| 摘要 |
<p>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.</p> |
