The fluid/is solid, the fluid/fluid non- homogeneous phase mixtureseparation mainly involves the solid phase pellet material and theliquid phase material.

The mechanical separation process mainly is the physical process,separates the mechanical separation performance the fit and unfitquality, with is separated the material the physical performance tohave the enormous relations. If carries on the separation using thesubsidence principle the gravitational settling or the subsidence typecentrifuge and the solid phase pellet grain-size distribution, thesolid phase density, the grain shape as well as the liquid phasedensity, the viscosity and the surface tension and so on closely isconnected. Each kind of subsidence type separates the machinery theadaption scope also to divide based on the material nature. Withfilters the method to carry on the separation each kind to filter themachinery then with the solid phase material grain-size distributioncondition, the material may the compression, the grain shape and thepellet group relative surface accumulates as well as between theliquid phase viscosity, the surface tension and solid liquid phasekissing with the degree and so on the close correlation. In order tosimplify, may determine the solid phase suspended particle filters inliquid phase subsidence speed and the suspending liquid filters thecake production speed, in order to the synthesis reflection materialnature, with determines the material the difficulty degree.

According to subsides and filters the laboratory to reflect thematerial characteristic, may take the choice separation mechanicaltype the basis.

Is separated the material some special nature and to separates theobtained product some special requests, when shaping must perform toconsider, for example:
(1) the liquid phase is when the easy volatility or is easy to causethe detonation and Flammability the material, cannot use Filter,also the request airtight guards against explosions.
(2) a corrosive stronger material, to separates the mechanicalmaterial the choice to have the special request.
When
(3) solid phase pellet degree of hardness bigger, then requeststo choose the separation mechanical material the resistance to wear tobe good.
(4) is separated the material, regardless of is the solid phase or theliquid phase, if belongs to the precious material, then the requestreturns-ratio is high.
(5) the solid phase material for when crystallizes the product, whenrequest separation crystallizes damages the degree to be low. Thishalf to the machinery structure and Discharge the way, the method all hasthe special request.