|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||8th International Symposium on High Temperature Metallurgical Processing
||Intensification of Gold Leaching from a Multi-refractory Gold Concentrate by the Two-stage Roasting-alkaline Sulfide Washing-cyanidation Process
||Li Qian, Zhang Yan, Li Xishan, Xu Bin, Yang Yong-bin, Jiang Tao, Li Hong-wei
|On-Site Speaker (Planned)
The cyanide leaching rate of gold from a multi-refractory gold concentrate (18.05g/t Au) containing 1.62% As, 20.76% S, 6.95% C and 1.31% Sb was only 1.33%. The enhancement of gold leaching was studied mainly by the pretreatment of oxidation roasting and alkaline sulfide washing. Results showed that after the two-stage roasting (i.e., I stage of 500℃, 1h and II stage of 700℃, 2h) most of sulfur (93.84%) and carbon (98.27%) were removed, but the gold leaching rate of calcine just reached 71.33% because the residual arsenic (0.63%) and antimony (1.15%) in calcine were still high. After alkaline sulfide solutions of mixed NaOH and Na2S washing, the residual arsenic and antimony was further decreased to 0.21% and 0.65%, respectively. Finally, after the conventional cyanide leaching, the gold leaching rate increased to 93.52% substantially. Also, the optimized particle size, NaCN concentration and leaching time were -0.045mm over 85%, 0.1% and 36h, respectively.
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