| 摘要 |
A ball mill including the usual drum and a trommel screen rotatable therewith together with mechanism for returning damaged balls and large pieces of aggregate directly from the trommel screen to the drum. This mechanism comprises a plurality of blades mounted on the inner surface of the cylindrical screen which pick up material in the trommel screen as an incident to rotation thereof and dump it onto a trough which extends from the screen to the drum. A jet of water is introduced into the trough at its outer end and passes the materials back into the drum.
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