Selective bioleaching of zinc

Details Selective bioleaching of zinc Selective bioleaching of zinc

1997-12-11

2000-08-15

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iib metal

C01G 900, C22B 1900

Patent

active

061032042

ABSTRACT:
A method of selectively leaching zinc from a source material containing zinc in sulphide form and iron, comprises the steps of subjecting the source material to bioleaching with a strict sulphur oxidizing micro organism or a mixed culture of sulphur oxidizing and iron oxidizing micro organisms, in the presence of a nutrient solution containing less than about 15 mg/L phosphate ions. In another embodiment, the source material is in the form of a slurry having a solids concentration of at least about 25% on a weight per volume basis and a nutrient solution containing from about 1 mg/L to less than about 100 mg/L ammonium ions, from about 0.5 mg/L to less than about 40 mg/L magnesium ions and from about 2 mg/L to less than about 60 mg/L phosphate ions.

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1. Paper entitled Bio-Oxidation of a Complex Zinc Sulphide Ore: a Study Performed in Continuous Bench and Pilot Scale. By Sandstrom, A.S., Sundkvist, J.E., Petersson, S. 1997, no month Paper No. M1.1 IBS Biomine '97 Conference Proceedings, Australian Mineral Foundation, Glenside, SA, Australia.
2. Paper entitled Bacterial Leaching of a Sulphide Ore by Thiobacillus Ferrooxidans and Thiobacillus Thiooxidans: 1. Shake flask experiments. By Lizama, H.M., Suzuki I. 1 1988, no month, Biotechnology and Bioengineering, vol. 32, pp. 110-116.
3. Paper entitled Bacterial Leaching of a Sulphide Ore by Thiobacillus Ferrooxidans and Thiobacillus Thiooxidans, Part II: Column leaching studies. By Lizama, H.M., Suzuki, I. 1989, no month, Hydrometallurgy, vol. 22, pp. 301-310.

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