Generation of reactive oxygen species from sulfide concentrates as a function of mineralogy
The generation of Reactive Oxygen Species ( ROS) , hydrogen peroxide and hydroxyl radicals, has been observed from sulfide mineral containing particles in acidic solutions. The implications of this phenomenon as a potential microbial stress-causing effect have been studied previously with respect to thermophilic bioleaching performance in the presence of finely milled pyrite and chalcopyrite concentrates. The results of this previous research was in good agreement with the reported sensitivity and decreased performance that thermophilic microorganisms exhibit towards fine sulfide solids and indicated that the generation and accumulation of toxic ROS in these systems could exacerbate this sensitivity. In this study, the effect of sulfide mineralogy on ROS generation in the absence of microbes was investigated. The mineralogical and elemental composition of 11 different sulfide mineral containing samples was obtained by quantitative X-ray diffraction ( Rietveld) analysis and, through the use of linear regression, various sulphide-related factors were identified as having a strong and significant correlation to ROS generation. These included iron and sulfide grade and more specifically the disulfide (S22- ) grade represented in pyrite and chalcopyrite sulfide phases. The findings of this study indicated that disulfide grade, present in pyrite and chalcopyrite phases, can be used as a direct measure of a sulfide concentrates potential to generate ROS under acidic bioleaching conditions.
Reactive Oxygen Species sulfide mineral bioleaching
Gavin C. Jones Robert P. van Hille Susan T. L. Harrison
Centre for Bioprocess Engineering Research, Department of Chemical Engineering,University of Cape Town, Private Bag, 7701, Rondebosch, South Africa
国际会议
The 19th International Biohydrometallurgy Symposium(第19届国际生物湿法冶金大会 IBS2011)
长沙
英文
59-65
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）