Method for reducing hexavalent chromium in oxidic solids

摘要

An oxidic solid material containing chromium (VI) is mixed with a carbonaceous liquid compound at 20-100[deg] C, and resultant mixture is treated in the inert atmosphere in an indirectly heated reactor at 700-1100[deg] C, preferably 800-1000[deg] C. The reaction product is cooled under inert atmosphere at more than 300[deg] C, preferably more than 150[deg] C, to obtain hexavalent chromium. An independent claim is included for usage method of oxidic solid material.