A hydrometallurgical process for refractory gold-bearing arsenosulfide concentrates at ambient temperature and pressure was presented, including fine grinding with intensified alkali-leaching (FGIAL), enhanced agitation alkali-leaching (EAAL), thiosulfate leaching and displacement. Experimental results on a refractory gold concentrate showed that the total consumption of NaOH in alkaline leaching is only 41% of those theoretically calculated under the conditions of full oxidization for the same amount of arsenides and sulfides transformed into arsenates and sulfates, and 72.3% of gold is synchro-dissoluted by thiosulfate self-generated during alkaline leaching. After alkaline leaching, thiosulfate leaching was carried out for 24 h. The dissolution of gold is increased to 91.9% from 4.6% by cyanide without the pretreatment. The displacement of gold by zinc powder in the solution gets to 99.2%. Due to an amount of thiosulfate self-generated during alkaline leaching, the reagent addition in thiosulfate leaching afterwards is lower than the normal.
部门归属
chinese acad sci, inst met res, shenyang 110016, peoples r china.;meng, yq (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china;yqmeng@imr.ac.cn
Y. Q. Meng. Pretreatment and thiosulfate leaching of refractory gold-bearing arsenosulfide concentrates[J]. Journal of University of Science and Technology Beijing,2005,12(5):385-389.
APA
Y. Q. Meng.(2005).Pretreatment and thiosulfate leaching of refractory gold-bearing arsenosulfide concentrates.Journal of University of Science and Technology Beijing,12(5),385-389.
MLA
Y. Q. Meng."Pretreatment and thiosulfate leaching of refractory gold-bearing arsenosulfide concentrates".Journal of University of Science and Technology Beijing 12.5(2005):385-389.
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