Separating magnesium and calcium from mineral mixtures containin

Details Separating magnesium and calcium from mineral mixtures containin Separating magnesium and calcium from mineral mixtures containin

1977-09-19

1978-10-03

Hearn, Brian

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iib metal

423155, C01G 908

Patent

active

041184580

ABSTRACT:
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.

REFERENCES:
patent: 1799166 (1931-04-01), Hooey
patent: 3025131 (1962-03-01), Lerner
patent: 3085858 (1963-04-01), Trubey et al.

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