FIELD: chemistry.
SUBSTANCE: invention can be used in chemical engineering. The method of producing powdered bismuth (III) oxide involves oxidation of bismuth with oxygen in a revolving reactor with a controlled atmosphere. Granular bismuth is pretreated with oxygen at temperature below the melting point of bismuth. The treated bismuth is then oxidised at temperature higher than the melting point of bismuth.
EFFECT: invention enables to obtain fine highly pure powder of stoichiometric bismuth (III) oxide without a preliminary operation of removing an oxide film from the melt surface and forming a molten bismuth phase.
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