| 摘要 |
PURPOSE: To increase the fine milling and treatment quantity of products by cooling the coarse particles flowing back from a classifying device within a fluidized-bed counter-jet mill by a cryogenic cooling medium. CONSTITUTION: The fluidized-bed counter-jet mill is provided with a grinding chamber 2 to be loaded by a jet gaseous flow, a device 7 for supplying the grinding stock, the classifying device 5 for classifying the coarse particles 11 and fine particulates 10 and a bottom 3 arranged below the grinding chamber 2 for the fed grinding stock and the coarse particles 11 flowing back from the classifying device 5. The coarse particles 11 flowing back from the classifying device 5 are cooled by the cryogenic cooling medium supplied from a supplying device 13 within the fluidized-bed counter-jet mill. Consequently, only the slight energy and cooling medium are necessitated and the fine milling and treatment quantity of the products may be increased.
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