Autoclave leaching of refractory uranium minerals

Sreenivas, T and Rao, K Anand and Rao, M Manmadha and Rajan, K C and Serajuddin, Md. and Karthikayini, P and Padmanabhan, N P H (2010) Autoclave leaching of refractory uranium minerals. In: Proceedings of the XI International Seminar on Mineral Processing Technology (MPT-2010), Dec 2010, NML Jamshedpur, India.

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Hydrometallurgy is the predominant process route used for the recovery of uranium values from its ores and leaching is the critical step amongst the various unit operations involved. Although simple uranium minerals like uraninite and pitchblende are readily leached with acid or alkali leachants under atmospheric pressure conditions, however refractory phases of uranium are very difficult for dissolution. In addition, some uranium ores yield low leach recovery due to the physical nature of uranium mineralization. Autoclave circuits have been proven as reliable unit processes that increase leach efficiencies resulting in stabilized and environmentally least harmful leach residues. Sustained R & D efforts in BARC have resulted in possibility of applying autoclave-leaching for the dissolution of uranium from refractory minerals (viz. betafite, liandratite) and ores with extremely fine dissemination of uranium phases, using both acid and alkaline leaching technology. An overview of these results is discussed in this paper.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:
Uncontrolled Keywords:Uranium, Leaching, Autoclave, Pressure, Mineral processing.
Divisions:Mineral Processing
ID Code:2427
Deposited By:Dr. A K Sahu
Deposited On:28 Jan 2011 11:12
Last Modified:16 Nov 2011 11:51
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