Processing method of cobalt carbonate mother liquor in cobalt powder precursor cobalt carbonate preparation process

Abstract

The invention discloses a processing method of a cobalt carbonate mother liquor in cobalt powder precursor cobalt carbonate preparation process. The method comprises the steps that countercurrent extraction is conducted on a saponified organic phase and the cobalt carbonate mother liquor to obtain a loaded organic phase and raffinate, stripping is conducted on the loaded organic phase by using hydrochloric acid to obtain a blank organic phase and a cobalt chloride solution, the blank organic phase is saponified by the using the cobalt carbonate mother liquor to obtain a saponified organic phase, the saponified organic phase is returned to a countercurrent extraction procedure to be recycled; (2), evaporating crystallization is conducted on at least part of the raffinate obtained in step (1) to obtain ammonium chloride and condensed water. According to the method, an existing treatment method in which ammonia water is directly replenished is no longer adopted by the blank organic phaseafter hydrochloric acid stripping is conducted, saponification is conducted by adopting the cobalt carbonate mother liquor to be used continuously, the using amount of the ammonia water is reduced, the evaporation amount of the evaporating crystallization procedure is reduced, the consumption of raw and auxiliary materials is reduced, the energy consumption is reduced, and the cobalt chloride solution enters a cobalt carbonate synthesis procedure.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for treating cobalt carbonate mother liquor produced during the preparation of cobalt powder precursor cobalt carbonate. Background technique [0002] At present, metal cobalt powder is mostly produced by hydrogen reduction of cobalt carbonate or hydrogen reduction of cobalt oxide (generated by calcination of cobalt carbonate). Cobalt carbonate is mostly obtained by chemical precipitation using ammonium bicarbonate as a precipitant and cobalt chloride solution as a raw material. A small amount of cobalt in the mother liquor produced after the solid-liquid separation of the cobalt carbonate slurry after the reaction needs to be recovered. The current technology is to directly evaporate the mother liquor containing a small amount of cobalt with an evaporation crystallization device such as MVR, and the cobalt directly enters the by-product ammonium chloride. This kind of technolo...

AI Technical Summary

Problems solved by technology

This kind of technology has the following disadvantages: cobalt is not effectively recovered, and directly opens the way in the by-product ammonium chloride in the form of impurities, which not only causes the reduction of cobalt recovery rate, but also increases the impurity content of the by-product ammonium chloride, reducing the quality of the by-product

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