Method for treating cobalt intermediate product

Abstract

The invention discloses a method for treating a cobalt intermediate product. The method for treating the cobalt intermediate product comprises the steps that S1, acid dissolution leaching is carried out, specifically, water is added to the cobalt intermediate product to prepare pulp, and sulfuric acid is added to the pulp during stirring for leaching, the cobalt intermediate product contains the following components: 26.90% of cobalt, 1.58% of copper, 3.99% of manganese, 1.62% of calcium, 4.09% of manganese and 5.09% of iron; S2, reduction leaching is carried out, specifically, hydrogen peroxide is added as a reducing agent for further leaching, and then filtering is carried out to obtain leaching liquid and leaching residue; and S3, iron removal is carried out, specifically, carbonate isadded to the leaching liquid to adjust the pulp, and then solid-liquid separation is carried out to obtain iron removal slag and iron removal liquid. The method for treating the cobalt intermediate product is simple in process and is realized through three steps of acid dissolution leaching, reduction leaching and iron removal. The hydrogen peroxide is adopted to reduce Co3+ which is difficult toleach in the leaching process, and the leaching of cobalt and the removal of iron can be quickly and effectively achieved without any environmental pollution, and the method for treating the cobalt intermediate product belongs to clean production. Compared with other commonly used reducing agents, the reagent cost of the hydrogen peroxide is lower in price, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for processing cobalt intermediates. Background technique [0002] my country's cobalt ore resources are scarce and have always relied on imports. In recent years, with the continuous expansion of domestic cobalt smelting capacity and changes in the international supply of cobalt raw materials, domestic smelters have begun to import and purchase more intermediate cobalt products out of various considerations. Cobalt intermediates are mainly cobalt hydroxide, and sulfuric acid leaching is generally used for the treatment of cobalt intermediates, while cobalt intermediates contain a small amount of Co 3+ ,Co 3+ Not easily leached by acid, usually needs to be reduced to Co 2+ Then leaching is carried out. [0003] At present, the commonly used reducing agents in the leaching process of cobalt intermediate products include ferrous sulfate, sulfur dioxide, sodium ...

AI Technical Summary

Problems solved by technology

The amount of chemical reagents consumed in leaching is large and the cost is high. At the same time, these reducing agents will also introduce impurity elements. The use of ferrous sulfate will increase the weight of waste residue, and sulfur dioxide, sodium sulfite, and sodium pyrosulfite, such sulfides are easy to cause pollution.