Fluidized bed opposed jet mill
The fluidized bed opposed jet mill is, next to the spiral jet mill, the most frequently used type of jet mill . With this type of mill, using compressed air, it is possible to achieve finenesses in the range from 1 to 100 micrometers . The grinding is completely autogenous , so that there is practically no wear and tear on the grinding tools.
functionality
The ground material is fed into the mill housing via a feed lock. A fluidized product bed is formed in the grinding chamber, which is fluidized by the gas jets emerging from the grinding air nozzles . From this fluidized bed, regrind particles enter the gas jets, where they are accelerated to high speeds. The accelerated grist particles meet along the gas jets and in the center of the grinding chamber and are comminuted in the process. The relaxed grinding gas laden with good particles rises in the center of the apparatus to the classifier wheel , which is driven by the variable-speed motor via a belt drive. Too coarse particles are rejected by the classifier wheel and go straight back to the fluidized bed; fine particles leave the mill together with the grinding gas and are separated from the grinding gas in a suitable separator or dust filter.
application
Due to the special mode of action, the fluidized bed jet mill is also used for fine grinding the hardest products, such as B. minerals , ceramics or glass are used. Since the product is not heated by the grinding process using cooled compressed air, it is also used for the fine grinding of extremely temperature-sensitive materials such as e.g. B. wax or toner powder used.
Web links
References
- Netzsch-Condux Mahltechnik, Hanau