there are some polymeric and inorganic materials which have different densities
how is it possible to separate them according to their different density
Flotation is used for separation of powder components with different densities:
https://www.google.ru/search?q=flotation&newwindow=1&biw=1920&bih=940&site=webhp&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwibg-qsiJ7RAhWQeFAKHX8SATIQsAQIMw&dpr=1
Density gradient centrifugation.. but requires extensive optimization before scale-up.
I agree density and centrifuge has sepatred plasma from red blood cells. Thus flotation along with centrifuge will do it. Solubility can be added as an ingredient when both fail.
Sedimentation in liquids of intermediate density between that of powders is nearly a just density based separation technique for powders. Density also plays a major role in other particle separation techniques that are also influenced by particles size and shape; such as: sedimentation (from a less dense liquid), (wet or dry) elutriation, cyclone or hydrocyclone separation, flotation or separation by using two immiscible liquids (where the wetting behaviour plays a role of comparable significance), impingement-based separation, powder washing by liquid stream, washing the gas carried particle’s by a liquid spray (using a scrubber), and centrifugation. Density is also of some significance in percolative filtration and wet sieving (often combined with powder washing), although these techniques are mostly governed by particles' size. Dry sieving is much less influenced by density, compared with wet sieving, and consequently, is nearly just based on particles' size and shape. Density is also of some significance for electrostatic precipitation.
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