Abstract: In this article a new process of using ammonia and ammonium chloride solution to leach zinc calcine and electrowinning high-purity zinc has been developed successfully.The average leaching ratio of zinc was about 93%.The impurities,such as Cu,Cd and Pb,in the filtrate were cemented out completely by using zinc powder with two-stage countercurrent.At different current density,the current efficiency was higher than 93.8%.During electrowinning cell voltage was about 3.0 V and power consumption ranged from 2.550 to 2.650 kW per kilogram zinc.The zinc content in the electrowinned zinc was more than 99.999%,and the contents of the impurities of Cu,Cd,Co,Ni,Fe,As and Sb were lower than 0.000 1% respectively,and Pb was lower than 0.000 3%.

Key words: high-purity zinc, ammonia, ammonium chloride, zinc calcine