Niagara Filter is a kind of the most widely used standards for the structure of sintered network. This sintered network is the five-story stainless steel wire mesh stacked together in sequence, after a new type of vacuum sintered filter material.
Vertical Leaf Filters are best selected in the following instances:
When minimum floor space for large filtration areas is required.
When the liquids are volatile and may not be subjected to vacuum.
When there is a risk of environmental hazard from toxic, flammable or volatile cakes specially secured discharge mechanisms may be incorporated.
When high filtrate clarity is required for polishing applications.
When handling saturated brines that require elevated temperatures the tank may be steam jacketed.
When the cake may be discharged either dry or as a thickened slurry.
They should be selected with care:
When the cake is thick and heavy and the pressure is not sufficient to hold it on the leaf.
When coarse mesh screens are used the filtration step must be preceded with a precoat to retain cakes with fine particles. Precoating with a thin layer of diatomite or perlite is not a simple operation and should be avoided whenever possible.
The cloth or woven mesh screens that cover the leaves of horizontal tanks may be accessed easily once the stack is pulled out of the vessel. This allows thorough washing of the medium with high impact jets manually in case that the cake bridges between the leaves. On vertical tanks the head cover must be unbolted and removed in order to access the leaf stack.
Mechanically simple since there are no complex sealing glands or bearings.
High headroom is required for dismantling the leaves on vertical vessels.
Large floor space is required for discharging the cake on horizontal vessels.
The emptying of the vessel in between cake filtration, washing and drying requires close monitoring of the pressure inside the vessel to ensure that the cake holds on to the candles
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In most of the fine chemicals processes the leaves are fitted into vertical vessels whilst horizontal vessels are used in the heavier process industries such as the preparation of sulfur in phosphoric acid plants. The leaves inside horizontal tanks may be positioned either along the tank axis or perpendicular to the axis.
In order to utilize the tank volume for maximum filtration area the width of the leaves is graduated so they fit to the circular contour of the tank. This also reduces the slurry heel volume that surrounds the leaves.
The vessels are fitted with highly secured cake discharge openings to ensure safe sealing of the tank under pressure. The cake that accumulates on the leaves may be discharged as a wet thickened sludge or as a dry cake. For wet cakes the vessel will normally have a small outlet that is fitted with a valve whilst for dry cakes the opening is large and the closure locks up electrically or hydraulically with a bayonet wedge.
The head cover of vertical vessels is often pivoted so that it is swung away to allow the upwards removal of the leaves in the stack. It is good practice to design a special rig that will support a leaf that is removed from the vessel.
Special quick opening bolts are fitted around the cover so that tightness is secured during operation but enable easy opening when access to the stack is required.
Package: in wood case
Delivery Time:5-25 days