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The Pannevis RT horizontal vacuum belt filter from Larox is a unique design that offers true multi-step processing on one unit. This one unit provides discrete multi-step processing of a wide range of products, including multiple washing steps, vibration, hot air drying and mechanical compression.

The heart of the Pannevis RT filter is a continuously moving filter cloth that does not require a rubber support belt. Instead an open grid located in a profiled tray running the length of the filter supports the filter cloth. The vacuum for separation of the solids and liquid is applied to the underside of the cloth. When vacuum is applied, the forward movement of the cloth pulls the tray with it at the same speed as the cloth. When the tray has advanced to a specified point, the vacuum is briefly removed from the underside of the tray, while, at the same time, the tray is retracted to its original position. Vacuum is then reapplied and the tray again begins to advance with the cloth.

The RT filter can be used for multiple wash steps, either co-current or counter-current, vibration, hot air drying, cooling, steaming or mechanical compression, any or all such steps in almost any combination.

They can also be offered with fume-tight, gas-tight or pressure-tight enclosures, allowing safe operation of processes involving flammable materials, explosives, hazardous materials, or any process where containment is a critical factor.

The ability to carry out multiple wash steps, with each wash filtrate precisely collected into its own receiver enables the Pannevis RT filter to produce very high purity products with low wash water consumption. Washing can be done with more than one liquid and can be either co-current or counter-current. Very high purity cakes, up to 99.99% or better, can be produced.

The RT filter is also a very efficient dryer after the dewatering process is completed. Filter cakes are relatively thin, usually between 6 and 100 mm (1/4" - 4"), so drying is achieved quickly with final moisture contents down to 0.1% possible. Rapid drying also allows a higher gas temperature to be used, since the cake will normally not reach the gas temperature except at the end of the cycle.

For solvent wetted materials, a gas-tight enclosure with full nitrogen blanketing is used. Equally, steaming or cooling of the filter cake can be accomplished using the drying procedure by substituting steam or a coolant for the hot air.

Several mechanical compression options are available with the Pannevis RT filter.

- The simplest is the Vacuum Seal Belt, in which the vacuum applied under the cake is also utilized to pull a sealing belt onto the cake surface, thus compressing the cake.

- For higher solids, the Vacuum Press Belt applies mechanical force to the cake surface while vacuum continues to be applied below the cake.

- For even higher solids content, the Press Belt uses a mechanical system of press rollers mounted at the end of the filter, after the vacuum sections.