Method for co-processing arsenic sulfide slag and arsenic-containing smoke in copper smelting

Abstract

The invention relates to a method for co-processing arsenic sulfide slag and arsenic-containing smoke in copper smelting. The method comprises the following steps that copper, zinc, iron, arsenic and like enter a solution through normal-pressure acid leaching of arsenic-containing smoke, lead is recovered from leaching slag through a lead smelting system, copper in smoke acid leaching liquid is precipitated through sulfuration of the arsenic sulfide slag, ferrous sulfate is added into the solution after copper precipitation, high-stability scorodite is obtained through reaction under the condition of oxygen pressure, the loss of valuable metal in the arsenic precipitation process is small, and the arsenic-removed solution with few impurities can be directly fed to a zinc electrodeposition process to obtain electrodeposited zinc or evaporated and crystallized to obtain a zinc sulfate product. According to the method, the valuable metal recovery rate is high, operation is easy, the problems that the arsenic sulfide slag is low in value and difficult to treat are effectively solved through arsenic sulfide slag sulfuration copper precipitation, and efficient utilization of dangerous solid waste and harmless treatment of arsenic are achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for synergistic treatment of copper smelting arsenic sulfide slag and arsenic-containing smoke and dust. Background technique [0002] During the pyro-smelting process of copper, a large amount of arsenic-containing fumes will be produced. Arsenic-containing fume contains a large amount of copper, zinc, arsenic, etc. If it is not recycled, it will not only cause waste of resources, but also pollute the environment. At present, some metallurgical enterprises directly process the arsenic-containing fume in the form of stockpiling. Since the soot contains a large amount of soluble arsenic, direct stockpiling will cause serious pollution to the surrounding environment; as the content of arsenic in copper concentrate continues to increase, soot Returning to the smelting system as a raw material will not only cause a large amount of arsenic to accumulate, but a...

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Problems solved by technology

[0003] CN107904406A discloses a method for treating arsenic-containing smoke and dust by pyrolysis, so that copper is enriched in slag, and As 2 o 3 , Sn, Pb, Zn DC furnace soot is sent to the electric furnace for volatilization and reduction, arsenic is reduced to simple arsenic, and Sn, Pb, Zn enters the enriched slag and is sent to tin smelting. In this invention, there is incomplete separation of arsenic, enriched slag, and copper slag Subsequent processing is still a troublesome problem, and the efficient separation of valuable metals has not really been realized

CN110331300A discloses a method of treating arsenic-containing smoke and dust with copper smelting sewage acid, obtaining arsenic-containing leachate under the condition of oxygen pressure leaching, using sodium sulfide precipitation to obtain copper sulfide, and obtaining arsenic trioxide through reduction and crystallization of sulfur dioxide. About 10g / L, which will have a certain impact on the extraction of other metals in the later stage

CN110093510A uses low-temperature roasting to process arsenic-containing smoke and dust to obtain arsenic trioxide, uses atmospheric pressure acid leaching to obtain leaching solution for roasting slag, uses iron powder replacement to obtain sponge copper, and then uses oxygen pressure acid leaching for leaching slag to obtain indium-containing leaching solution and lead and tin slag. Finally, indium and electrodeposited zinc are obtained through zinc powder replacement and electrodeposition treatment. This invention has long process flow, complicated operation, high production cost, and low purity of arsenic trioxide, so post-processing is required.

Among them, dilute sulfuric acid leaching is the main method for leaching dust in most metallurgical enterprises, which can make copper, zinc, iron, arsenic and other elements in the dust enter the solution. Metallurgical enterprises usually use the method of adding iron powder to realize the replacement and decopper in the solution. , but there is a problem of large consumption of iron powder and high cost. At the same time, because the solution contains arsenic, arsine gas may be generated during the reduction process, which will deteriorate the working environment.

In the arsenic removal stage, although the traditional lime-iron salt method, sulfidation method, and lime neutralization method can effectively remove arsenic, the arsenic-containing solid waste after removal has poor stability and is prone to arsenic back-dissolution, posing safety hazards

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