Precoat Filtration
description
Transcript of Precoat Filtration
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Precoat FiltrationPrecoat Filtration
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Filter cake
Filteraid
septum
PRINCIPLE OF PRECOAT FILTRATION
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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.
Filter aids
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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.
http://www.unitedperlite.com/perlite.htmhttp://www.singerprocess.com/perlite.htmhttp://www.perlite.dk/filterai.htm
Perlite is an amorphous mineral consisting of fused sodium potassium aluminum silicate. The expansion is due to the presence combined water in the crude perlite rock.
Perlite
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Performance improvement
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Steel mesh septa
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Polymeric filter septa
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Woven ▲ Fiber filters
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Small filters
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