Principle of Operation and Performance of an Air Impact Mill.

With this mill, relatively recently introduced into Europe, it is possible to achieve considerable advantages especially in the fine and superfine milling of hard and abrasive or thermo-sensitive materials. By means of an integrated air classifier it is possible to cover with one mill a range of specifications from 150 mu m with, if necessary, simultaneous drying and homogenizing of the material. Industrial applications include the milling of zircon sand, petroleum coke and materials in the food industry. For example, a crossflow moving bed adsorber for SO//2-removal by activated coke (flow rate 150,000 m**3/h (STP) of flue gases from a coal fired power plant) successfully used. For this application effective adsorption- and reaction rates were determined in laboratory scale fixed bed adsorbers. It is demonstrated physical and chemical phenomena is suitable for dimensioning cross-flow moving bed adsorbers. This is shown by comparison of measured and calculated exist concentrations.