Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

The classification of feldspar powders was carried out with multi channel zig zag air classifier and the formula of classified particle cut size and the efficiency of classification was abtained. It was possible for multi channel zig zag classifier to classify almost all particles below 10 mm by controlling wheel velocity. Classification efficiency of zig zag was better than one of multiflex centrifugal classifier. The formula of classified particles cut size in air flow of uniform speed field was deduced and area equivalent shape factor was considered instead of dynamic shape factor as a shape factor which influenced size determination. Experimental cut size data agreed with cut size affected by area equivalent shape factor which is aspect ratio rather than cut size of particles whose shape is sphere. This result showed that dynamic shape factor was simplified area equivalent shape factor, so dynamic shape factor may be able to be replaced by 2 dimensional area equivalent shape factor.