| 摘要 |
PCT No. PCT/FI82/00057 Sec. 371 Date Jun. 21, 1983 Sec. 102(e) Date Jun. 21, 1983 PCT Filed Nov. 17, 1982 PCT Pub. No. WO83/01915 PCT Pub. Date Jun. 9, 1983.A pressure-chamber grinder comprises a grinder chamber of substantially circular section, which chamber is provided with a feed opening for the material to be ground, fed as a gas-tight plug, and the opposite end of which chamber is provided with an outlet opening for the ground material. Tangentially directed grinding-gas nozzles are fitted and are uniformly spaced around the entire circumference of the mantle face of the grinder chamber, or at least of part of same. The object of the present invention is to force the entire material flow to rush into every grinding zone. This has been achieved so that the grinder chamber is, by means of a partition wall, divided into a pre-grinding chamber and a grinding chamber proper, the chambers being interconnected by means of at least two Laval nozzles passing through the partition wall and forming an angle with each other, whereat the material-gas jets rushing through these nozzles at a supersonic speed collide against each other at the outlet side of the Laval nozzles, thus forming there a grinding zone, to which zone the coarse fraction separated in a classifier connected to the outlet opening of the grinding chamber is returned.
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