A preparation method and application of hydrometallurgy zinc purification and cobalt removal agent

Abstract

A kind of preparation method of hydrometallurgy zinc purifying cobalt removal agent, comprises the following steps: 1. prepare sodium formex aqueous solution, 2. place in reaction kettle, pass into cooling medium to reaction kettle jacket or internal cooling coil, keep kettle Temperature 10-25°C, slowly add caustic soda according to 0.5-1% of the quality of the sodium formazate aqueous solution, and stir evenly; 3. Use a pipette to pipette 2-4% carbon disulfide in the quality of the sodium formazate aqueous solution, and add it to the mixed solution obtained in step 2 Slowly add carbon disulfide to the mixture, keep the temperature in the kettle at 10-25°C, and stir. After adding carbon disulfide, continue to react for 30-60 minutes; 3. In the obtained solution, stir evenly to obtain the finished product purification cobalt removal agent. The invention has high purification and impurity removal efficiency, simple process, small consumption, fast reaction speed, and can obtain purification slag with higher cobalt valence state. It can remove nickel, copper, cadmium and other metal impurities at the same time, without affecting the zinc electrodeposition.

Description

technical field [0001] The invention belongs to the technical field of zinc solution purification in zinc hydrometallurgy process, and in particular relates to a preparation method and application of a hydrometallurgy zinc purification and cobalt removal agent. Background technique [0002] The main process of zinc hydrometallurgy is divided into five processes: roasting, leaching, cleaning liquid, electrowinning and melting and casting. In order to meet the requirements of zinc electrowinning, harmful impurities such as cobalt, copper, cadmium, nickel, arsenic, antimony, and germanium in the zinc sulfate leaching solution must be purified to below the specified standard, and copper, cadmium, cobalt, and Valuable metals such as nickel are well enriched for easy recycling. Therefore, purification is one of the most important processes in zinc hydrometallurgy. The purification methods used at home and abroad mainly include arsenic salt or antimony salt zinc powder replacemen...

AI Technical Summary

Problems solved by technology

[0003] Using antimony salt or arsenic salt zinc powder replacement method to remove cobalt is the most popular and conventional method at present: the purification ability is strong, although it is easy to produce highly toxic substance SbH in the replacement process 3 or AsH 3 , but as long as the purification tank is well-ventilated, it is also safe and reliable, but there are defects such as large zinc powder consumption, high temperature requirements in the purification process, large steam consumption, low cobalt content in the purification slag, and difficult recycling, resulting in high costs.

Images