B - Operations – Transporting – 24 – B
Patent
B - Operations, Transporting
24
B
51/1
B24B 1/00 (2006.01) B02C 19/06 (2006.01)
Patent
CA 1266981
ABSTRACT The invention concerns a method and an apparatus for improving the grinding result of a pressure chamber grinder. The finely divided material to be ground is fed by means of a mechanical feeder device into a pressurized equalizing tank, the material, which may have been clodded in the equalizing tank, is made loose by means of a rotor, and the material that was made loose in this way is transferred into a pre-grinder, wherein several grinding-gas jets are applied to the material to be ground so that the material to be ground is fluidized. The fluidized material-gas flow is passed into a bisecting device, wherein it is divided into two component flows of equivalent magnitude and composition. Each component flow is passed into the main grinding chamber through a long accelerating nozzle of its own, which said nozzle is directed so that a collision zone for the two component flows is formed in the centre point of the said main grinding chamber. The invention is characterized in that a solid-gas mixture ground in the main grinder chamber is passed through an acceleration tube into a free-flow grinder so as to reach a final product of steeper particle distribution, whereby grinding gas is passed into the said free-flow grinder through substantially tangentially directed grinding-gas nozzles, whereby the material-gas flow fed at a high velocity into a free-flow grinder is brought into a rapid circulatory movement so that, by the effect of centrifugal force, coarser material particles stay in this grinder longer and are ground more thoroughly than finer particles.
523867
Korhonen Heikki
Niemi Jouko
Pyoria Kaarlo
Kemira Oy
Korhonen Heikki
Mccarthy Tetrault Llp
Niemi Jouko
Pyoria Kaarlo
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