The Comex air classifier has been developed at the SINTEF/NTNU laboratory in Norway. The feed material enters the classifier mixed with an air stream through a vertical pipe positioned at the bottom of the classifier. The particle stream entering the classifier is dispersed around a static distribution cone, where coarse particles immediately begin to settle in the lower velocity air stream. These particles are rejected through the conical outlet and fall down to the bottom part of the classifier. As they are falling to the bottom part of the classifier, they pass through an area where secondary rinse air is introduced tangentially, in a swirling motion, to wash off fine particles that might be adhering to the coarse material.
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