Authors: Wei Liu Honglin Luo Wenqing Qing Yongxing Zheng Kang Yang Junwei Han
Publish Date: 2014/04/01
Volume: 45, Issue: 4, Pages: 1281-1290
Abstract
The direct oxidation of stibnite Sb2S3 using a gas mixture of nitrogenoxygen was investigated in a pilot plant Steadystate pilot operation of 5 and 10 t/d was normally observed during the pilot test of 100 days and a cleaning experiment of highantimony molten slag from oxygenenriched bottomblown was tested by direct reduction in a laboratoryscale electric furnace Autogenous smelting was achieved without adding any other fuel which guaranteed the feasibility and advantage of oxygenenriched bottomblown stibnite Through analysis and calculation the sulfur dioxide concentration in offgas was more than 8 pct which meets the requirement for the preparation of sulfuric acid In the reduction experiment the effects of added CaO the ratio of coal ω = actual weight of coal/theoretical weight of coal and the slag type on the reduction procedure were considered The residual slag obtained after reduction averaged less than 1 g/ton Au and less than 1 wt pct Sb The metal phase contained iron less than 3 wt pct and the recoveries of Au in the metal phase were more than 98 pct This process shows significant environmental and economic benefits compared with previous processesThe authors would like to acknowledge the National Natural Science Foundation of China No 51204210 the National High Technology Research and Development Program of China No 2011AA061001 and the National “Twelfth FiveYear” Plan for Science Technology No 2012BAC12B04 for financial support
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