METHOD OF PROCESSING QUARTZ-LEUCOXENE CONCENTRATES Russian patent published in 2010 - IPC C22B34/12 C22B1/02 C22B3/04 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of processing quartz-leucoxene concentrates containing high concentrations of rutile-quartz aggregates, and can be used to produce synthetic rutile. The method involves fluorination of the concentrate using ammonium fluoride while heating with separation of ammonia water, thermal treatment of the fluorination product with separation of silicon compounds in form of a sublimate of a ammonium silicofluoride and titanium in form of a residue of synthetic rutile and obtaining titanium and silicon dioxides in form of end products. Before fluorination, the initial concentrate is mixed with an ammonium fluoride solution with concentration of 300-400 g/l. The mixture is dried at temperature of up to 100°C and fluorination is carried out while raising the temperature to above 190°C. The fluorination product is thermally treated with separation of titanium and silicon compounds at temperature 250-280°C for 0.8-1.0 hours. The obtained residue of synthetic rutile is burnt at 800-850°C while trapping fluorine with ammonia water and obtaining an ammonium fluoride solution. The sublimate of ammonium silicofluoride is treated with ammonia water to obtain silicon dioxide with nanosized particles and the ammonium fluoride solution, which is mixed with the ammonium fluoride solution obtained from burning the residue of synthetic rutile, is evaporated to concentration of 300-400 g/l and then mixed with a new portion of the initial concentrate.

EFFECT: higher quality of synthetic rutile, reduced power consumption and obtaining silicon dioxide with nanosized particles.

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