| 摘要 |
A process for granulating metal received in sheet form, such as cathode copper, operates in two stages. In the first (prime cutting) the sheet is advanced and pieces are taken from its leading edge by a shear comprising a rotor with at least one blade co-operating with a fixed blade across which the sheet metal is fed. In the second operation, (digestion) the pieces formed in the first operation are fed to a granulator (or to more than one granulator) of the kind comprising a rotor with at least one blade co-operating with at least one fixed blade to comminute the material repeatedly until the particles are small enough to pass through a screen bounding the working zone. The two operations can be optimised independently, and substantial energy saving is achieved compared with the direct feeding of the sheet metal to the granulator. In the case of copper, the extent of heating, which in conventional granulation may lead to surface oxidation, is greatly reduced. |
