| abstract |
The present invention relates to a system and method for the dry extraction of fine iron oxide fractions from dense iron and semi-dense rocks, which include means of primary (5), secondary (6) and tertiary (7, 7 ') crushing to preliminarily reduce the size of ore grains containing thin iron oxide fractions in dense and semi-dense ores; fine grinding means (10, 10 ', 21) containing iron oxide ores with grinding by primary (5), secondary (6) and tertiary (7, 7') crushing, equipped with a dynamic pneumatic classifier (3.5, 4.6, 5.4); static pneumatic classification tools (11, 12, 13), arranged in series for intermediate particle size straps, and dust collectors (14) for holding fine fractions; and means of magnetic separation (15, 16, 17) using magnetic shafts (71, 72, 73), arranged in a cascade with a variable angle of inclination and formed by magnets with a strong and / or weak magnetic field. |