Deep purification and impurity removal process for cobalt chloride solution

Abstract

The invention provides a deep purification and impurity removal process for a cobalt chloride solution. The deep purification and impurity removal process is characterized in that the deep purification and impurity removal process comprises a P507 strip liquor storage tank, an oil remover, a resin tower, a washing liquid precipitation tank, a P507 strip liquor delivery pump, an oil-removed liquor delivery pump, a washing liquid low-position tank and a washing liquid delivery pump. According to the deep purification and impurity removal process, D201-III resin is adopted to conduct deep impurity removal on P507 reverse extraction cobalt chloride, the technological process is simple, automatic operation can be achieved, the impurity removal depth is high, the impurity content of the liquid before crystallization is smaller than 0.2 mg / L, impurities include Cd, Cu and the like, the cobalt-impurity ratio of the liquid after impurity removal is 600000-750000: 1, and the impurity content of cobalt chloride produced through crystallization is lower than 2 ppm; and meanwhile, a resin adsorption deep purification link is added, which is equivalent to an additional insurance, so that the error-tolerant rate of the process operation is increased, and the influence of impurity content fluctuation of the front-end cobalt chloride solution on the product quality is reduced.

Description

technical field [0001] The invention relates to the technical field of purification technology in the cobalt hydrometallurgy industry, in particular to a deep purification and impurity removal process for cobalt chloride solution. Background technique [0002] Raw materials containing copper and cobalt are leached into the solution with valuable metals such as Cu and Co in the sulfuric acid system. The solution is initially purified by the front-end process to remove impurities such as Fe, Cu and Al to obtain a cobalt sulfate solution. The cobalt sulfate solution is removed through the cobalt extraction process. Mn, Ca, Zn and other impurities to obtain cobalt chloride solution. Cobalt chloride solution generally produces cobalt chloride products by evaporation and crystallization; [0003] The problems existing in the production of cobalt chloride products by adopting the above process flow: 1. In the process of extracting and removing impurities, cadmium is not completely...

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Problems solved by technology

[0003] The problems existing in the production of cobalt chloride products by adopting the above process flow: 1. In the process of extracting and removing impurities, cadmium is not completely separated from cobalt due to the extraction rate, resulting in the enrichment of copper and cadmium in the cobalt chloride solution after P507 stripping; 2. Single Relying on extraction and removal of impurities is greatly affected by the impurity content of the raw material itself, which is not conducive to the long-term stable control of the extraction process; 3. Other external factors, such as the impurity index required by the customer and the level of personnel operation, etc., will affect the existing extraction and removal process. The impact is large, and the impurity content cannot be adjusted quickly

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