Preliminary study on the bioleaching behavior of a high acid-consuming pentlandite/pyrrhotite ore 1: Biotic vs abiotic leaching
The bioleaching of an acid-consuming mineral sulphide ore was studied to characterize the oxidation process using a culture of Acidithiobocillus ferrooxidans, strain LR during 1 month. The main mineral phases found by XRD were pentlandite and pyrrhotite. The experimental results showed an increase of the pH in solution and low redox potential during all the time. After 1 month of bioleaching 18％ Ni and 4％ Cu extraction were found in the biotic flasks and 20％ Ni and 8％ Cu in the abiotic control. The precipitation of ferric compounds was observed in all flasks but the concentration of iron and sulfate was higher in the flasks containing bacterial cells. In spite of the fact that apparently the biological process did not have positive effect on the metals extractions, the presence of bacteria increased the iron solubilization from the ore and the sulfur oxidation. That result could indicate that the increased generation of precipitates might have affected the solubilization of Ni and Cu.
pentlandite pyrrhotite biooxidation nickel A. ferrooxidans
Alexandra Munoz Denise Bevilaqua Oswaldo Garcia Wolfgang Sand
Institute of Chemistry, Sao Paulo State University,Rua Francisco Degni, Araraquara, Brazil Biofilm Centre, Duisburg-Essen University,Universitatsstrase 5, 45141, Essen, Germany
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
656-659
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）