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Filtration precoat

VIEWS: 7 PAGES: 18

									Precoat Filtration
                Filteraid 




                               septum
    Filter cake 




PRINCIPLE OF PRECOAT FILTRATION
Filter aids
Inorganic mineral
powders or organic
fibrous materials, used
in combination with
filtration hardware to
enhance filtration
performance.
Commonly used filter
aids include diatomite,
perlite, and cellulose.
Some of these materials
have been in use for
over 75 years.
                                   Perlite
                              Perlite in the natural state is a dense
                              glassy rock formed by volcanic action.
                              When crushed and heated to over 800C,
                              it pops like popcorn, expanding to 20 or
                              more times its original volume. Milling
                              and classifi-cation process gives perlite
                              filter aids the structure and correct
                              particle size range distribution needed
                              for optimum performance.
                                           Perlite is an amorphous
                                           mineral consisting of fused
                                           sodium potassium aluminum
                                           silicate. The expansion is due
http://www.unitedperlite.com/perlite.htm
http://www.singerprocess.com/perlite.htm   to the presence combined
http://www.perlite.dk/filterai.htm         water in the crude perlite rock.
Performance improvement
Steel mesh septa
Polymeric filter septa
Woven ▲ Fiber filters   
Small filters

								
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