How to deal with impurities in zinc refined ore after electrolysis

How to deal with impurities in zinc refined ore after electrolysis

The methods for treating impurities in zinc refined ore after electrolysis mainly include pyrometallurgical treatment, hydrometallurgical treatment, electrolysis, and chemical precipitation. ‌

Fire treatment: including rotary kiln volatilization or vortex melting treatment, through which the zinc content in the waste residue can be reduced to below 1.000%. The processed waste residue can be centrally stacked and classified for management. Especially when there is a high amount of lead in the waste residue, it can be used as a sintering ingredient for lead smelting, or treated by fuming method. This method has a high metal recovery rate and a high removal rate of harmful elements such as arsenic and antimony.

Wet treatment: Suitable for treating zinc containing waste electrolytes, magnesium sulfate is directly crystallized and separated from high sulfuric acid concentration wet zinc smelting waste electrolytes through freeze crystallization. This method can not only remove magnesium, but also recover heat and improve resource utilization efficiency.

Electrolysis method: Through the electrolysis process, oxides can be obtained, which can then be dissolved or reduced with sulfuric acid to obtain a solution. After evaporating and crystallizing in the solution, high-purity finished products can be obtained. But this method has a complex electrolysis process and consumes a lot of energy, so the product price is higher.

Chemical precipitation method: After deep purification of the solution, the purified solution is concentrated and crystallized to prepare high concentration zinc sulfate monohydrate. This method is currently a relatively mature purification method, but it requires a large amount of chemicals and strict control of reaction conditions. If other impurities are introduced, it will burden the purification process