C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
39/1, 53/168, 53
C22B 11/00 (2006.01) C22B 1/08 (2006.01) C22B 9/02 (2006.01) C22B 11/02 (2006.01)
Patent
CA 1062473
ABSTRACT OF THE DISCLOSURE A procedure and apparatus for refining platinum group metal con- centrates and the separation therefrom of silver and of the majority of base metals with which they naturally occur is provided herein. In more detail the process comprises the steps of: (a) contacting a solid particulate mix- ture of base, e.g. one or more of Sb, Sn, Pb, Zn, Ca, Ni, Fe, As, Se and Te. silver and precious metal components e.g. gold, ruthenium, rhodium, palla- dium, osmium, iridium, or platinum, any of which components may be in metal- lic or chemically combined form, with a halogen containing gas (e.g., hydro- gen chloride, hydrogen bromide, chlorine or bromine) at a temperature which is below the melting point of the mixture but which is sufficiently high for the base metal and silver components to form their halides and for the halides substantially to volatilize from the solid mixture, and (b) removing the volatilized halides from the solid precious metal-containing component which remains. The apparatus provided herein for carrying out the process com- prises: (a) a gas-tight means for feeding particulate solid into a tubular vessel constructed of a refractory material; (b) a vertical shaft reaction chamber connected to the tubular vessel and having an inlet for the intro- duction of halogen-containing gas and an outlet for exhaust gases including volatilized halides; (c) heating means, disposed around the shaft reaction chamber, and (d) a discharge system, whereby precious metal-containing residue may be ejected from the reaction vessel.
222681
Oliver Raymond E.
Payne John B.
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