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Filtration
The filtration cycle starts by pumping slurry into all the filtration chambers simultaneously.
The filter cake is formed as filtrate is displaced from the chamber by more slurry being pumped in.
As the solids build the pumping pressure is increased, forcing more filtrate through the cake and filter
cloth until the desired cake thickness has been achieved. The solids filtration process, together
with the tightly woven filter cloths, ensures exceptionally clear filtrates. |
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Diaphragm Pressing(pre-squeeze)
After the filter cake is formed the diaphragm located at the top of each chamber is automatically inflated,
thus reducing the chamber volume and squeezing the solids to remove more filtrate.
The high pressure maximizes filtration efficiency. By pressing with the diaphragm, the cake is squeeze into
a uniform thickness producing a homogeneous cake, which enhances the subsequent cake washing and air blowing steps. |
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Cake Washing
The dewatered solids in-situ maximize solute recovery and/or solids purity.
The wash liquid is distributed evenly across the filter cake due to the homogeneous cake
surface produced by the squeezing step combined with the horizontal configuration of the filter plate.
All possible wash results. Multiple wash steps and liquids are possible depending in the process and desire result. |
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Diaphragm Pressing (post-squeeze)
After addition of the wash liquid the diaphragm is re-inflated, forcing the wash liquid uniformly
through the filter cake. This produces a washing efficiency of over 95% while producing consistent
dry solids quality and ensuring the use of the minimum possible wash volume.
The wash and pressing steps can be repeated as needed. |
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Air Blowing
Compressed air is blown through the filter cake for final dewatering of the cake.
This ensures a discharged cake of consistent moisture at the lowest possible level exiting the filter,
as it can be controlled precisely by adjusting the pressure and duration. |
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Cake Discharge and Cloth Washing
Finally the filter cakes are discharged from the filter by opening the filter plate pack followed
by advancing the filter cloth. This conveys the cakes from the filter chambers.
Cake discharge is always form two sides of the filter.
Discharge knives on the roller at the end of chamber ensure residue-free discharge.
During the cake discharge cycle the filter cloth is continuously washed on both sides
with high-pressure wash liquid to minimize cloth blinding and ensure consistent filtration results
and a longer cloth life. |
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Filtration
Filtration
