1.WF series free classified for powder project 2.small footprint 3.simple structure 4.high grading ... efficiency 1.Operating principle WF series free classified for powder project is the whirlpool superfine classifier with the secondary air inlet ... Chemical industry, Mineral, Building materials, Electronic, Pharmacy, Pesticide, Paint, Dye, Food, Metallurgy, Feed and so on, it can be dry classification ...