SCREENING METHOD FOR FINE MATERIAL BY DENSITY AND CONCENTRATOR FOR ITS IMPLEMENTATION Russian patent published in 2008 - IPC B03B5/32 B03B7/00 

FIELD: processes; mining.

SUBSTANCE: screening method by density of fine unsized material with extraction of concentrate and tails includes classification and separation in centrifugal field. Unsized fine material is fed as pulp under pressure not less then 0.05 MPA into feeding device of centrifugal separator, implemented in the form of hydrocyclone. Sands of hydrocyclone are directed inside of conical rotating bowl, and discharge after blending with condensing water or compressed air, in the form of emulsion, is fed into accumulation zone and concentrate discharge. Feeding of these compounds depending on chosen mode can be implemented under pressure created by bowl rotation or by compressed air, permanently or pulsed and cyclical, with emulsion receiving and formation in accumulation area of semi-boiling medium of reduced viscosity and density. Method is implemented in centrifugal concentrator, including driver, bowl connected to hollow control shaft, body with circular section, facilities for charging and discharging of separation products, feeding of compressed air, condensing and wash water. Concentrator is outfitted by conglobated disk and mixing chamber, installed on the end of hollow driving shaft and connected to emptying fitting of feeder, implemented in the form of hydrocyclone with sand neck located inside of internal hollow shaft of discharging device, under which it is installed conglobated disk, rigidly bound to bowl and forming with it divided by blades ring channel, communicating to mixing chamber.

EFFECT: increasing of hard-cleaning heavy metals and minerals extraction and reduction of investment and operating costs.

4 cl, 2 dwg