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Screening machines and equipment:
Quality made in Germany.

Air Classifier | RHEWUM AWR

The AWR makes it possible to grade your bulk solids efficiently.

At outputs of up to 30 t/h the air classifier provides flexibility for a wide range of feed material such as cement, fly ash, raw mix, gypsum, quartz, coal, cellulose, pigments and colorants, silica, sodium bicarbonate, varnish, zirconium oxide, potato starch, flour, calcium carbonate, graphite, bentonite, china clay, talcum, refractories, rare earths, wax, PVC, toner and many more.

The air classifier handles a high specific feed rate and has low energy consumption. It provides a precise separation and high wear resistance because it was developed for the separation of quartzite. The low maintenance design ensures long term, trouble free performance.

Function of the air classifier

The material is fed pneumatically from the bottom of the air classifier. Material is dispersed by the fast-rotating wheel. The velocity of the rotor sends the product to the outside wall, where agglomerates are disintegrated, and the dispersed material falls down.

The falling material is blown through by an air stream. Due to the physical relation between centrifugal force, gravity and flow force, the lightweight particles are transported into the rotor. Heavier, larger particles are not transported by the air stream and fall down into the cone for coarse material.

Design and plant layout

RHEWUM air classifiers feature a smooth start due to their frequency converter. Additionally, custom made protective wear linings ensure the long-life cycle of the air classifier.

The implementation of an air classifier in to an existing screening unit, means the capacity can be increased significantly because fine material is separated before the screening process. The installation of such a compact air classifier can be an addition to every screening unit. Such plants can be differentiated into units with cyclones and units with filters.

Standard procedure for the removal of fine particles from an air stream is the use of a cyclone with a fan. The fines are separated from the sifting air in the cyclone by means of centrifugal force. The dedusted air is fed back to the air classifier to provide a closed circuit. The residual content of dust in the clean air is at a maximum of 5%. This standard design requires low maintenance.

Alternatively, the air classifier can be operated with a filter, e.g. if the product has to be cooled in the same step. The addition of a filter ensures that nearly 100% of the fines are separated. The clean air of the filter meets every standard for limit values of emissions and can be emitted to the atmosphere if required. Furthermore, it is possible to modulate the temperature of the fines by the addition of fresh air.