FIELD: production of inorganic compounds. SUBSTANCE: invention provides new method of reducing hexavalent chromium contained in chromium production residual stock. In order to ensure transformation of water- soluble compounds into water-insoluble ones, method includes steps of mixing residual stock with sulfur and indirectly heating mixture in absence of oxygen at 510-520 C for 25-30 min in tightly closed space. EFFECT: widened preparation possibilities for chromium compounds. 5 cl, 1 dwg
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