CRYOGENIC GRINDING PLANT Russian patent published in 1995 - IPC

FIELD: grinding of materials. SUBSTANCE: cryogenic grinding plant has cooling bin 1, screw feeder 2, supply branch pipe, grinder 4 with circulating fan, discharge branch pipe 6, devices for separation of product and return of vapors of cryogenic agent to cooling bin and cryogenic agent supply device 9. All these members of the plant form closed system in common heat- and sound-insulated casing. Projection of axis of screw feeder 2 may be located in parallel with projection of axis of discharge branch pipe 6 at least in horizontal plane; screw feeder is so located that its projection (at least on the frontal plane) is covered by projections of grinder 4, discharge branch pipe 6 and devices for separation of product and return of cryogenic agent vapors to cooling bin; air chambers between screw feeder and grinder, discharge branch pipe and devices for separation of product and return of cryogenic agent vapors to cooling bin are filled with thermal bridge and other air chambers inside heat- and sound-insulated casing are filled with heat-insulating material 15. Devices for separation of product and return of cryogenic agent vapors to cooling bin may be assembled into cyclone 7 whose upper portion is built in cooling bin. Section of bin wall bounded by cyclone is perforated. EFFECT: enhanced reliability. 3 cl, 4 dwg