Some design aspects of the pressure-oxidation acid leaching of a Canadian uranium ore / J.A. Vezina and W.A. Gow, Extraction Metallurgy Division. : M34-20/110E-PDF

“An investigation was done to determine the amount of heat and compressed air or oxygen required to leach Elliot Lake ore by pressure-oxidation, acid leaching. The tests were done on a batch scale with the leaching being done in a 50-gallon autoclave. The results showed that 95% of the uranium was extracted from a typical Elliot Lake ore in three hours at a temperature of 302°F, a total gas pressure in the autoclave of 150 psi gauge and an oxygen partial pressure of about 9 psi absolute. To maintain these conditions when the oxygen is supplied as compressed air would require 2207 cubic feet of dry air and 310,929 BTU per ton of ore. Conditions to obtain up to 96% uranium extraction in as little as two hours were also determined. The highest extraction rates and extractions, which were obtained with oxygen partial pressures of about 20 psi absolute, would necessitate the oxygen being supplied as compressed oxygen. The cost of heat and compressed air or oxygen to extract 95-96 per cent uranium in 2 to 4 hours by acid pressure oxidation would be in the range of $0.39 to $0.57 per ton of ore treated"--Abstract, p. i.

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