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1890年威特沃特斯兰德金矿就已采用锌置换沉淀法从氰化物溶液中回收金和银.随着添加铅盐,用锌粉代替锌丝,以及对溶液进行脱氧等不断改进,这个方法就成了处理低含金溶液的最有效方法之一.众所周知,置换沉淀作用对于溶液的碱度和游离氰化物浓度是很敏感的,而含金氰化液中许多常见的组分也都会影响置换沉淀反应的进行.
Gold and silver have been recovered from the cyanide solution using zinc displacement precipitation at the Wittelsrand Gold Mine in 1890. With the continuous addition of lead salts, the replacement of zinc wires with zinc powder, and the deoxygenation of the solution, This method has become one of the most efficient ways of dealing with low-gold-containing solutions.It is well-known that the substitutional precipitation is very sensitive to the alkalinity of the solution and to the concentration of free cyanide, and many of the common components of gold-containing cyanide Will affect the displacement of precipitation reaction.