硫脲提金理论研究──金溶解动力学

A theoretical study on gold leaching by thiourea ──dissolution kinetics of gold

采用腐蚀电化学方法研究了金在酸性流脲溶液中溶解的动力学。无二氧化硫时金溶解的活化能为４２．１５ｋＪ／ｍｏｌ；二氧化硫浓度为１．０×１０－５ｍｏｌ／Ｌ时活化能为２９．９５ｋＪ／ｍｏｌ，在０．５×１０－６～１．０×１０－５ｍｏｌ／Ｌ范围内，二氧化硫的反应级数为１。动力学研究的结果进一步揭示了二氧化硫在侵金过程中的催化作用，并再次证实了作者提出的二氧化硫在酸性硫脲浸金过程中的电化学还原—催化作用机理。

A corrosion electrochemical method has been introduced to study the kinetics of gold dissolution in the thiourea solution. It has been shown that activated energy of gold dissolution is 42.15KJ/mol in the absence of So2,however it will reduce to 29.95KJ/mol when concentration of So2 is 1.0×10-5mol/L.In the range of the concentration of 1.0×10-6～1.0x 10-5mol/L,the reaction rate order of So2 is 1.These results support once again the electrochemical-catalytical mechanism of gold leaching by thiourea solution proposed by the author.