ABSTRACT
The rapid rates require filtration with continuous
vacuum filters or, for small-scale production, with
batch filters. Medium-filtering slurries are those that
can be kept in suspension by gentle stirring. With
these slurries, a 3-to 5-cm cake is formed with
vacuum in about a minute. Rotary drum, Nutsche,
or batch pressure filters can be used, depending on
the production scale. If a high degree of washing is
required, a plate-and-frame type may be most cost-
effective. Slow-filtering slurries require pressure filters,
generally of a batch type, to increase flow rates.
Dilute slurries include those that do not form a cake
that is quick enough to be discharged from a continu-
ous filter. The selection depends on such factors as the
scale of production, the water content of the cake,
and the amount of washing that is required.
