COMPLEX PROCESSING OF MARTITE-HYDROHEMATITE ORE Russian patent published in 2014 - IPC C09C1/24 C22B1/24 B03B7/00 B03B9/00 C01G49/06 

FIELD: mining.

SUBSTANCE: proposed process comprises ore screening, magnetic separation to obtain magnetic and nonmagnetic fractions, grinding, hydraulic classification, thickening and drying. Martite ore is first subjected to screening with separation to three size classes, i.e. coarse, intermediate and fine. Coarse class is directed to sensory separation to obtain tails and concentrate to be additionally ground and screened to intermediate and fine classes. Intermediate class is conveyed to metallurgical processing while fine class is subjected to pelletising. Hydrohematite ore is first subjected to screening with separation to three size classes, i.e. coarse, intermediate and fine. Coarse class is directed to sensory separation to obtain tails and concentrate to be additionally ground and screened to intermediate and fine classes. Intermediate class is conveyed to metallurgical processing. Portion of fine class is directed for pelletising while another portion is directed to magnetic separation, its magnetic fraction is fed for pelletising. Nonmagnetic fraction is ground with mixing by grinding medium and directed to hydraulic classification of the first stage. Classification sands are returned to the mill. Sink is fed to second stage of classification, its sink being used as 3^rd grade pigment after thickening and drying. Sands of second classification are fed to second stage of grinding with mixing by grinding medium. Product ground at second stage is subjected to 3^rd stage hydraulic classification, its sands being dried and used as 2^nd grade pigment. Thereafter, sink is thickened, dried and used as 1^st grade pigment.

EFFECT: simultaneous production of several grades of iron oxide pigment and finished stock for metallurgy.

2 cl, 1 dwg, 1 tbl