FIELD: industrial organic synthesis. SUBSTANCE: method is accomplished by alkali treatment of chromium ore in oxygen-containing atmosphere, leaching of resultant cake by water and chromate-containing aqueous solution, filtration separation of insoluble components from leaching solution, and two- step isolation of desired product. The latter operation is effected first in atmosphere with oxygen content at least 5 vol % at 1000-1400 C and then in atmosphere with oxygen content at least 50 vol % at 900-1070 C. EFFECT: intensified process. 7 cl, 6 dwg
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