硫代硫酸盐提金理论研究——金溶解动力学

A theoretical study on gold extraction by thiosulfate leaching:dissolution kinetics

采用腐蚀电化学方法研究了金在硫代硫酸盐溶液中溶解的动力学。无铜、氨时,金的溶解活化能为27.99kJ/mol,Cu(NH_3)_4^(2+)为0.01mol/L,总氨浓度为0.5mol/L时活化能降为15.54kJ/mol;在0.001～0.1mol/L范围内,Cu(NH_3)_4^(2+)的反应级数为1。动力学研究的结果进一步揭示了铜、氨在浸金过程中的催化作用,并再次证实了作者提出的氨性硫代硫酸盐溶液浸金的电化学—催化机理。

<keywords>A corrosion electrochemical method has been introduced to study the kinetics of gold dissolution in thiosulfate solution It is shown that activated energy of gold dissolution and Cu(NH_2)_4^(2+) are 27.99kJ/moland 0.01mol/L rospectively in the abvsence of tofal ammonia solution is 0.5mol/L In the range of the comcentration of 0.001-0.1mol/L .the reactuon reaction rate order of Cu(NH_2)_4^(2+) is 1. These results support once again the electrochemical cataeytical mechanism of gold leaching by amminiacal thiosufate solutuon proposed by the author and expose further the catalysis of copper ions and ammonia.