![]() ![]() PGM's are of significant industrial value finding application, for example, as catalytic or inert materials in many chemical reactions. Typically, chromite occurs as stratiform or podiform deposits associated with ultramafic igneous rocks. Therefore, a versatile process that can recover PGM's from a variety of different feedstock materials, economically and efficiently, is very desirable. Of course, the many industrial forms of PGM's results in a large number of additional feedstock materials, other than ores, in which they may be found. Extensive deposits of platinum group metals associated with chromite bearing ores exist in the Republic of South Africa 4nd the U.S.A., in particular, the Stillwater Complex in Montana. The PGM's which include platinum, palladium, rhodium, ruthenium, iridium and osmium, are sometimes found in association with chromite-bearing ores at chromite grain boundaries, within chromite grains or in the gangue material associated with the ore and they are usually also associated with sulphides of nickel, copper and iron.
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