Comprehensive recovery process for polymetallic arsenic-containing soot

Abstract

The invention provides a multi-metal comprehensive recovery process for arsenic-containing smoke dust. According to the process, leachate containing zinc and copper and leaching slag containing arsenic and lead are obtained through selective leaching, the leachate is extracted by respectively using a copper extraction agent and a zinc extraction agent, and then reverse extraction and electrodeposition are carried out so as to obtain copper and zinc; the leaching slag is leached with a mixed arsenic removing agent consisting of H2O2 and Na2S2O3 so as to obtain arsenic-containing leachate and lead-containing arsenic-removed leaching slag, the arsenic-containing leachate is concentrated and crystallized so as to obtain sodium arsenate, and the lead-containing arsenic-removed leaching slag is subjected to pyrogenic process lead extraction and electrolytic refining so as to obtain lead. According to the invention, the multi-metal comprehensive recovery process uses combined hydrometallurgy and pyrometallurgy, comprehensive recovery process and a main smelting system are effectively combined together, seamless butt joint of a part of technology and main process technology is realized, process steps are environment-friendly, metallic copper, zinc and lead are effectively recovered, and resourceful treatment of arsenic is realized.

Description

technical field

[0001] The invention relates to the field of nonferrous metal smelting, in particular to a comprehensive recycling process of arsenic-containing soot in the nonferrous metal smelting process. Background technique

[0002] my country is the largest producer of non-ferrous metals in the world, and the soot produced by non-ferrous metal pyrometallurgy reaches millions of tons every year. Due to the high temperature of pyro-smelting, low-melting metals such as arsenic, zinc, and lead contained in the concentrate also volatilize into the smoke and dust. These valuable metal elements are resources with considerable economic value. Every year in my country, hundreds of thousands of tons of arsenic are discarded in the form of arsenic-containing tailings and waste residues in the mining, dressing and smelting of copper, lead, zinc and other non-ferrous metals, resulting in a large amount of arsenic that pollutes the environment and even source of water, endangering h...

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