Column Bioleaching of a Low-Grade Silicate Ore of Uranium

Abhilash, and Mehta, K D and Kumar, Vinay and Pandey, B D and Tamrakar, P K (2010) Column Bioleaching of a Low-Grade Silicate Ore of Uranium. Mineral Processing and Extractive Metallurgy Review, 31 (4). pp. 224-235.

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The bioleaching of a low-grade Indian uraninite ore (triuranium octoxide, U3O8: 0.024%), containing ferro-silicate and magnetite as the major phases, and hematite and pyrite in minor amounts, has been reported. Experiments were carried out in laboratory scale column reactors inoculated with enriched culture of Acidithiobacillus ferrooxidans isolated from the source mine water. The pH effect on uranium recovery was examined with the same amounts of ores in different columns. With the presence of 10.64% Fe in the ore as ferro-silicate, the higher uranium biorecovery of 58.9% was observed with increase in cell count from 6.4 107 to 9.7 108 cells/mL at pH 1.7 in 40 days as compared to the uranium recovery of 56.8% at pH 1.9 with a corresponding value of 9.4 108 cells/mL for 2.5-kg ore in the column. The dissolution of uranium under chemical leaching conditions, however, recorded a lower value of 47.9% in 40 days at room temperature. Recoveries were similar with 6-kg ore when column leaching was carried out at pH 1.7. The bioleaching of uranium from the low-grade ore of Turamdih may be correlated with the iron(II) and iron(III) concentrations, and redox potential values.

Item Type:Article
Official URL/DOI:http://10.1080/08827508.2010.483380
Uncontrolled Keywords:Acidithiobacillus ferrooxidans; bioleaching; column; ferric ions; uranium
Divisions:Metal Extraction and Forming
ID Code:1872
Deposited By:Dr. Abhilash .
Deposited On:06 Oct 2010 12:17
Last Modified:13 Dec 2011 14:55
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