METHOD OF ENRICHING ANATASE MECHANICAL CONCENTRATES TO OBTAIN SYNTHETIC RUTILE WITH LOW CONTENT OF RARE-EARTH AND RADIOACTIVE ELEMENTS Russian patent published in 2011 - IPC C01G23/08 C01G23/47 C09C1/36 C22B3/08 C22B3/10 C22B3/22 

FIELD: chemistry.

SUBSTANCE: method of enriching anatase mechanical concentrates involves burning (1) an anatase concentrate in a fluidised bed furnace or a drum furnace; reducing (2) the burnt product in the fluidised bed furnace or drum furnace using a hydrogen or natural gas as a reducing agent; dry and wet separation (3) of the reduced product in a weak magnetic field in magnetic separators fitted with a permanent magnet and a drum, where the magnetic fraction formed during reduction is discarded; dry separation (4) in a strong, high-gradient magnetic field of the magnetic fraction obtained during separation in a weak magnetic field in roller or drum separators with a rare-earth permanent magnet, with extraction of silicates, secondary phosphates, monazite, calzirtite, zircolinite and uranium and thorium-containing minerals; leaching (5) of the magnetic fraction obtained from separation in strong magnetic field in mixing tanks or fluidised bed columns, with a hydrochloric acid solution; filtering the leached product on a belt filter; drying of the filtered product in a rotary drier or fluidised bed drier; oxidation (6) of the dried product in the drum furnace or fluidised bed furnace; fast cooling of the oxidised product in water or compressed air in a drum cooling device or by immersing in water; leaching (7) the fast-cooled product in mixing tanks or columns, or with hydrochloric acid or sulphuric acid; filtering the product from the second leaching (7) on a belt filter; and drying of the filtered product in a rotary or fluidised bed drier; and final dry separation (8) of the product of the second leaching in a strong, high-gradient magnetic field in roller or drum separators with a rare-earth permanent magnet, while discarding the magnetic fraction and extracting the non-magnetic fraction as the final product (P), i.e. the synthetic rutile.

EFFECT: invention enables to obtain synthetic rutile with low content of rare-earth and radioactive elements while lowering production costs.

28 cl, 3 dwg, 4 tbl, 4 ex