Abstract: A powder processing apparatus includes a rotor 5, multiple impact pins, and a collision ring 8. The rotor rotates around a horizontal shaft. The impact pins are radially attached on a front surface of the rotor 5. The collision ring 8 covers a side surface of the rotor 5 in which the impact pins are attached and is peripherally disposed along an outermost raceway surface of the impact pins. A part of members (a detachable portion 6b) included in the impact pin is detachably attached to the other (a fixing portion 6a). Multiple types of the detachable parts are prepared to adjust a distance between the impact pins and the collision ring 8.