Method and system for treating arsenic-containing metallurgical off-gas

Abstract

The invention discloses a method and a system for treating arsenic-containing metallurgical off-gas. The method comprises the following steps: smelting arsenic-containing concentrate to obtain a smelted product and the metallurgical off-gas; adopting sulfuric acid with a mass concentration of 55-63% to elute the metallurgical off-gas, so as to absorb arsenic oxide in the metallurgical off-gas; when the arsenic oxide is supersaturated and separated out, performing solid-liquid separation to the sulfuric acid containing arsenic oxide, so as to obtain arsenic oxide and the eluted sulfuric acid. The method disclosed by the embodiment of the invention can be used for treating the arsenic-containing metallurgical off-gas with high dust concentration, high smoke composition and concentration fluctuation, high dust cementation capacity, and high sulfur content in the off-gas, so as to improve the treatment effect in the prior art.

Description

technical field [0001] The invention belongs to the field of smelting flue gas treatment, in particular, the invention relates to a treatment method and system for arsenic-containing smelting flue gas. Background technique [0002] At present, the treatment of arsenic-containing smelting flue gas mainly adopts the method of collecting arsenic in cloth bags, but because smelting flue gas, especially smelting flue gas, has high dust concentration, large fluctuations in flue gas composition and concentration, strong dust binding ability, and sulfur in flue gas (especially sulfur trioxide) high content makes it easy to cause bag corrosion and serious clogging when using bag arsenic collection treatment, and the treatment effect is not ideal. At the same time, arsenic and other metals will be collected at the same time, which makes it difficult to separate arsenic. In order to solve the technical problem of difficult separation of arsenic in the method of bagging arsenic in the ...

AI Technical Summary

Problems solved by technology

[0002] At present, the treatment of arsenic-containing smelting flue gas mainly adopts the method of collecting arsenic in cloth bags, but because smelting flue gas, especially smelting flue gas, has high dust concentration, large fluctuations in flue gas composition and concentration, strong dust binding ability, and sulfur in flue gas (especially sulfur trioxide) content is high, making it easy to cause bag corrosion and serious clogging when using bag arsenic collection treatment, and the treatment effect is not ideal

At the same time, arsenic and other metals will be collected at the same time, making it difficult to separate arsenic

In the related technology, in order to solve the technical problem of difficult separation of arsenic in the method of collecting arsenic in cloth bags, the method of cooling the smelting flue gas in stages is adopted, and the arsenic is collected at the end, so as to achieve the purpose of separating it from other metals

However, a large amount of sulfur trioxide, sulfur dioxide and other gases contained in the smelting flue gas will still cause corrosion to the bag and reduce the life of the bag

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