| 摘要 |
<p>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 filter ed solution of the water soluble metal chlorides; precipitating and filtering ferric oxi de 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 aci d which is recycled to the acid digesting step.</p> |
