C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/168, 53/372,
C22B 9/00 (2006.01) C22B 3/08 (2006.01) C22B 11/00 (2006.01)
Patent
CA 1061573
ABSTRACT OF THE DISCLOSURE A process and apparatus for refining platinum group metal concen- trate and the separation therefrom of silver and the majority of base metals which are present in them are provided herein. The process aspect comprises the steps of: (a) contacting a solid particulate mixture of base metal, silver and precious metal components, any of which may be in metallic or in chemically combined form, with substantially anhydrous sulphuric acid at a temperature which is sufficiently high (e.g. from 140°C to 250°C) to convert most of the base metal and silver components to water soluble sulphates while leaving the precious metal components in an essentially water insoluble solid state and (b) separating the water soluble sulphates from the solid precious metal-containing components by contacting the product from step (a) with water (e.g. in the form of a dilute aqueous mineral acid solution) and dis- solving therein the water soluble sulphates formed in step (a). The appara- tus for carrying out the above process comprises: (a) reaction chamber having (b) separated inlet means for particulate solid and substantially anhydrous sulphuric acid; (c) means for stirring together the solid and the acid in the reaction chamber, and (d) outlet means for product, the outlet means having an opening into the chamber above the level of the sulphuric acid-solid mixture. This provides a simple and effective refining process and apparatus whereby a substantial portion of the silver and base metal components present in the mixture are separated from the precious metal com- ponents, and the concentration of the precious metal is thereby significantly increased.
222680
Mcguire George
Oliver Raymond E.
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