Study on Energy Saving Measures of Oxygen Pressure Leaching Process
This paper introduces the process,technical characteristics and production practice of zinc hydrometallurgy.An energy-saving method of oxygen pressure leaching process was studied.In this method,the heat-carrying waste gas discharged from autoclave,flash tank and regulating tank was introduced into the washing tower,and the heat-carrying waste gas was washed with water to obtain hot water and purified gas.The waste electrolyte added with ferrous salt or Fe2+solution is heat exchanged with hot water in the heat exchanger,which can effectively recover the waste heat in the exhaust gas of the oxygen pressure leaching system.The steam consumption of the whole process(from zinc concentrate to electrozinc product)is reduced from 3.0 t steam/t-Zn to 1.5～2.0 t steam/t-Zn.By adding Fe2+to the waste electrolyte,the problem of fouling in the heat exchanger is solved,the cleaning frequency of the heat exchanger is effectively reduced,and the production efficiency is improved.This energy-saving measure has realized the low-carbon,high-efficiency and clean production of oxygen pressure leaching process,which has certain reference significance for production enterprises.
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