Side Draft Classifier & Side Draft Separator
The rejector is equipped with a variable speed motor and drive (frequency inverter as standard) which allows the operator to simply "dial-in" fineness changes from the central control room The separation air, laden with the fine product, is discharged through one, two or multiple air outlets to the outside of the separator while the coarse product falls to the lower part of the classifier and is discharged. Although wear is very limited in this new type of separator, all parts submitted to abrasion are lined, as standard, with abrasion resistant materials as Ni-hard, Basalt and A-R steel.
As air displaces particles horizontally rather than lifting them, less energy is required than for other classifiers.
N.N.Zoubov Engineers, pioneers in air classification technology since the 1946's, sets new standards with the 3rd generation Side Draft (SD) High Efficiency Classifier. The SD combines ultra-sharp cuts with low energy consumption and low abrasion in a compact, simply operated unit.
This new concept of separation provides a narrower particle size distribution of the product with less ultra fine particles and less residues. For cement applications this will result in higher compression strengths obtained at lower specific surface areas (cm²/g Blaine).
A lower specific energy consumption of the whole closed circuit grinding installation is realised by increased fines recovery compared to conventional air separators. Depending upon the fineness of the feed to the Classifier and the product fineness, the "bypass" of unclassified particles to the tailings is maintained under 10 %. As a result of this, increases of production of 20 % to 30 % over the conventional separators have been proven in the field and with lower circulating loads.
Apart from the remote control of the rotational speed of the rejector, the following adjustments can be made, independently, to achieve the optimum operating conditions of the classifier:
- Adjustments of the volumetric air flow rate.
- Adjustments of the feed rate (by F + T Control).
- Adjustments of the linear air velocity within the separator (patent pending).
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