铅精炼时,由於用加锌法自其中脱除贵金属的结果,所以在金属中残留着0.5～0.7％的锌。目前自铅中除锌有两种分法:氧化法和鹼法。用这些方法自铅中脱锌时,除了铅的损失以外,还要有大量锌的损失,锌在这类情况下成为氧化物或锌酸鹽。此外,由於析出和蒸汽的缘故,这些方法对於操作人员的健康也是有害的。近来,已注意铅的蒸馏脱锌法,它的原理是利用锌和铅蒸气压的差别。锌的挥发性很 In the case of lead refining, 0.5 to 0.7% of zinc remains in the metal as a result of the noble metal removal from the steel by the zinc addition method. At present, there are two ways to remove zinc from lead: oxidation and alkali method. In these processes, dezincification from lead, in addition to the loss of lead, also involves a substantial loss of zinc, which in this case becomes an oxide or zincate. In addition, these methods are also detrimental to the health of operators due to precipitation and steaming. Recently, attention has been paid to the distillation of dezincification of lead, the principle of which is to make use of the difference in the vapor pressure of zinc and lead. Very volatile zinc