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Plate Press

A development of the plate-and-frame filter press in which the filtration cavity is created by two adjacent corrugated, recessed plates.  In both cases, the plates are covered with filter cloth and the slurry is pumped into the cavity under very high pressure.  Water passes through the cloth and the cavity fills with the suspended solids, the filter cake.  The cake is discharged by separating the plates.

Glossary image: 
Plate press

Pan Mixer

A mixer comprising a horizontal circular pan and a blade.  Either the pan or the blade may rotate to create the mixing action and the mixture is discharged through doors in the base of the pan.  Commonly used to mix ready-mixed concrete.

Glossary image: 
Pan mixer

Pozzolana, Pozzolanic

Originally a volcanic earth from Pozzuoli (Italy), rich in alumina, silica and iron, which, when added to lime mortar, reacted to produce an hydraulic set. Now applied to other materials such as crushed brick or pulverised fuel ash.



Prescreeners (also known as grizzly screens) are large strong screens often located at the start of a screening or crushing operation. They can be used in two ways, to protect the machinery, such as crushers or conveyors being presented with oversized materials, and/or to remove undersized material before crushing.


Picking Station

Picking stations are used when manual sorting of the feedstock is required. Manual sorting may be required when unwanted materials cannot be reliably or efficiently removed by other methods. Picking stations are horizontal conveyor belts configured to allow operatives to remove unwanted items. This configuration includes the consideration of correct ergonomics, efficiency and safety.

Glossary image: 
Picking station