SPHENE PROCESSING PROCESS Russian patent published in 2008 - IPC C01G23/00 C22B3/08 C09C1/36 

FIELD: mining industry.

SUBSTANCE: invention can be used in technology of preparing titanium-containing pigments from sphene concentrate. Processing process consists in treatment of sphene concentrate with sulfuric acid solution on boiling thereby transferring titanium into liquid phase followed by isolating it into precipitate, separating precipitate, washing and calcining it to form titanium-containing pigment. Treatment is first conducted with sulfuric acid solution having concentration 850-900 g/L preheated to boiling temperature, wherein sphene concentrate micronized to the size less than 15-20 μm is subjected to treatment and introduced by small portions during 30-60 min. When initial concentration of acid solution falls to 600-650 g/L, treatment is conducted for 4-6 h under boiling conditions. Further, treatment is conducted for 1 h at 80-90°C after reduction of initial concentration of acid to 450-500 g/L to produce solution containing titanium.

EFFECT: enabled preparation of transparent, well filtering, and containing no silicic acid titanium-containing solutions suitable for preparation of pearly pigment, integrated utilization of raw material, and reduced loss of titanium dioxide.

3 cl, 7 ex