Catalytic Oxidation of Refractory Gold Concentrate with High Sulphur and Arsenic by Nitric Acid
To extract the gold from refractory gold concentrate with high sulfur and arsenic, the gold concentrate was catalytically oxidized to expose the gold for cyanide leaching. The effects of reaction temperature, initial nitric acid concentration, reaction time and initial gold concentrate concentration on the conversion rate were studied. The results show that the appropriate conditions for the catalytical oxidation of this gold concentrate are: reaction temperature of 65℃; initial nitric acid concentration of 25% (wt.); reaction time of 1.5 hours; initial gold concentrate concentration of 10% (wt.). Under such conditions, the conversion rate of gold concentrate is 92%. The solution can be used to prepare nano-iron oxide red pigment. Gases released in the process can be recycled and reused by oxidation absorption. A chemical background of catalytic oxidation is proposed.
Catalytic oxidation Refractory gold concentrate Nitric acid Effect
G. L. Gao D. G. Li Y. Zhou S. H. Xu
Addressed College of Environmental Science and Engineering,Donghua University, Shanghai, China
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
1819-1822
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）