METHOD FOR REDUCING HEXAVALENT CHROMIUM IN OXIDIC SOLIDS

摘要

A method for reducing hexavalent chromium in oxidic solids containing the steps: a) mixing the oxidic solid containing Cr(VI) with a carbon containing liquid compound in the range of 20 to 100°C; b) treating the mixture obtained according to a) under a protective atmosphere in an indirectly heated reactor at a temperature of 700°C to 1100°C particularly preferably at a temperature of 800°C to 1000°C; c) cooling the reaction product obtained according to b) under a protective atmosphere to at least 300°C preferably to at least 150°C.