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世界范围内,大多数金和银都用氰化流程提取。这2种贵金属的回收涉及2种截然不同的流程：用碱性氰化物溶液氧化溶解金和银及从溶液中还原沉淀金属。从氰化角度考虑,金和银矿石可分为易选矿石和难处理矿石。难处理矿石的含义为：当用常规氰化法处理时,金属回收率很低(＜80％),或试剂消耗量很大。这些难处理矿石通常采用一些氧化工艺预处理,之后,金和银可以用常规的氰化工艺回
Worldwide, most gold and silver are extracted using cyanidation processes. Recycling of these two noble metals involves two distinct processes: the oxidation of gold and silver with alkaline cyanide solution and the reduction of the precipitated metal from the solution. From the cyanide point of view, gold and silver ore can be divided into easily-selected ore and refractory ore. Refractory ore means that the metal recovery is low (<80%) or the reagent consumption is high when treated by conventional cyanidation. These refractory ores are usually pretreated with some oxidation process, after which gold and silver can be recovered using conventional cyanidation processes