C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/212
C22B 60/02 (2006.01)
Patent
CA 1247372
TITLE PRESSURE LEACHING OF URANIUM ORES IN A CHLORIDE MEDIUM INVENTORS George P. Demopoulos Gordon M. Ritcey ABSTRACT OF THE DISCLOSURE Concurrent dissolution of both uranium and radionuclides from ores thereof has been achieved by leaching under oxygen pressure with an alkaline earth metal chloride preferrably calcium chloride solution acidified with HCl. Sulphide ores lead to sulphate ion build-up, excess of which is removed by autogenous alkaline earth metal sulphate precipitation: this has been found to allow increased solubility and extraction of radlonuclides particularly radium. Leaching times are short e.g. 4 hrs, such that radium precipitation or adsorption after dissolution is minimized. Uranium recoveries of above 95% and radium recoveries above about 90% have been obtained. The extracted radionuclides can be disposed of separately, leaving the tailings environmentally inert and suitable for backfill.
486061
Demopoulos George P.
Ritcey Gordon M.
Canadian Patents And Development Limited/societe Canadienne Des
Her Majesty In Right Of Canada As Represented By The Minister Of Mines And Resources
Thomson Alan A.
LandOfFree
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