Liquid / solid and liquid / liquid separation of non-homogeneous mixture of solid particles mainly involving materials and liquid materials.
Mechanical separation process is mainly physical process, separate from the merits of mechanical separation and separated the physical properties of materials have great relations. If the use of the principle of separation of the settlement gravity settlement or settlement of centrifuges and solid phase particles size distribution, solid density, particle shape and the liquid density, viscosity and surface tension, all closely related. The settlement of various mechanical separation based on the scope of adaptation to the nature of materials. Filtering methods used to separate the various mechanical filtration with the solid phase material particle size distribution of compressible material, particle size and particle shape of the surface area and the liquid viscosity, surface tension and solid-liquid phase between the pro - and the closely related degree. To simplify, suspended particles of solid phase in liquid phase deposition rate and the suspension of the filter cake production rate to reflect the integrated nature of the materials, materials used to determine the degree of difficulty.
       According to the settlement and filtration tests reflect the characteristics of the materials can be chosen as the basis for separating machinery types.
       Some materials were isolated and unique nature of separation from the products of some special requirements, selection must be considered, such as:
 
(1) is a volatile liquid, or easily cause an explosion and flammable materials, not by vacuum filtration, and confined explosion-proof requirements.
(2) highly corrosive materials, mechanical separation of the right to choose a special request.
(3) solid phase particles larger hardness, requires mechanical materials selected from the wear resistance.
(4) The separation of materials, whether liquid or solid phase, if the materials are expensive, require a high recovery rate.
(5) materials for solid-phase crystallization products for the separation, crystallization damaged low level. This separation of the mechanical structure and discharge forms, methods have special requirements.