Research and Practice for Improving Gold and Copper Leaching Rate from Sulfation-roasted Calcine
LI Ming-liang1, WANG Xian-zhong1, ZHANG Shao-hui1, ZHAO Ya-feng2, JIA Jia-lin3, LYU Chao-fei1, DONG Wen-long1, JI Guo-qiang1
1.Tongguan Zhongjin Smelting Co Ltd, Tongguan 714399, Shaanxi, China;
2.China National Gold Group Co Ltd, Beijing 100011, China;
3.Northwest Institute of Non-ferrous Metal Research, Xi′an 710016, Shaanxi, China
Abstract：In order to improve Au and Cu leaching rate from the sulfation-roasted calcine, reduce the Au grade in tailings and lessen the influence of Cu on cyanidation leaching, effects of the grain size of calcine, the concentration of H2SO4 and temperature on the removal rate of Cu with sulfuric acid, as well as Au leaching rate from the obtained residue by cyanidation were investigated. Results showed that the calcine (at the fineness of -0.045 mm 90.16%) was subjected to a 2-h leaching process at a temperature of 80 ℃ with acidity of 25 g/L, liquid to solid ratio at 1.5∶1, resulting in the Cu removal rate by sulfuric acid at 93.62%. The obtained residue went through a 60-h leaching with NH4HCO3 dosage at 10 kg/t, liquid to solid ratio at 1.5∶1, NaCN concentration of 0.10%, the gold leaching rate was as high as 98.04%. Based on the research results, the existing production process was optimized by raising the temperature for Cu removal and increasing H2SO4 concentration, as well as adding more cyclones and leaching tanks in the cyanidation leaching process, also adopting process of two-stage leaching plus two-stage washing, which resulted in both Cu and Au recovery rates remarkably improved and brought in better economic benefits.
李明亮, 王宪忠, 张绍辉, 赵亚峰, 贾佳林, 吕超飞, 董文龙, 纪国强. 提高硫酸化焙砂中金和铜浸出率的研究与实践[J]. 矿冶工程, 2018, 38(4): 106-110.
LI Ming-liang, WANG Xian-zhong, ZHANG Shao-hui, ZHAO Ya-feng, JIA Jia-lin, LYU Chao-fei, DONG Wen-long, JI Guo-qiang. Research and Practice for Improving Gold and Copper Leaching Rate from Sulfation-roasted Calcine. Mining and Metallurgical Engineering, 2018, 38(4): 106-110.
2018, Vol. 38 
