中国有色冶金

In order to reduce the unit consumption of zinc powder in the purification process and improve the quality of electrowinning feed, Yunxi Wenshan Zinc Indium Smelting Co. Ltd. conducted a test on Co removal from the primary purified solution by using antimony trioxide method, and analyzed the test results. In the test, better process parameters obtained are: agitation speed of 400r/min, temperature of 85~90℃, Sb-Co ratio of 0.2~0.25, zinc powder of 2.5~3.0g/L, pH value of 4.5 and reaction lasting 2~2.5h. Under such conditions, the Co content in the solution can be reduced to below 0.4mg/L and the quality of electrowinning feed is improved, creating a good condition for the downstream process. Meanwhile, the good process control in the secondary purification has guaranteed a lower unit consumption of zinc powder and played a positive guiding role in stabilizing production, reducing cost and increasing efficiency.