Oxidative roasting of sheet metal concentrate
Gold telluride in sheet metal concentrate can be decomposed after long-term cyanidation in alkaline cyanide solution, but pre-calcined
Au 2 Te+O 2 
2Au+TeO 2
The gold is reduced to a metallic state and is more easily decomposed.
Further, when telluride symbiotic pyrite sulfides, etc., by firing at the same time to remove them.
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