| 摘要 |
Ores or mineral mixtures containing zinc sulphides and magnesium and/or calcium in the form of carbonates, oxides and/or hydroxides are leached with an aqueous sulphur dioxide bearing solution to selectively dissolve magnesium and/or calcium leaving the zinc sulphides in the undissolved residue in concentrated form. During the dissolution reaction, the pH is maintained within the range of about 1 to about 4 by the addition of sulphur dioxide to the leach solution at a rate at least sufficient to replace sulphur dioxide taken up in the dissolution of magnesium and/or calcium thereby promoting selective dissolution of the magnesium and calcium compounds and non-dissolution of the zinc sulphides.
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