Method for extracting osmium and ruthenium from noble metal concentrates
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United States of America Patent
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Nov 5, 2002
Grant Date -
Jul 5, 2001
app pub date -
Jan 4, 2001
filing date -
Jan 5, 2000
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Abstract
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.degree. C., b) heating of the resultant suspension/solution to a minimum temperature of about T=+85.degree. C.; c) capturing the resultant osmium tetroxide in an absorption solution; d) treatment of the suspension/solution having a temperature of about T=+20.degree. C. to 30.degree. C. with hydroxide at a maximum reaction temperature of about T=+65.degree. C.; and e) treatment of the alkaline suspension/solution from step d) with a substance for the oxidizing leaching of the ruthenium.
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