Microbial dissolution of a low grade Indian chalcopyrite ore using mixed culture of Mesophiles

Anand Ram, S and Abhilash, and Mehta, K D and Pandey , B D and Mankhand, T R (2008) Microbial dissolution of a low grade Indian chalcopyrite ore using mixed culture of Mesophiles. In: International Seminar on Mineral Processing Technology (MPT-2008) , April 22-24, 2008, Trivandrum,INDIA.

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An enriched culture of mesophiles namely, Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans derived from mine water of Malanjhkhand Copper Project (MCP), India in the ratio of 4:1, and adapted on 5%(w/v) ore at 35oC was used for the bioleaching of a low grade chalcopyrite ore (0.27% Cu). Optimum copper recovery of 91% was achieved at 1.5pH and 10% (w/v) pulp density in 30days using <50μm particles. Copper recovery decreased to 82% when pH was raised to 2.5 under similar conditions. Higher copper recovery at pH 1.5 may be attributed to the improved bacterial activity (7.0x108 cells/mL), higher redox potential (666mV) and formation of minimum amount of hydronium jarosite, which was prominent at higher pH. Copper recovery was 41.2% in sterile control leaching conditions at 1.5pH. However, unadapted bacterial consortium yielded copper recovery of 69.4% only in 30 days at pH 1.5 under the above conditions. Higher metal recovery with adapted mixed culture may be attributed to increased rate of iron bio-oxidation. The biorecovery of copper from the MCP lean grade ore appeared to follow direct as well as indirect mechanism.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:bioleaching,chalcopyrite,India,mesophiles,consortia
Divisions:Metal Extraction and Forming
ID Code:88
Deposited By:Dr. Abhilash .
Deposited On:08 Oct 2009 10:45
Last Modified:01 Dec 2011 14:30
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