锌焙砂氨法制取高纯锌(英文)

Preparation of High-Purity Zinc From Zinc Calcine by an Ammonia Process

利用NH3-NH4Cl水溶液浸出锌焙砂来制取高纯锌.Zn的平均浸出率约93%,浸出液中的杂质元素,如铜、镉、铅,用锌粉两段逆流能够完全置换除去.不同电流密度下的电流效率大于93.8%,槽电压约3.0V,每千克锌消耗电能2.550～2.650kW.电锌含锌量大于99.999%,杂质元素Cu,Cd,Co,Ni,Fe,As,Sb的含量均小于0.0001%,Pb的小于0.0003%.

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%.