重選機の進歩

抄録

The rapid progress in dense media separators in recent years has been reviewed from the technical points of view. Dense media separators may be defined as the appliances composed of float-and-sink and medium recovery units. The treatment of both lump and fine is the primary requisite in coal preparation. On the contrary, the treatment of fine is more important in ore dressing. It must be emphasized that the density of medium should be regulated by adjusting the relative content of the medium solid, water and impurities without changing the total amount of the medium in a dense media system. The following items of interest have been discussed in detail:(a) the stability of dense media, (b) the types of separators, (c) feeding, (d) the treatment of products and waste, (e) the circulating media, and (f) the treatment of fines. The control of operation, especially the automatic control of both density and viscosity of medium in separatory vessels, the separation of medium from fine products, etc. may be the future problems.