What are Air Classifiers and how do they work?
Air Classifiers are industrial machines which are used to separate materials by size, shape, and density.
By using forces – such as air drag, gravity and centrifugal force – they sort fine particles from coarse particles and lighter particles from heavier ones. While density does play a role, the air classifier separation process is mainly dependant on the mass and weight of the particles.
So how do they work? When a feed of material enters the Air Classifier’s chamber, they encounter a column of rising air. The air drag then creates an upward force, counteracting with gravity, to lift the materials into the air. This allows the objects with varying physical characteristics in the air column to be sorted and moved into different regions, with the heavier particles naturally falling to the bottom of the chamber.
An Air Classifier is commonly used on an industrial scale when particles are too fine to be screened or the capacity is too large. An example of this is a recycling center where various types of plastics, paper and metal have to be divided in order to be processed. They are also used to sort materials such as chemicals, foods, minerals, cement, fly ash, gypsum, quartz, silica, sodium bicarbonate, varnish and bentonite.
Ait Classifiers can also be combined with impact grinding equipment to create an Air Classifier Mill. The mill uses airflow to convey feed material to the mill’s grinding chamber, segregate the material into fine and coarse fractions, recirculates the coarse material for further grinding and moves the fine particles out of the mill.Simply put, the intelligently engineered Air Classifier acts as a mini segregation factory.