Properties of input raw materials in dressing processes. Methods of separation in the gravitational and centrifugal force field: optical and manual sorting, separation by density (heavy liquids, thin water layer, pulsating stream of water). Dressing in a magnetic field. Dressing in an electric field. Theory and technology of flotation, types of flotations, use. The specific nature of dressing energy raw materials – coals. The specific nature of dressing ore – metal and non-metal. Specific procedures for dressing and preparing ore. The specific nature of dressing secondary raw materials or recycling.