DEVICE FOR CENTRIFUGAL-GRAVITY FLOTATION AND DESULPHURISATION OF FINE COAL Russian patent published in 2008 - IPC B03D1/24 

FIELD: engines and pumps, mining operations.

SUBSTANCE: device for centrifugal-gravity flotation and desulphurisation of fine coal includes a scumming chamber, a hydrocyclone consisting of a casing, made up of the upper cylinder-taper, middle cylinder and lower taper parts flanged together with bolts and nuts. A cylinder-taper crushed-coal aerator with a neck and Laval nozzles is flanged to the hydrocyclone input branch pipe, the hydrocyclone being tangentially inserted into the casing upper cylindrical part. The upper scumming pipe is arranged long the casing upper cylinder-taper part, the end of the latter being furnished with an annular cylindrical crushed coal perforated damper. A cylinder-taper wear-resistant material foamed product support is arranged along the lower taper part of the casing to be moved along the vertical by the screw-nut mechanism. The screw furnished with a cylinder-taper anti-wear cap is attached to the said support. The air chamber arranged in the hydrocyclone is formed by solid inner and outer perforated cylinders closed by an upper solid cover and a lower annular cover. The said chamber is divided by rectangular vertical partitions into equal number of sections all along the perimeter. The lower cover every section has a round threaded hole made along its lengthwise axis to receive the Laval nozzle screwed, via an inner thread boss, to the vertical air-feed pipe connected to the spreader pipe and, via compressed air line with a check valve and a receiver. Every section with the Laval nozzle and inner perforated wall represents an additional aerator. The lower taper hydrocyclone part communicates, via a stepwise chute, with the 1.5 m-wide 2 m-deep rectangular flotation chamber incorporating the air-lift with the aerator and is divided into two flotation sections, the chamber bottom terminating in a pyramid narrowing.

EFFECT: higher machine and flotation efficiency, fine coal desulphurisation, simpler machine design.

3 cl, 1 dwg