E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/31
E21B 43/28 (2006.01) C01G 49/00 (2006.01) C22B 3/16 (2006.01) C22B 60/02 (2006.01)
Patent
CA 1198048
PROCESS FOR RECOVERY OF MINERAL VALUES FROM SUBTERRANEAN FORMATIONS ABSTRACT The present invention relates to the in situ recovery of mineral values, particularly uranium, from subterranean formations that contain sulfur in organic or inorganic forms where the sulfur causes premature deletion of an oxidant and reduction in permeability of the formation. The adverse effects due to the presence of the sulfur in the formation are substantially reduced in accordance with the present invention by treating the formations with an aqueous solution of iron-complexing agent and then oxidant to preferentially oxidize and solubilize at least a portion of the sulfur in the formation. The present process may be applied either as a pre-treatment process to be followed by a leaching process or simultaneously with the leaching process.
418260
Johnson Warren F.
Savins Joseph G.
Kirby Eades Gale Baker
Mobil Oil Corporation
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