Process for recovering valuable metals from high-iron alloys

Abstract

The invention discloses a process for recovering valuable metals from high-iron alloys. The process comprises the following steps: 1) the selective leaching of copper, cobalt and nickel: carrying out a leaching reaction on a crushed high-iron alloy by using a sulfuric acid-hydrochloric acid mixed solution with an acid concentration of 0.3-5 mol / L, wherein through the reasonable control over the selected liquid-solid ratio of 5:1-30:1 and the addition of an additive which can be ammonia salts, manganese salts, chloride and the like, Cu, Co and Ni in the alloy can come into the solution in an ion state, Fe in the alloy precipitates in a form of hematite or goethite, and the content of Fe<2+> and Fe<3+> in the obtained leaching liquid is less than 0.1g / L; 2) the selective extraction of copper: feeding the solution into a copper extraction system, and extracting copper by using hydroxamic copper extraction agents or commercially available other copper extraction agents, so that copper is separated and purified; 3) the electrolytic deposition of copper: carrying out reverse extraction on a copper-loaded extraction agent by using electrodeposition liquid, and carrying out electrodeposition so as to obtain a standard cathode copper plate; and 4) the separation and recovery of a solution containing nickel and cobalt. According to the process, the process flow can be greatly shortened and the production costs of copper and cobalt are greatly reduced.

Description

technical field [0001] The invention discloses a method for processing high-iron alloys in the field of hydrometallurgy and chemical industry, and relates to a process for recovering valuable metals from high-iron alloys. Background technique [0002] High-iron alloy is an alloy or metal compound containing not less than 3% iron and one or more valuable metals such as copper, nickel, cobalt, etc. [0003] The key issue in the wet treatment of high-iron alloys is the removal of impurity iron in the process of metal separation and purification. The process of the prior art is: the alloy particles are crushed to obtain finer alloy powder, and the alloy powder is oxidized and leached with sulfuric acid medium, so that all soluble metal components such as copper, nickel, cobalt in the alloy enter the solution in the form of ions, especially the impurity iron also All go into the leachate. After that, the leaching solution enters the Cu extraction and electrolysis system to obta...

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Problems solved by technology

The shortcoming of above-mentioned traditional treatment method is, the one, can not fully leach copper sulfide composition in the alloy, and the direct recovery rate of copper is low; It is the enrichment of Fe in the electrolyte, which reduces the current efficiency of copper electrowinning; the fourth is that the removal of iron from the Cu raffinate needs to consume a large amount of alkali, oxidant and energy, and the cost of iron removal is very high

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