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用电解精炼法进行粗铅的进一步精炼,在工业上早已得到应用。我国和日本的工厂及其它国家的某些工厂就是采用火法初步精炼然后电解精炼的方法。根据铅的电化学性质,铅在0.2克分子/升硝酸铅溶液中测得的交换电流为4×10~(-2)安/米~2,这说明铅在阴极析出只须很小的极化值。铅的零电荷电位为-0.69V(在0.001克当量的氯化钾溶液中测出),而其标准电极电位为
The use of electrolytic refining of crude lead for further refining has long been used in industry. Some factories in our country and Japan and some in other countries are those that are preliminarily refined and then electrolytically refined by the fire method. According to the electrochemical properties of lead, the exchange current of lead measured in 0.2 mol / l of lead nitrate solution is 4 × 10 -2 Am / m 2, indicating that the lead is precipitated at the cathode only a very small Value. The zero-charge potential of lead is -0.69V (measured in 0.001 gram equivalent of potassium chloride solution) and its standard electrode potential is