Bioleaching of a Copper Sulphide Concentrate by two different Strains of Acidophilic Bacteria

Mehta, K D and Pandey, B D (2012) Bioleaching of a Copper Sulphide Concentrate by two different Strains of Acidophilic Bacteria. In: 16th International Conference on Non-Ferrous Metals-2012, July 13-14, 2012, Hotel Le Meridien, New Delhi.



Two strains of acidophilic Thiobacillus generae, one isolated from the water of a copper mine and another, a pure culture have been used for the processing of a sulphidic copper concentrate with 14.13% Cu, 10.04% Ni, 0.33% Co, 0.71% Mo, 2.28% Fe, 36.4% S and 1.72% 5102 generated at UCIL Jaduguda, India. The concentrate has chalcopyrite and pentlandite as the major phases along with pyrite, pyrrhotite, violarite, millerite and moly-bdenite as the minor phases. The unadapted isolated culture of Acidithiobacillus ferrooxidans dissolved 41% Ni and 35% Co at 308K and pH 2.0 in 60 days from the mixed size (<200 gm) particles. Pyrite (10 wt%) was found to be an effective additive resulting in bioleaching of 81% Ni and 45% Co under above condition; biorecovery being high (90% Ni and 61% Co) from the finest size particles (<50 /an). A. ferrooxidans strains of another source (OU, Hyderabad) adapted over copper concentrate serially for four times at 2.3 pH and used for leaching, improved the kinetics showing biorecovery of 83% Ni and 88% Co in 30 days only with the mixed size particles.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:
Uncontrolled Keywords:Pyrite; complex sulphide concentrate; bioleaching; bacteria; redox potential
Divisions:Metal Extraction and Forming
ID Code:6310
Deposited By:Sahu A K
Deposited On:25 Dec 2012 11:04
Last Modified:25 Dec 2012 11:04
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