| 摘要 |
PCT No. PCT/FI87/00061 Sec. 371 Date Oct. 31, 1988 Sec. 102(e) Date Oct. 31, 1988 PCT Filed May 6, 1987 PCT Pub. No. WO87/06854 PCT Pub. Date Nov. 19, 1987.The invention concerns a method and an apparatus for improving the grinding result of a pressure chamber grinder. According to the method the finely divided material to be ground is fed by means of a mechanical feeder device (1) into a pressurized equalizing tank (2), the possibly clodded material is made loose by means of a rotor in the equalizing tank, and the material thus made loose is transferred into a pre-grinder (3), 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 (6), wherein it is divided into two component flows of equivalent magnitude and composition, each component flow is passed into the main grinding chamber (9) through a long accelerating nozzle (8) of its own, which said nozzle is directed so that a collision zone for the two component flows is formed in the center point of the said main grinding chamber. The method is characterized by that a solids-gas mixture ground in the main grinding chamber (9) is passed through an acceleration tube (10) into a mechanical grinder (11) in a direction corresponding to the rotation direction of the grinder rotor (13) driven by an electric motor (12), whereby pivotably mounted grinding hammers of the grinder are arranged to break up the coarser particles, moved to the outer periphery of the grinder, before their exit through a central out-flow (15) of the grinder.
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