| 摘要 |
<p>The method involves initial coarse grinding of the solids in a controlled vortexing of a fluidized bed and directing the solid fine particles upwardly into a vortex grinding zone and grinding the upwardly directed solid particles in the vortex grinding zone by passing a portion of the particles through the vortex grinding zone. The vortex grinding zone comprises at least one successively vertically disposed grinding stage comprising passing particles upwardly through at least one horizontal vortex zone of an annular gap, defined by a stationary plate with a circular aperture. The upward moving product mix is cleaned up by eliminating coarser particles by gravity separation with a centrifugal expelling fan. The remaining part of the upward particles is subjected to the vertical vortexing of a rotating semipermeable device, defined by a rotating assembly containing a broad mesh screen in it.</p> |
