A mill operating on fluid energy comprising a curved grinding chamber having feeding and discharge ends; a plurality of nozzles provided for, and opening into, said grinding chamber at its outer curved periphery; a source of compressed air for supplying said air, through said nozzles, to said grinding chamber; means for regulating the supply and pressure of said air; a feed injector for injecting the material to be ground into the grinding chamber with the aid of compressed air from said source, the arrangement being such that the coarser particles of said material are constrained to move towards the nozzles, get accelerated by the jets of air issuing therefrom and collide with the particles of said material moving with the main stream in said grinding chamber, to result in size reduction; an uptake pipe provided at the discharge end of said grinding chamber for enabling the particles of said material, leaving the grinding chamber, to travel upwards through said pipe; a curved classification chamber for receiving the particles from said uptake pipe and causing the particles of greater size to move near the outer curved periphery of said chamber: a cyclone separator communicating with the said classification chamber for receiving particles of lesser size from said chamber; and a down-take pipe provided at the feeding end of said grinding chamber for enabling the said particles of greater size from said classification chamber to return to said grinding chamber and join fresh material from the said feed injector, to repeat the cycle.
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