PROCESSING OF CHROMIUM ORE

摘要

PROCESSING OF CHROMIUM ORE Method for the recovery of chrome hydrate or high purity Cr2O3 from chromium ores by roasting the ore with Na2CO3 and CaO, water leaching the roasted mass, precipitating aluminum impurities from the leach liquor as Al(OH)3 and contacting the leach liquor with sulfur and NaOH in order to reduce the chromium values in the leach liquor from valence 6 to 3 to provide a chrome hydrate precipitate. The chrome hydrate precipitate is acid repulped to provide a chrome hydrate from which sodium impurities have been removed. The chrome hydrate is dried and the resulting solids are calcined to provide a high purity Cr2O3.