METHOD FOR REDUCTION OF HEXAVALENT CHROMIUM CONTAINED IN OXIDE SOLID MATERIALS Russian patent published in 2018 - IPC C01G37/00 C22B1/02 C22B7/00 C04B14/30 C04B18/04 C08L95/00 B09B3/00 

FIELD: chemistry.

SUBSTANCE: method for reduction of hexavalent chromium in oxide solid materials involves mixing of an oxide solid material containing Cr(VI) with a carbon-containing compound. The resulting mixture is then treated in a protective gas atmosphere in an indirectly heated reactor at a temperature of 700 to 1100°C and the reaction product is cooled in a protective gas atmosphere to at least 300°C. As the carbon-containing compound, a liquid compound is used in a temperature range of from 20 to 100°C.

EFFECT: invention allows to dispose the remnants of chromite ore by converting the hexavalent chromium, which is difficult to access and insoluble in water, to trivalent chromium.

32 cl, 2 tbl, 6 ex