Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ib metal
Patent
1997-02-25
1998-07-21
Bos, Steven
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ib metal
423 45, 423 27, 423 29, 423153, 4231501, C22B 1100, C22B 1108, C22B 100
Patent
active
057831580
ABSTRACT:
The ore which contains gold and/or silver and as accompanying metal at least iron is calcined at temperatures in the range from 500.degree. to 900.degree. C. with the addition of oxygen-containing gas. There is obtained a metal-oxide-containing solids mixture and a SO.sub.2 -containing exhaust gas. The solids mixture from the calcination is cooled, the temperature being reduced by at least 50.degree. C. The cooled solids mixture is added to a fluidized-bed reactor, and SO.sub.2 -containing exhaust gas is introduced into the fluidized-bed reactor. In the reactor, metal sulfate is produced in the solids mixture, so that at least 10% of the sulfur content are bound in the exhaust gas. Solids mixture containing metal sulfate is withdrawn from the fluidized-bed reactor, is stirred up with an aqueous acid solution, thereby dissolving metal sulfate. The remaining solids are supplied to a recovery of gold and/or silver.
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Pierson Walter
Stolarski Eberhard
Tacke Michael
Bos Steven
Dubno Herbert
Metallgesellschaft Aktiengesellschaft
Myers Jonathan
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