Method for selectively precipitating and separating cobalt in potential-control manner

Abstract

The invention provides a method for selectively precipitating and separating cobalt in a potential-control manner. Copper-cobalt-manganese slag is used for neutralizing a copper-cobalt-manganese solution to a required pH value; then, sodium sulphide is added under the condition of simultaneously controlling the solution potential and the pH value to perform vulcanization copper removal; after the copper removal, sodium ethylxanthate is added under the condition of simultaneously controlling the solution potential and the pH value to perform precipitation cobalt removal; after the cobalt removal, sodium sulphide is added into the solution under the condition of simultaneously controlling the solution potential and the pH value to perform vulcanization zinc removal; after the zinc removal, sodium carbonate is added in the solution for neutralizing and producing manganese carbonate. The method practically realizes the stepped precipitation and separation of the copper, the cobalt and the zinc in the solution through simultaneously controlling the metal ion mixed potential and the pH value in the solution; particularly, the cobalt content in the cobalt precipitate products reaches more than 20.0 percent; the processes are closely associated; the single process cannot reach the expected effect of the stepped separation of valuable metal.

Description

technical field

[0001] The invention relates to a hydrometallurgical process in the field of nonferrous metallurgy, in particular to a hydrometallurgical method using potential-controlled selective precipitation to separate cobalt. Background technique

[0002] Cobalt is a steel-gray metal with metallic luster. Its excellent physical properties determine its wide application in cemented carbide, heat-resistant alloy, lithium-ion battery cathode material and pigment industry. However, my country's cobalt resources are very scarce, and it has long relied on importing cobalt ore from countries such as Congo (Kinshasa) and Zambia, which are rich in cobalt resources. implementation, cobalt ore needs to be smelted into copper-cobalt alloy by electric furnace for export, so copper-cobalt alloy replaces cobalt ore and becomes an important cobalt raw material in the Chinese market. Here comes the difficulty.

[0003] The classic process of extracting cobalt from cobalt ore is: cobalt...

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