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RHEWUM GmbH | 42875 Remscheid | Tel. +49 (0) 2191 - 5767 - 0 | info@rhewum.de
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Other Special Equipment » Air Classifier RHEWUM AWR
Classifer in testfield
Due to its modular design the sifter with its vast sharp separation can be applied for many tasks. This high efficiency sifter is the result of long year experience and development.
At a product output of up to 30 t/h the sifter provides a high flexibiity regarding feed matrial, e.g. cement, fly ash, raw mix, gypsum, quartz, coal, cellulose, pigments and colourants, 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 sifter features a high specific feed rate as well as a low energy consumption. At the same time it provides a sharp separation at separation cuts below 0. mm, a high wear resistance because it was development for the separation of quartzite, a high economic efficiency and due to its design simple maintenance. This ensures a trouble free long term plant availability.
Function of the Sifter
The material is fed pneumatically from the bottom in the sifting area. By this the dispersion of the material at the fast rotating sifting wheel is guaranteed. The material is dashed to the border area by the velocity of the rotor and rebounds against the side wall of the sifting area. Still existing agglomerates are disintegrated at this stage of the sifting process and the dispersed material falls down.
The falling material is tangentially flown through by an air stream. Due to the physical relation between centrifugal force, gravity force and flow force the lightweight particles are transported into the rotor. Heavy and large particles are not transported by the air stream and fall down into the cone for coarse material.
Design and Plant Layout
RHEWUM Air Sifter are characterised by a smooth start guaranteed by use of a frequency converter. Moreover tailor made wear protecting linings ensure the long-life cycle of the sifter.
By implementing a sifter in an existing screening plant the capacity can be increased significantly because fine material is separated before the screening process and therefore the screening machines are discharged. The installation of such a compact sifter can be realised in every screening plant. Such plants can be differentiated into plants with cyclones and plants with filters.
Standard for the removal of fines 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 sifter as working fluid in a closed circuit. The residual content of dust in the clean gas adds up to max. 5%. This standard design of a circuit needs an outstanding low maintenance effort.
Alternatively the sifter can be operated with a filter, e.g. if the product has to be cooled in the same step. By use of a filter nearly 100% of the fines are separated. The clean gas of the filter fulfils every standard for limit values of emissions and can be emitted to the atmosphere if required. Furthermore it is possible to adjust the temperature of the fines by the addition of fresh air.
Processing of quartz
With a content of 12% in the earth crust quartz is the second most common mineral. It is mined from massive
rock or from sand. In particle sizes below 0.5 mm quartz is used in glass production, for special colours for road construction, for foundry sand, as adhesive in ceramics industry as well as for blasting plants. If the sand is milled down below 80 µm at a d50 of approx. 20 µm it can b used for ceramic glazes. To ensure a quartz product free of iron parts in contact with the quartz have to be manufactured from aluminium oxide or have to be lined accordingly.Processing of Feldspar
Feldspars are the most common minerals in the earth crust. It is indispensable for the production of glass since only feldspar contains the required types of alkali as well as aluminium. Furthermore it is used for the production of glazes, enamel, abrasives and welding electrodes. Potash feldspar is the raw material for the hard porcelain industry. Due to its high electric strength hard porcelain is used for isolators, ignition plugs etc. For tiles, brick and glazes a particle size distribution of 97% below 45 µm is sufficient. For isolators and technical ceramics particle sizes of 90% below 125 µm are required. These raw materials have to be free absolutely free of iron; adequate linings at the rotor of the sifter and the housing have to be foreseen.