Abstract Electrochemical tests were developed to investigate 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 thiocyanate and 0.2 g·L −1 Fe 3+ . Fe 3+ addition to the acidic thiocyanate system promoted gold dissolution significantly, arsenopyrite dissolution was inhibited, chalcopyrite dissolution was increased, and the dissolution behavior of other associated minerals remained mostly unchanged. Thiocyanate made gold and associated mineral leaching easier. The galvanic corrosion effect of gold and its main coexistent 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 dissolution. 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 thiocyanate 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.

中文翻译：

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金及其主要共存硫化物矿物在酸性硫氰酸盐溶液中的电化学溶解行为

摘要 进行电化学测试以研究金及其主要共存硫化物矿物在酸性硫氰酸盐溶液中的电化学溶解行为。酸性硫氰酸盐体系中金的最佳浸出条件为pH 2、0.15 mol·L -1 硫氰酸盐和0.2 g·L -1 Fe 3+ 。Fe 3+ 添加到酸性硫氰酸盐体系中显着促进了金的溶解，毒砂溶解受到抑制，黄铜矿溶解增加，其他伴生矿物的溶解行为基本保持不变。硫氰酸盐使金和相关矿物的浸出更容易。金及其主要共存硫化物矿物在酸性无硫氰酸盐体系中的电偶腐蚀作用是辉铜矿、毒砂和黄铁矿作为阴极，减少阳极溶解金；方铅矿作为阳极经历氧化以抑制阳极金溶解。辉锑矿、黄色闪锌矿和黑色闪锌矿与金之间几乎没有电偶腐蚀行为。添加硫氰酸盐改变了硫氰酸盐体系中辉锑矿和黄色闪锌矿的电偶腐蚀行为，抑制了阳极金溶解。在三价铁存在的酸性硫氰酸盐体系中，毒砂促进了阳极金溶解，辉铜矿和金大部分没有电偶腐蚀，其余矿物抑制了阳极金溶解。添加硫氰酸盐改变了硫氰酸盐体系中辉锑矿和黄色闪锌矿的电偶腐蚀行为，抑制了阳极金溶解。在三价铁存在的酸性硫氰酸盐体系中，毒砂促进了阳极金溶解，辉铜矿和金大部分没有电偶腐蚀，其余矿物抑制了阳极金溶解。添加硫氰酸盐改变了硫氰酸盐体系中辉锑矿和黄色闪锌矿的电偶腐蚀行为，抑制了阳极金溶解。在三价铁存在的酸性硫氰酸盐体系中，毒砂促进了阳极金溶解，辉铜矿和金大多没有电偶腐蚀，其余矿物抑制了阳极金溶解。