Process for separating, according to specific gravity, of mixtures of solid materials, the particles of which differ mutually in size and specific gravity, especially of coal-containing mixtures

摘要

A mixture of solid particles which differ in size and specific gravity is floated in a liquid the specific gravity of which is between the specific gravities of the particles to be separated and is then treated under pressure in a cyclone separator. Liquids mentioned are solutions of potassium and calcium salts and organic fluids such as trichlormethane, tetrachlormethane and tetrachlorethane. Specification 528,590 is referred to.