C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/04 (2006.01) C22B 13/00 (2006.01) C22B 19/00 (2006.01) C22B 26/20 (2006.01) C22B 47/00 (2006.01)
Patent
CA 2676273
Calcium (Ca), manganese (Mn) and magnesium (Mg) carbonate plus lead (Pb) and zinc (Zn) sulphide minerals e.g. in a sandstone host are selectively in situ leached with selected acid e.g. acetic acid to extract Ca, Mn, and Mg. Ferric salts are then employed to extract Pb and Zn. An inter relationship has been identified between pressure, temperature, target depth and leachate concentration such that carbonate leaching is performed in a manner to prevent carbon dioxide gas (CO2) discharge thereby plugging host rock permeability avenues to preclude further leaching. This requires controlling the rate of acetic acid leaching to be in step with availability of solution to dissolve the resulting discharged CO2. Sulphide leaching is subsequently conducted on the carbonate-depleted host. The two resulting leachates are chemically treated to selectively recover extracted minerals as value added industrially ready products. The method is particularly advantageous in preparing the high purity manganese products necessary for lithium ion batteries because it prevents occurrence of very fine metallic particles in the products that happens during conventional mining (such particles preclude battery operation).
Dahal Madhav P.
Geisler Robert A.
Mcfadden Fincham
Yava Technologies Inc.
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