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Mathematical Models and Design Methods in Solid-Liquid Separation (Hardcover, 1985 ed.)
Loot Price: R5,815
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Mathematical Models and Design Methods in Solid-Liquid Separation (Hardcover, 1985 ed.)
Series: NATO Science Series E:, 88
Expected to ship within 10 - 15 working days
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The separation of finely-divided solids from liquids constitutes an
important stage in many industrial processes. Separation of
mixtures ranging from highly concentrated slurries to slightly
turbid liquids must be effected in circumstances where the solids,
liquid or both phases may have value. Separations may be achieved
by use of a membrane or filter medium which, positioned in the path
of a flowing suspension, will allow passage of the fluid whilst
retaining solids on the surface or within the medium. Alternatively
the two phases may be separated by sedimentation processes
involving gravitational or centrifugal force. In either mode,
separation difficulties are sometimes experienced with the result
that solid-liquid separation is often a bottleneck in commercial
plants. Operational difficulties and plant failures are associated
with the random nature of the particles being separated; variations
in size, shape, states of aggregation, compressibility, etc. ,
produce a wide range of problems. Plugging of the filter medium or
the collapse of the solids under applied stress lead to slow
flowrates of liquid. The colloidal nature of some precipitates
makes separation by settling virtually impossible without the use
of chemical agents to enhance the size of basic units and to reduce
repulsive surface forces. Unit operations such as filtration,
comminution, etc. , involve a seemingly bewildering array of
machines which makes plant selection a difficult step and reflects
the uncer tainties attaching to operations involving the solid
)hase. Many types of pressure, vacuum and centrifugal filter are
available.
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