Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group ib metal
Patent
1992-05-11
1993-08-24
Morris, Theodore
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group ib metal
423 22, 423 39, 423 38, 423 40, 423 48, 75633, 75632, 75637, 75736, 75744, C01G 700, C01G 5500
Patent
active
052386627
ABSTRACT:
Disclosed is a process for recovering precious metals using a combination of smelting and an effective utilization of molten salt chlorination. More specifically, disclosed is a process including the steps of (i) contacting, for example, a matte with a chloride salt containing at least one of potassium, cesium or rubidium, but not sodium or lithium to form a matte/salt solids mixture, (ii) introducing the solids mixture into a chloride melt having a temperature ranging from 300.degree. C. to 650.degree. C., said melt containing at least one of potassium, cesium, rubidium, sodium or lithium, (iii) introducing a chlorine containing gas into the melt, and (iv) maintaining the salt ratio in the matte/salt mixture at a stoichiometrically equivalent amount with the precious metals and base metals contained in the matte. Also disclosed is a selective dissolution technique which involves multiple dissolution stages wherein each stage the oxidation potential is maintained at a certain level and an alkali metal chloride is added such that platinum and palladium can be separately recovered.
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Chevron Research Company
Davis M. L.
Morris Theodore
Sheridan R. J.
Squillante Edward
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