In situ leaching

Details In situ leaching In situ leaching

E - Fixed Constructions

21

B

166/30

E21B 43/28 (2006.01) C22B 60/02 (2006.01)

Patent

CA 1130199

GC 91 ABSTRACT In Situ Leaching The present invention relates to in-situ leaching or uranium, particularly employing an acidic leach liquor containing an oxidant, and especially in respect of ores containing significant amounts of transition metals that act as catalysts for peroxidant decomposition When hydrogen peroxide is used as oxidant under such conditions it decomposes leading to the formation of gas bubbles and exacerbation of ore-blinding, and a reduction in the efficiency of extraction of uranium. The present invention employs peroxymonosulphuric acid as oxidant and thereby ameliorates the problems aforesaid. Preferably, additionally, sulphuric acid is present in the leach liquor and in many preferred embodiments the peroxymonosulphuric acid concentration is from 0.001 to 0.03 moles/litre and the sulphuric acid from 0.025 to 0.075 moles/litre.

337998

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