Filter leaf
Principle
• It is an apparatus consisting
of a longitudinal drainage screen covered with a filter cloth
• The mechanism is surface
filtration and acts as sieve or strainer
• Vacuum or pressure can be
applied to increase the rate of filtration
Construction
• The leaf filter is consisting
of a frame enclosing a drainage screen or grooved plate
• The frame may be any shape
circular, square or rectangular
• The whole unite being covered
with filter cloth
• The outlet for the filtrate
connects to the inside of the frame through suction
Filter leaf Diagram
Working and
uses
Use
Use for the
filtration of slurry
which do not contain
high solid content,
about 5%, i.e. dilute suspensions
Advantages
• Simplest form of filter used for batch process
• A number of units can be connected in parallel to increase
the surface area of filtration
• Pressure
difference can be
obtained either with
vacuum or using
pressure up to
the order of 800
kilopascals
• Labour costs for operating the filter leaf are fairly
moderate
• The efficiency of washing is high
• The slurry can be filtered from any vessel
• The cake can be washed simply by immersing the filter in a
vessel of Water