| 摘要 |
In a ball tube mill having at least two chambers, the material to be ground is fed through a feed opening (1) to the first chamber (2) and, from the latter, reaches the next grinding chamber (7) in a comminuted state. The first chamber (2) is a preliminary chamber having at least one ball (4) whose diameter is in the order of magnitude of 1 m and for which there is provided a groove-shaped running surface (3) on the inner periphery of the preliminary chamber. <IMAGE>
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