Process for the winning of osmium and ruthenium from precious metal concentrates

摘要

A method for extracting osmium and ruthenium from noble metal concentrates, by:a) treatment of a noble metal concentrate containing osmium and ruthenium with nitric acid at a maximum temperature of about T=+30° C.,b) heating of the resultant suspension/solution to a minimum temperature of about T=+85° C.;c) capturing the resultant osmium tetroxide in an absorption solution;d) treatment of the suspension/solution having a temperature of about T=+20° C. to 30° C. with hydroxide at a maximum reaction temperature of about T=+65° C.; ande) treatment of the alkaline suspension/solution from step d) with a substance for the oxidizing leaching of the ruthenium.