Microbial reduction of chromite overburden for recovery of Nickel and Cobalt:An alternative of thermal reduction
The chromite overburden is a mining waste material generated during excavation of chromite ore at Sukinda mines of Orissa Mining Corporation ( OMC) , India. This is lateritic ore contains many valuable metals like Ni 0. 8％ , Co 0. 05％ , Cr 1. 9％ and Mn 0. 3％ along with 50％ Fe mainly present in form of goethite. Thermal treatment of ore was able to enhance the recovery of nickel and cobalt during subsequent bio or acid leaching. Microbial dissimilatory Fe (III) reduction plays an important role in the geochemical cycling of iron and organic matter in anoxic ecology system. Metal cations that are co-precipitated or structurally incorporated in FeOOH may be released during bacterial reduction of Fe (III) oxide. As thermal treatment is cost intensive process, a bacterial reduction process using dissimilatory Fe (III) reducing bacterial consortium under anaerobic condition was used to investigated its potential for reduction of iron present in ore and subsequent benefit in Ni and Co leaching. Original and reduced ore were examined for phase changes by XRD. Original ore did not contain any magnetic fraction. Leaching of metal values from ore was enhanced by microbial reduction of ore, though less compared to thermal reduction but significantly higher than the original ore.
chromite overburden lateritic ore Bacterial reduction Dissimilatory Fe (III) reducing bacteria
N. Pradhan R. R. Nayak E. Priyadarshini L B. Sukla B. K. Mishra
Institute of Minerals and Materials Technology (CSIR), 751013, Bhubaneswar, India
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
1090-1095
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）