This invention relates to means for pulverizing coal or other minerals by causing them toimpact against rotating elements which are specially contoured to maximize two objectives: 1)improved efficiency in pulverization of the material particles at high production rates; and 2)protection of the rotating elements themselves from wear by contact with the process material. Thedevice is formed with counter-rotating rotors which are inverted with respect to each other. Therotors have specially contoured elements attached to their inner faces in concentric rings. Theelements could be any one of four different embodiments or a combination of two or more differentelements forming successive rings.
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