METHOD OF SYSTEM PROCESSING OF LEUCOXENE CONCENTRATE Russian patent published in 1997 - IPC

FIELD: mineral pigments production. SUBSTANCE: in production of pigment titanium dioxide from leucoxene concentrate, in order to provide system wasteless processing of concentrate, the latter is mixed with carbon reducing agent in amount sufficient to form metal carbides and mixture obtained is heated at 1600-2000 C, whereas disintegrated carbide cake is treated by aqueous nitric acid with density at least 1.05 g/cu.cm at 35-75 C resulting in silicon carbide separation. Thereafter, metal hydroxides are successively precipitated from solution. EFFECT: improved environmental condition. 1 tbl