Abstract
In the first series of experiments in this study, the motion of specim-en particles in Baum-type jig under operation was examined in relation to specific gravity, shape and size.The author acertained that the seperation of particles was carried out following the jiging-principle based on the known equation dv/dt=g (s-1/s) i.e.the seperation was carried out principally according to their specific gravity, but was independent of their shape and size.
Acording to the above mentioned result, the author made clear how to design and control the Baum-type jig to adapt to the grade of row coal and how to calculate the capacity of jig with the mean velocity of particles obtained from preliminary sink-and- float test.
In the second series of experiments, size and ash distribution of coal in the various section of wash box were examined.The author explained the state of stratification of coal and gave some considerations on the mechanism of wash-box.
