquid obtained after washing, and meanwhile, a fluorineand chlorine removing agent is added to remove fluorine and chlorine. The acidic liquid medium is used for replacing water washing to purify SO2 flue gas, so generation of waste acid can be avoided, arsenic and heavy metal elements are effectively recycled, and soluble sulfur oxide in SO2 flue gas is fully utilized and recycled, so the method is of important significance in arsenic pollution treatment in the heavy non-ferrous metal smelting industry.

Description

technical field [0001] The invention relates to a new method for purifying arsenic-containing flue gas with an acidic liquid medium and recycling it, and belongs to the technical field of heavy metal pollution control. Background technique [0002] Arsenic is an element often encountered in heavy metal smelting. The toxicity of arsenic compounds is very strong, so a large amount of arsenic-containing fumes, slag, waste water and arsenic-containing intermediate products produced during the smelting process cause serious pollution to the environment and directly affect the health of operators and the people. Due to the limited use of arsenic and its compounds in the national economy, the timely treatment of various arsenic-containing materials in smelters is limited, resulting in a vicious circle of arsenic in the production system, or the stockpiling and backlog of a large number of arsenic-containing materials, which affects both Among them, the comprehensive recovery of va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50B01D53/64B01D53/96B01D50/00C02F9/10F27D17/00C02F103/18
CPCB01D53/78B01D53/50B01D53/64B01D53/96B01D50/00C02F1/04C02F1/583C02F1/58F27D17/008B01D2258/0283C02F2103/18Y02P10/25
Inventor 舒波王华刘大方祝星周尚祁先进张宝辉陈习堂黄健光李斌李雪琼杨益芬
Owner CHUXIONG DIANZHONG NON FERROUS METALS LLC
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