Bioleaching of pyrite gravity concentrate from a coal mine to produce iron oxide pigments
During the coal prospecting operation nearly 60％ of the mined coal is considered as tailings. The reason for such high amount of that residue is an attempt to produce low sulphur content coal for energy generation purpose. Therefore, this technical contribution aimed at gravity concentrating, in the first place, the iron sulphide minerals, pyrite in particular, for bio-assisted digesting them to produce ferric sulphate bearing leachates, considering two different particle size ranges (12％ as + 3 mm -6 mm, and 88％ as + 6 mm -9 mm). Those leachates were used as raw material for producing iron oxide pigments, goethite, for instance, intensively used in different industrial sectors such as ceramic, paint etc. The bioleaching test were accomplished using different consortium of microorganisms in a four metre pilot scale column in a sort of ramping up mode so as to reach, separately, the potentiality of those particular groups of microorganisms. According to the results out of the in progress bioleaching test of the aforementioned concentrate, the iron extraction is about 45％ , which is the result of 220 days of test, and prone to be enhanced as the operation parameters are being optimised.
bioleaching iron oxide pigment gravity concentrate autotrophic microorganisms mineral coal
Carlos E. G. de Souza Debora M. de Oliveira Luis G. S. Sobral
Centre for Mineral Technology, Av. Pedro Calmon, no 900, Rio de Janeiro, Brazil
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
736-741
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）