C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
C01G 55/00 (2006.01) B22F 9/24 (2006.01) B22F 9/28 (2006.01) C22B 5/00 (2006.01) C22B 9/02 (2006.01) C22B 9/05 (2006.01) C22B 11/00 (2006.01)
Patent
CA 2411796
A process for preparing a pure PGM (platinum group metal) from a material containing a plurality of PGM compounds, wherein the PGM is selected from the group consisting of Pt, Pd; Os; Ir, Ru, Rh and Re, and the process includes initially forming the PGM in activated form by reduction of PGM ions in aqueous solution at pH 6-8 by a reducing agent, preferably, hydrogen. Subsequently, the activated PGMs are treated by (a) reacting the material with a gaseous reactant to produce a gaseous mixture. comprising at least a first volatile PGM complex having a first decomposition temperature and a second volatile PGM complex having a second decomposition temperature, the first decomposition temperature being lower than second decomposition temperature, and a first residue; (b) separating the gaseous mixture from the first residue; (c) heating the gaseous mixture to the first decomposition temperature to produce a pure first PGM and a first volatile PGM complex-free gaseous mixture; (d) collecting the pure first PGM; (e) heating the first volatile PGM complex-free gaseous mixture to said second decomposition temperature to produce a pure second PGM axed a second gaseous mixture; (f) and collecting the pure second PGM. The process provides for the extraction and separation of PGMs in an efficacious, economic and environmentally safe manner from ores, slag, mattes and slurries.
Khozan Kamran M.
Kovtun Sergiy
Nanthakumar Victor Emmanuel
Terekhov Dmitri S.
Chemical Vapour Metal Refining Inc.
Cvmr Corporation
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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