Electrochemical dissolution behavior of gold and its main coexistent sulfide minerals in acid thiocyanate solutions

• 作者: Guan Le Wen-Juan Li Kun Song Yong-Sheng Song Yong Chen An-Ping Bai Yu Cheng
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: RARE METALS(Monthly)
• 页码范围: 254-261
• 页数: 8页
• 语种: 英文

摘要

Electrochemical tests were developed to inves-tigate the electrochemical dissolution behavior of gold and its main coexistent sulfide minerals in acid thiocyanate solutions.The optimal leaching conditions for gold in acidic thiocyanate system were pH 2,0.15 mol·L-1 thio-cyanate and 0.2 g·L-1 Fe3+.Fe3+ addition to the acidic thiocyanate system promoted gold dissolution significantly,arsenopyrite dissolution was inhibited,chalcopyrite disso-lution was increased,and the dissolution behavior of other associated minerals remained mostly unchanged.Thio-cyanate made gold and associated mineral leaching easier.The galvanic corrosion effect of gold and its main coex-istent sulfide minerals in an acidic thiocyanate-free system was that the chalcocite,arsenopyrite and pyrite acted as a cathode to reduce anodic gold dissolution;galena as an anode undergoes oxidation to inhibit anodic gold dissolu-tion.There was almost no galvanic corrosion behavior between stibnite,yellow sphalerite and black sphalerite and gold.Thiocyanate addition changed the galvanic corrosion behavior of stibnite and yellow sphalerite in the thio-cyanate system,which inhibited anodic gold dissolution.In the acidic thiocyanate system in the presence of ferric iron,the arsenopyrite promoted anodic gold dissolution,the chalcocite and gold were mostly free of galvanic corrosion,and the remaining minerals inhibited anodic gold dissolution.