METHOD FOR REDUCING HEXAVALENT CHROMIUM IN OXIDIC SOLIDS

摘要

The invention relates to a method for reducing hexavalent chromium in oxidic solids, having the following steps: a) heating the oxidic solid, which contains Cr(VI), to a temperature of 600 to 1400 °C in an atmosphere containing less than 0.1 vol.% of an oxidizing gas and b) cooling the reaction product obtained according to step a) to a temperature below 100 °C in an atmosphere containing less than 0.1 vol.% of an oxidizing gas. The invention is characterized in that no reducing agents are added to the oxidic solid or to the atmosphere in steps a) and b) in the method.