申请人:American Chemical & Refining Co., Inc.
公开号:US04092154A1
公开(公告)日:1978-05-30
A precipitating agent for precipitating precious metals such as gold from aqueous cyanide solution of the precious metal ions includes aluminum powder and a reducing agent such as sodium hydrosulfite, sodium borohydride or hydrazine. The precipitating agent may also include an alkali metal carbonate, such as potassium carbonate, as an activator. The precipitating agent efficiently reduces the precious metal ions to elemental metal for recovery and also consumes a portion of the cyanide content, which is often high in such solutions. The method of use includes adjusting the precious metals cyanide solution to a high pH, adding the precipitating agent with agitation, preferably in incremental portions of the amount required. The solution is allowed to stand to permit the precipitated metal to settle, and the metal is separated from the solution.
用于从贵金属离子的水溶性氰化物溶液中沉淀黄金等贵金属的沉淀剂包括铝粉和还原剂,如氢亚硫酸钠、硼氢化钠或肼。沉淀剂还可以包括碱金属碳酸盐,例如碳酸钾,作为活化剂。沉淀剂有效地将贵金属离子还原为元素金属以进行回收,并消耗其中一部分氰化物含量,这在这种溶液中通常很高。使用方法包括将贵金属氰化物溶液调节到高pH值,在搅拌的情况下加入沉淀剂,最好按所需量的增量加入。让溶液静置以使沉淀的金属沉淀,并从溶液中分离金属。