| 摘要 |
An installation for grinding minerals and other solid inorganic materials includes a crushing roll set (10), comprising a pair of grinding rolls (11, 12) having respective rotation axes (13, 14) parallel to each other and arranged flanked so to define an entrance space (15) between them. The entrance space has a minimum section (SA) at the plane containing the rotation axes. The installation also comprises a feed mouth (17) adapted to feed, by gravity, a feed material to be ground in the entrance space. The installation moreover comprises a precompression screw (20) arranged at the feed mouth. The screw is adapted to compress the feed material against the grinding rolls and is arranged to allow the discharge of the air which exits from the material to be ground due to the precompression.
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