Method for treating cobalt carbonate mother liquor in preparation process of spherical cobalt carbonate

Abstract

The invention discloses a method for treating cobalt carbonate mother liquor in the preparation process of spherical cobalt carbonate. The method comprises the following steps that (1) ion exchange resin adsorption is carried out on the cobalt carbonate mother liquor filtered by white balls to obtain ion adsorption post-liquor and supported resin, the supported resin is desorbed by diluted hydrochloric acid to obtain hydrogen-type resin and acidic post-liquor, the hydrogen-type resin is transformed by ammonia water to obtain ammonium-type resin, the ammonium-type resin obtained after transformation continues to be used for treating the cobalt carbonate mother liquor, and the cobalt carbonate mother liquor is recycled; and (2) after evaporative crystallization is carried out on one part of the ion adsorption post-liquor in the step (1), ammonium chloride crystals and condensed water are obtained, the other part of the ion adsorption post-liquor is used for washing the ammonium-type resin, and only the ion adsorption post-liquor is adopted for washing the ammonium-type resin for the second time. By means of the method, the water treatment capacity can be reduced, the cobalt recovery rate can be improved, and the wastewater treatment difficulty can be reduced.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for treating cobalt carbonate mother liquor in the preparation process of spherical cobalt carbonate. Background technique [0002] At present, cobalt carbonate is mostly obtained by chemical precipitation with cobalt chloride solution as raw material and ammonium bicarbonate as precipitant. After the reaction, a small amount of cobalt in the mother liquor produced after solid-liquid separation of cobalt carbonate slurry needs to be recovered. The current The process 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. The other is to extract and recover the cobalt in the mother liquor. The direct evaporation method has the following disadvantages: cobalt is not effectively recovered, and enters the by-product ammonium chloride in t...

AI Technical Summary

Problems solved by technology

The direct evaporation method has the following disadvantages: cobalt is not effectively recovered, and enters the by-product ammonium chloride in the form of impurities to directly open the circuit, 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

Although the extraction method can recover some valuable metals, the recovery rate is average, and there is a certain degree of mutual solubility between the organic phase and the water phase, which will cause organic matter to enter the water system and affect equipment and products.

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