Method for potential controlled selection separation of copper refinery ash

Abstract

The invention relates to a method for potential controlled selection separation of copper refinery ash. The copper refinery ash is screened and then subjected to oxidizing leaching in a sulfuric acid system. An oxidizing agent is added to control the metal ion mixed potential of slurry, copper, arsenic, zinc and other metal are dissolved into a solution, and lead, bismuth and other metal precipitate and enter leaching residues. The metal ion mixed potential and the pH value of a leachate are simultaneously controlled, so that copper sulfide concentrate is produced through precipitation. The metal ion mixed potential and the pH value of copper-removed liquid are simultaneously controlled, so that arsenic sulfide products are produced through precipitation. The metal ion mixed potential and the pH value of arsenic-removed liquid are simultaneously controlled, so that zinc sulfide concentrate is produced through precipitation. Zinc-removed liquid is subjected to wastewater treatment and then discharged after reaching the standard. According to the method, the potential controlled oxidizing leaching and potential controlled sulfide precipitation ways are simultaneously adopted for recovering valuable metal step by step, the selection separation effect, which cannot be achieved by independently using the ways, of the valuable metal in the copper refinery ash is achieved, and the leaching rates of copper, arsenic and zinc are larger than 98.0%.

Description

technical field [0001] The invention relates to a hydrometallurgical process in the field of nonferrous metallurgy, in particular to a hydrometallurgical method for separating valuable metals in copper soot by means of a combination of potential-controlled oxidation leaching and sulfidation precipitation. Background technique [0002] Copper is a rose-red heavy non-ferrous metal. Its excellent physical and chemical properties are widely used in various fields such as electrical, national defense, light industry, machinery manufacturing and construction. It is second only to aluminum in the consumption of non-ferrous metal materials in my country. . At present, the general use ratio of copper is as follows: 48-49% in the electrical industry, 19-20% in the communication industry, 14-16% in construction, 7-10% in transportation, and 7-9% in home appliances and others. In 2014, the output of ten non-ferrous metals in my country was 44.17 million tons, including 24.38 million ton...

AI Technical Summary

Problems solved by technology

[0006] Comparing these copper soot treatment processes comprehensively, the pyrotechnic process has been gradually replaced due to the influence of the operating environment and environmental pollution, and the combined pyrotechnic-wet process has gradually become the main body of the existing treatment process, but the process is long and the energy consumption is high. It is also transitioning to the wet process. The wet process has been applied industrially, but the existing process still has problems such as difficulty in As damage treatment, incompleteness, high equipment requirements, and low economic benefits.

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