摘要
提出了可以描述在各种金属离子浓度和不同的pH条件下,随铜盐添加量的增加,氰化物溶液中金属离子和CN-存在形态的公式.基于其计算结果,探讨了将铜盐加入含金银的氰化物溶液中时金银的沉淀机理,以及在矿石中铜含量较高时氰化物消耗量增加而金银浸出率降低的原因.将铜盐加入氰化物溶液中时,铜(Ⅰ)离子首先与溶液中游离CN-反应,然后从锌、镉、镍等金属的氰根配合物中"劫持"几乎全部的CN-,以CuCN形式生成沉淀,金银的氰根配合物被"劫持"CN-,以AuCN和AgCN型沉淀物沉淀.
A formula was proposed to describe the existence form of metal and CN- ions in cyanide solution with various copper additions, metal ion concentrations and pH values. Based on the calculation results, the precipitation mechanisms of gold and silver were investigated when copper is added into cyanide solution containing gold and silver, and the causation was also discussed for that the cyanide consumption increased and the leaching rates of gold and silver decreased in condition of high copper content in the ore. When added into cyanide solution, the copper first reacted with free ions of cyanide and then ＂robbed＂ almost all of the CN- from cyanide complexes of zinc, cadmium and nickel. CN- was precipitated simultaneously as CuCN. The gold and silver complexes were ＂robbed＂ of CN- and precipitated as AuCN and AgCN, resDectivelv.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第7期1004-1008,共5页
Journal of Northeastern University(Natural Science)
基金
国家"十一五"科技支撑计划项目(2008BAB34B01)
国家自然科学基金资助项目(51004033
50974035
51074047)
关键词
氰化物溶液
金
含铜金矿
存在形态
沉淀物
配合物
cyanide solution
gold
copper-bearing gold ore
existence form
precipitate
complex
