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New Progress in Investigation on Bioleaching of Low-grade Nickel-Cobalt Oxidized Ore

DONG Fa-qin;XU Long-hua;Dai Qun-wei;Chen Shu;Liu Ming-xue;Key Laboratory of Solid Waste Treatment and Resource,Recycle Ministry of Education,Southwest University of Science and Technology;  
Bioleaching technology is an effective measure to deal with low-grade ore.However,Reserch in China mainly focuses on howt autotrophic microorganisms leach sulphide ore,while little research is carried out on leaching of oxidized ores by heterotrophic microorganisms.Heterotrophic microorganisms have the potential in producing metabolites that are able to extract or dissolve nickel-and cobalt-contained low-grade nickel-cobalt oxidized ore via acidolysis,reduction,basification and complexation,which help to resolve the problems of nickel and cobalt resources shortage and offer technique supports to heavy metal pollution treatment.In the case of low-grade nickel-cobalt oxidized ore,weathered crust and secondary resources(metallurgical slag,waste batteries,spent catalysts,etc.),this paper introduces the status of world's nickel and cobalt resources and types of low-grade nickel-cobalt oxide ore.Meanwhile,the current status of research on heterotrophic microorganisms leaching lowgrade nickel-cobalt oxidized ore is reviewed.The leaching conditions and difficulties of heterotrophic microorganisms leaching are pointed out.Finally,the development direction of future research on bioleaching of nickel-cobalt oxidized ore is proposed.
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