A kind of selective separation method of copper and iron in sulfuric acid system cobalt leaching solution

Abstract

The invention discloses a selective separation method of copper and iron in sulphuric acid system cobalt leachate, and belongs to the technical field of purifying and separating a valuable metal solution regenerated from non-ferrous metals through hydrometallurgy. The method comprises the following process steps: 1) performing cyclone electrowinning on the copper-cobalt-iron-containing sulphuric acid system leachate to separate copper; 2) adding a sodium carbonate solution or limestone slurry in the cyclone electrowinning separation process to regulate the pH value; 3) forming compound co-precipitate by iron ions in different valence states in the solution when the pH value of the electrowinning solution is regulated to 2-3; and 4) filtering and separating the electrowinning solution to obtain an iron-containing precipitate solution and a cobalt-containing precipitate solution, peeling off the copper growing on a cathode to obtain standard copper or crude copper so as to finally realize the selective separation of the copper, iron and cobalt. The process flow is simplified, the use problem of chemical reagents such as an oxidant in the deironing process is solved, and the device cost and the operation cost are reduced.

Description

technical field [0001] The invention belongs to the technical field of purification and separation of valuable metal solutions regenerated by hydrometallurgy of nonferrous metals, and in particular relates to a selective separation method for copper and iron in cobalt leaching solution in a sulfuric acid system. Background technique [0002] In the process of hydrometallurgical extraction and purification of cobalt metal, sulfuric acid solution is used as the medium for acid leaching at atmospheric pressure. The metallurgical operation environment is good, the corrosion to equipment is small, and the derivative products are easy to diversify. In the process of leaching cobalt material, it is necessary to add a reducing agent for leaching of high-valent cobalt. Generally, iron ions in the leaching solution are kept in a divalent state. At present, the methods for separating copper and iron in sulfuric acid medium are as follows: extraction of copper with copper extractant; fu...

AI Technical Summary

Problems solved by technology

The whole process is complicated, the energy consumption of steam is high, and the operation and production costs are increased. There is a large amount of acid mist and steam escaping in the workshop environment, and the production environment is not good.