A gas-jet mill comprises a hopper with loading nozzles, a classifier with return nozzles, a grinding chamber and energy carrier high-pressure chambers mounted opposite each other with nozzles and central bodies. In the neck (minimum cross-section) of hopper casing a control device is mounted, whose operating part is formed as a central body of ogival shape ("ogive") and connected to a drive by a rod, which controls the position of "ogive" and allows longitudinal movement along the axis of hopper with change of the area of annular gap between the "ogive" and loading nozzles.
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