Low-gas-content electrolytic cobalt preparation method

Abstract

The invention belongs to the technical field of electrolytic refining, and particularly relates to a low-gas-content electrolytic cobalt preparation method. The method comprises the following steps that 1, a cobalt ammonia system is built, specifically, ammonia water of which the mass fraction is 10-15% is added into a cobalt chloride solution for complex reaction, and a cobalt ammonia solution isobtained; 2, solution circulation is conducted, specifically, the solution obtained in the step 1 is poured into a diaphragm electrolytic cell, and the flow speed in each cathode diaphragm zone is 3-4L/h; and 3, electrolysis is conducted, specifically, cobalt electrolytic deposition is carried out through a pulse power supply, the duty ratio is controlled to be 40:1, the gas element oxygen in anelectrolytic deposition cobalt pole plate is controlled to be lower than 10ppm, and carbon is controlled to be lower than 5ppm. According to the low-gas-content electrolytic cobalt preparation method,the unqualified problems that in the electrolytic deposition process, due to the fact that the cathode gas content is increased, the surface of the pole plate is loosened, pores are increased, and the electrolytic cobalt physical quality is reduced can be effectively solved, the electrolytic cobalt yield is greatly increased, in addition, technology operation is easy, and broadened scale production is facilitated.

Description

Technical field [0001] The invention belongs to the technical field of electrolytic refining, and specifically relates to a method for preparing electrolytic cobalt with low gas content. Background technique [0002] Electrolytic cobalt of high purity and high physical quality is used to prepare advanced electronic component targets. The impurities and gas content in the cobalt target will seriously affect the performance of electronic devices. Gas impurities (such as O) can increase the resistance of semiconductor components. Therefore, the preparation of electrolytic cobalt with low gas content is of great significance to improve the quality of cobalt targets. In China, Shanghai Institute of Nonferrous Metals, Jinchuan Cobalt and Nickel Design and Research Institute, Beijing General Research Institute of Nonferrous Metals, and Beijing General Institute of Mining and Metallurgy have used ion exchange and electrolytic refining to prepare high-purity electrolytic cobalt with a pur...

AI Technical Summary

Problems solved by technology

[0003] During the electrolysis of metal cobalt, in addition to the reduction reaction of cobalt on the cathode, under certain conditions, the precipitation reaction of hydrogen will also occur, that is, the phenomenon of "hydrogen embrittlement". , dissolution, etc., which increase the gas content on the cathode. On the one hand, pores are formed on the surface of the cathode, which reduces the current efficiency. On the other hand, the pores on the surface of the cathode cause the cathode plate surface to be loose, resulting in unqualified physical quality of electrolytic cobalt.