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CAT NO: DIDACTICNLE-Export-210042
Plate and Frame Filter Press- Engineering Lab Training Systems.
Technical Description
Plate and frame filter presses are used in the beverage industry, for example, to clarify intermediate products.
A
suspension of diatomite and water (recommended) is prepared in a
stirred tank. The stirrer ensures that the solid remains suspended and
does not settle. A pump delivers the suspension into the individual
separating chambers of the plate and frame filter press. A separating
chamber is formed by one filter frame and two filter plates. The filter
plates are grooved and covered over with filter cloths. The filtrate
passes through the filter cloth and flows via the grooves in the plates
into a collecting pipe. The filtrate exits the plate and frame filter
press through the collecting pipe and is collected in the filtrate tank.
The solid material is separated off at the filter cloth, where it forms
a growing filter cake. As the filter cake becomes thicker, its flow
resistance also increases. When the separating chamber is full, or a
maximum pressure difference has been reached, the filtration process is
ended. The plates and frames of the plate and frame filter press are
pulled apart. The filter cake can be removed. For the next filtration
the plates and frames must be pushed back together. A spindle is used to
press them together. The press forces ensure that the suspension does
not leak from the contact points between the plates and the frames, but
is forced through the filter cloth.
The flow rate
through the plate and frame filter press is adjusted by a valve. The
pressure occurring during filtration is indicated on a manometer. The
filtrate tank is scaled. This means a stopwatch can be used to measure
the flow rate. An included opacimeter allows the solid concentration of
the filtrate to be determined. A drying chamber is recommended for
evaluation of the experiments.
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