Extraction of ferric iron from mineral surface and its function during bioleaching of chalcopyrite
Several methods were used to extract ferric iron from the mineral surface during bioleaching of chalcopyrite by moderate thermophiles. The results showed that ferric iron could be successfully extracted from the mineral surface by ultrasonic at 48℃ and the amount of ferric iron was very high ( about 42 mg per gram of ore residue). In addition, the SEM/EDX analysis also proved that the ferric iron was concentrated on the mineral surface during bioleaching. The chemical leaching of chalcopyrite by ferric irons was carried out and showed good performance of copper extraction. Copper extraction percentage could achieve to 54％ in only 7 days when the ferric irons was 10 g/L at pH 1. 0. Comparison of the components of ore residues after bioleached and chemical leached indicates that ferric iron could oxidize chalcopyrite to release sulphur, but the later oxidation of sulphur to sulphuric acid was mainly by bioleaching microorganisms.
ferric iron bioleaching chemical leaching chalcopyrite
Weimin Zeng Guanzhou Qiu Miao Chen
CSIRO Process Science and Engineering, Clayton, Victoria, 3169, Australia School of Minerals Process School of Minerals Processing and Bioengineering, Central South University, Changsha, China Key Labo CSIRO Process Science and Engineering, Clayton, Victoria, 3169, Australia
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
287-292
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）