Subject zinc blende

Indium occurs in very. small amounts in z.ine blende, tungsten, tin and iron ores of certain localities. The recovery or indium from zinc Due dust (sometimes. I part per thousand) is effected by treating with a slight deficiency of HCI and allowing to stand The residue is subjected to a series of treatments until finally pure indium sulfttlc is obtained, a solution of which when electrolyzed yields compact indium metal. A thin surface layer of indium is used on some bearings. 

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