Recovery of uranium values from uranium bearing material

Details Recovery of uranium values from uranium bearing material Recovery of uranium values from uranium bearing material

C - Chemistry, Metallurgy

22

B

53/207

C22B 60/02 (2006.01)

Patent

CA 1153562

ABSTRACT OF THE DISCLOSURE A process for recovering uranium values from uranium bearing material also containing iron and arsenic and/or clay- like minerals includes leaching the uranium-bearing material in aqueous sulphuric acid solution under oxidizing conditions to provide a slurry comprising undissolved residue and an acidic sulphate solution containing dissolved uranium values, with the residue containing clay-like minerals and/or the solu- tion containing ferric and arsenate ions. A sequence of settling operations in a series of settling vessels is carried out to effect countercurrent washing of the residue. The settling operations include feeding the slurry to a first settling vessel together with solution from the upper por- tion of a second settling vessel, removing leach solution containing uranium values from an upper portion of the first settling vessel after settling has occurred, subse- quently feeding the residue from the first settling vessel to each successive separating vessel in turn and supplying solution to each settling vessel from an upper portion of a subsequent settling vessel and allowing the residue to settle in the solution, and supplying the last settling vessel in the series with water from a source thereof. The sulphuric acid concentration of the solution in each settling vessel in at least the first half of the series is maintained at at least about 5 g/L by adding sulphuric acid to at least one of the settling vessels in the final part of the series.

358964

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