Dry chlorination of pgm-bearing chromite ores or concentrates

Details Dry chlorination of pgm-bearing chromite ores or concentrates Dry chlorination of pgm-bearing chromite ores or concentrates

C - Chemistry, Metallurgy

22

B

C22B 11/06 (2006.01)

Patent

CA 2193783

A process for recovering PGM from PGM bearing chromite ores or concentrates comprises the steps of dry chlorinating the ores or concentrates, digesting the chlorinated ores or concentrates with hydrochloric acid to produce soluble PGM salts, filtering residual insoluble chromite ores or concentrates to provide substantially unaltered chromites and a pregnant solution containing PGM and a small quantity of other metals and recovering the PGM from the pregnant solution.

Processus de récupération des platinoïdes (PGM) des minerais ou des concentrés de chromite qui en contiennent, comportant les étapes suivantes : chloration à sec des minerais ou des concentrés, digestion des minerais ou des concentrés chlorés avec de l'acide chlorhydrique pour produire des sels de platinoïdes (PGM) solubles, filtration des minerais ou des concentrés de chromite insolubles résiduels pour obtenir des chromites essentiellement non altérés et une solution dense contenant des platinoïdes (PGM) et une petite quantité d'autres métaux et récupération des platinoïdes dans la solution dense.

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