METHOD OF CHROMIUM-BEARING MATERIAL PROCESSING Russian patent published in 1997 - IPC

FIELD: production of chromium concentrate for ferroalloy production. SUBSTANCE: screening initial material to size is exercised to separate particles size of less than 2 mm. Remaining mass of product is subjected to selective grinding till, at least, 70 % of chromates are turned into small size of particles. Then produced ground mass is subjected to repeated sizing to separate size of particles less than 2 mm. EFFECT: method allows to separate less than 2 mm size of particles. 1 tbl