Metals recovery from serpentine ores

Details Metals recovery from serpentine ores Metals recovery from serpentine ores

C - Chemistry, Metallurgy

22

B

C22B 26/22 (2006.01) C22B 3/00 (2006.01) C22B 3/10 (2006.01) C22B 23/00 (2006.01)

Patent

CA 2378721

A method for the recovery of nickel, cobalt and magnesium oxide from serpentine ores, such as the mine tailings from asbestos mines, in one type of operation by a series of steps including grinding the serpentine ores to yield granules; magnetically enriching the granules to produce a magnetic concentrate; digesting the magnetic concentrate in concentrated hydrochloric acid to produce an acidic reaction mixture comprising water soluble metal chlorides and an insoluble residue; filtering the acidic reaction mixture to provide a filtered solution of the water soluble metal chlorides; precipitating and filtering ferric oxide and chromium oxide from the filtered solution providing a second filtered solution; selectively recovering nickel, cobalt and magnesium oxide from the second filtered solution with the concomitant formation of gaseous hydrochloric acid which is recycled to the acid digesting step.

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