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Dissolution of gold in chalcopyrite-containing cyanide solutions
Journal of Central South University ( IF 4.4 ) Pub Date : 2020-06-10 , DOI: 10.1007/s11771-020-4385-z
Wei Yang , Kai Zhang , Ya-ping Wang , Tao Long , He Wan , Hui Li , Qian Wang

The gold dissolution in anoxic cyanide solution in the presence of chalcopyrite was studied with a rotating disc electrode. It was found that the presence of chalcopyrite reduced and enhanced the dissolution activity of pure gold in the low and high potential regions, respectively. The dissolution of gold was diffusion-controlled at low potentials (≤177 mV) and low cyanide concentrations (≤980 mg/L); however, above the cyanide concentration of 980 mg/L, the current density of gold decreased and the dissolution of gold changed from diffusion-control to electrochemical reaction-control. At high potentials (>177 mV), gold dissolution was always controlled by diffusion. In cyanide solution containing chalcopyrite, appropriate increase of pH value and temperature could accelerate the dissolution of gold, but high pH value would promote the generation of passivation, which was harmful for the dissolution of gold in cyanide solution.



中文翻译:

金在含黄铜矿的氰化物溶液中的溶解

用旋转圆盘电极研究了在黄铜矿存在下在缺氧氰化物溶液中的金溶解。发现黄铜矿的存在分别降低和增强了纯金在低和高电势区域的溶解活性。在低电势(≤177mV)和低氰化物浓度(≤980mg / L)下将扩散控制为金的溶解;但是,氰化物浓度超过980 mg / L时,金的电流密度降低,金的溶解度从扩散控制变为电化学反应控制。在高电位(> 177 mV)下,金的溶解始终由扩散控制。在含有黄铜矿的氰化物溶液中,适当提高pH值和温度可加速金的溶解,

更新日期:2020-06-10
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