METHOD OF DRY CONCENTRATION OF WOLLASTONITE ORE Russian patent published in 1999 - IPC

FIELD: mineral concentration. SUBSTANCE: method includes dry ore crushing, grinding in cone inertial crusher or in AEROFOL autogeneous mill, air particle size classification, magnetic separation with separation of garnet concentrate, electrostatic separation, separation of quartzite concentrate and quarts product. In so doing, prior to grinding ore in cone inertial crusher, it is subjected to screening with separation into size classes, with class of plus 50 mm directed for further crushing, class of minus 10 mm supplied to cone inertial crusher, and classes of plus 10, minus 20 and plus 20, minus 50 directed to X-ray luminescent separator. Lumps with low content of wollastonite are withdrawn to tailings. Then, preconcentrated ore and size class of minus 10 mm are subjected to crushing by cone inertial crusher up to minus 3 mm from which, with use of air classification, size class of minus 0.1 mm - the first wollastonite concentrate is separated with wollastonite content of 85%; size class of plus 0.1 to minus 3 mm is passed through magnetic separator to separate garnet-pyroxene concentrate, and magnetic product is supplied to rotary high-speed mill to produce ground material for air classification to separate size class of minus 0.063 mm - the second wollastonite concentrate containing not less than 90% of wollastonite. Then, size class of plus 0.063 (minus 0.5) mm is subjected to magnetic separation, where grains of garnet and pyroxene are separated, which are opened in further grinding, and tool iron. Nonmagnetic material in form of calcite, quartzite and wollastonite is dried and separated in two-stage electrostatic separator where wollastonite of needle shape is deflected to high-voltage electrode and impurities having more rounded and slightly elongated shape are repelled from high-voltage electrode and withdrawn to quartz- wollastonite concentrate, and elongated needle-like grains of wollastonite are supplied to disintegrator to be ground to size class of minus 0.040 mm - the third wollastonite concentrate with wollastonite content of 90%. EFFECT: higher quality of separation of wollastonite ore. 1 dwg