Method for reducing calcium sulfate deposition in P204 extraction and impurity removal process

Abstract

The invention belongs to the technical field of hydrometallurgy, and discloses a method for reducing calcium sulfate deposition in a P204 extraction and impurity removal process. According to the method, extracted P204 loaded with an organic phase is washed; the washing process comprises primary washing and secondary washing; in the primary washing process and the secondary washing process, water and hydrochloric acid are both added into P204 loaded with the organic phase; in the primary washing process, the flow rate of water is V1 and the flow rate of hydrochloric acid is V2; in the secondary washing process, the flow rate of water is V1' and the flow rate of hydrochloric acid is V2'; the ratio of V1 to V2 is (8-12):1; and the ratio of V1' to V2' is (4-6):1. According to the method, sulfate radicals carried in the organic phase can be reduced, and then the problem that the sulfate radicals are combined with Ca<2+> in the washing process can be avoided; and calcium sulfate can be prevented from reaching the saturation concentration in the washing process, and then the precipitation of calcium sulfate can be reduced.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for reducing calcium sulfate deposition in the process of P204 extraction and impurity removal. Background technique [0002] With the rapid development of electric vehicles, the research and production of ternary battery materials have also been improved by leaps and bounds. The demand for high-purity nickel-cobalt metal has increased significantly. In order to meet the demand for ternary battery materials, the extraction and purification technology of cobalt and nickel has been vigorously developed. develop. [0003] The existing technological process for purifying and enriching cobalt and nickel from cobalt-nickel-rich sulfuric acid solution includes: firstly remove iron by goethite method, then use P204 extraction to remove impurities, back extraction and so on. During the P204 extraction and impurity removal process, the extracted P204 organic p...

AI Technical Summary

Problems solved by technology

In the washing stage of P204 extraction and impurity removal process, the backwashed Ca2+ combines with SO42- to precipitate as calcium sulfate The form of calcium sulfate deposits at the bottom of the extraction tank. As time goes by, the calcium sulfate crystals will accumulate more, thicker, and harder, resulting in the blockage of the stirring paddle, the weir of the extraction box, the nozzle, and the clarification chamber. A lot of manual cleaning and eradication will affect the extraction efficiency

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