Pre-Oxidation of High-Sulfur and High-Arsenic Refractory Gold Concentrate by Ozone and Fe (III) in Acidic Media
Owing to the significant quantities of precious metals that are embodied in high-sulfur and high-arsenic refractory gold concentrate (HGC), these are potential viable sources of precious metals. In addition, they potentially endanger the environment, as the sulfur and arsenic they contain may be released into the environment in hazardous form. Hence, treating HGC in an efficient, friendly technique can bring economic and environmental benefits. In this paper, by employing ozone and ferric sulfate in acidic media, the feasibility of recovery of precious metals from HGC is shown. A L9 (43) orthogonal experiment was used to study the effects of four factors, namely, reaction temperature, ferric sulfate concentration, reaction time, and Liquid/Solid mass ratio on Fe extraction rate from the HGC. The orthogonal experiments results showed that the most significant factor for Fe extraction rate was reaction temperature. Furthermore, the results of single factorial experiments showed that the Fe extraction rate increased with ozone amount, liquid to solid ratio and temperature, but was independent of stirring speed when stirring speed is above 860 rpm. The selected oxidized residues from orthogonal experiment were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD) and Scanning electron microscopy (SEM). These measurements suggested the pre-oxidation process made the sulfide matrices contained in HGC break down.
pre-oxidation ozone and ferric sulfate Orthogonal experiment high-sulfur and high-arsenic refractory gold concentrate
Li Qingcui Li Dengxin Qian Fangjun
College of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Songjiang District, Shanghai 201620, China
国际会议
The 3rd International Conference on Waste Management and Technology(第三届固体废物管理与技术国际研讨会)
北京
英文
64-78
2008-11-05（万方平台首次上网日期，不代表论文的发表时间）