. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. ly be used for the finer sizes. Fine Classification. — We have seen how the coarser grains of ore are sized by means of trommels and screens into groups of grains of equal volume, and now/^ yY yy have to deal with the finer grains, which cannot be handled in trom-mels, but must be classified, not ac-cording to their volume and density, but accordingto the rate at which they will fall through a givendepth of water as already explained. An hydraulic classifier for carrying out th
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. ly be used for the finer sizes. Fine Classification. — We have seen how the coarser grains of ore are sized by means of trommels and screens into groups of grains of equal volume, and now/^ yY yy have to deal with the finer grains, which cannot be handled in trom-mels, but must be classified, not ac-cording to their volume and density, but accordingto the rate at which they will fall through a givendepth of water as already explained. An hydraulic classifier for carrying out thisprinciple, is shown in figs. 192 to 193, which arereduced from actual drawings of an apparatus whichI once constructed, and successfully used of thiskind, the original drawings being supplied by thefirm of German machinists who supplied the ma-chinery. The classifier supplied the mineral to twofive-compartment percussion lever jiggers. The slimes which arrived atthe smaller or inlet end, shown by the arrow on the plan (fig. 192), spreadthemselves out with gradually decreasing velocity, the heavier and larger. Fig. Screen for Batteries.
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