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Fire method for enrichment of platinum group metals
PGE easily with various transition group metal alloy or intermetallic compound is formed, and the properties of thiophilic incompatibility with oxygen (but osmium, ruthenium oxide readily volatile), it is possible to high temperature chemical reactions, with the enriched Products of platinum group metals are separated from Other materials. Among the commonly used methods are melting and volatilization.
(1) Platinum group metal traps mainly lead trapping agent, iron nickel copper trapping agent, sulfur trapping agent, tin , aluminum and other metals as a trapping agent.
(2) smelting and blowing.
(3) Volatilization (gasification) enrichment The ruthenium and osmium in the platinum group metals are easily volatilized, and almost all of the platinum group metals can form volatile chlorides. According to this feature, the platinum group metal can be enriched or recovered from the ore or metallurgical intermediate product. Conversely, other metal compounds can also be volatilized to allow the platinum group metal to remain in the non-volatile material for enrichment. Common methods are: hydrazine, oxime oxidation, chlorination and carbonyl removal of nickel.
(4) Desulfurization by hot filtration and vacuum distillation.