Chalcopyrite bioleaching by mesophilic microorganisms and surface passivation
Through breeding and domestication of excellent leaching bacteria, chalcopyrite bioleaching by mesophilic microorganisms was studied. The passivation phenomenon of chalcopyrite surface, the types of the passivation film formed, the chalcopyrite reactions and causes of passivation were also analyzed. The results of the study on chalcopyrite bioleaching by A. ferrooxidans, A. thiooxidans and mixed bacteria show that there was an obvious flocculent parcel layer made up of bacteria and jarosite when chalcopyrite was bioleached by A. ferrooxidans. During the bioleaching processes by A. thiooxidans and mixed bacteria, the passivation phenomena were more significant in the later stages of the process and the chalcopyrite surface had a higher content of sulfur. The thin layer of sulfur had a strong impediment on mineral dissolution. When pretreated by sulfate solution, the leaching effect of mixed bacteria was significantly inhibited. While pretreatment with ferrous sulfate solution caused, the leaching effect of mixed bacteria to be enhanced to some extent.
mesophilic microorganisms chalcopyrite bioleaching passivation
Guanghua Ai Yanqiong Tu Xiuxiang Tao
School of Resources and Environmental Engineering, Jiangxi University of Science and Technology,No.8 School of Resources and Environmental Engineering, Jiangxi University of Science and Technology,No.8 School of Chemical Engineering and Technology, China University of Mining and TechnologyUniversity R
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
632-637
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）