Selective air classification and separation system for efficient operation in wide particle size ranges

摘要

Comex has developed an air classification system for processing materials in a very wide particle size range. The system consists of high efficiency dynamic air classifiers working with a static classifier as an integral part of the system. In addition, the dynamic classification system contains multiple processing stages allowing selective classification into several size fractions, during only one material pass. This allows efficient selection of multiple size classes and simultaneously, separation of materials having different density and shape. The separated fractions, and their combinations, can be used for closed circuit milling operation or can represent a specific product. The system can provide efficient classification in wide size range from ultrafine sizes at 1-2 urn and up to several mm particles. The paper describes results from laboratory and industrial applications, to produce different size classes, to upgrade fine ground Fe ore, and to eliminate some particles representing Pb fine powder contaminants.