JET GRINDING APPARATUS AND METHOD

摘要

PROBLEM TO BE SOLVED: To certainly obtain a desired particle size distribution when a material to be ground is ground in a grinding chamber to be classified by a rotor classifier. SOLUTION: A gas jet nozzle for ejecting high pressure gas, a raw material supply nozzle for supplying a material to be ground, a grinding chamber 2 for grinding the material to be ground supplied from the raw material supply nozzle by the high pressure gas ejected from the gas jet nozzle, a guide passage 5 for taking out the ground powder from the grinding chamber 2 along with jet streams generated by the high pressure gas and a rotor classifier for classifying the ground powder guided to the outer peripheral surface of a rotor by the jet streams from the guide passage are provided. By providing the guide passage, the revolving speed of the ground powder can be made slower than that in the grinding chamber and the rotational speed of the rotor classifier can be set so as to become faster than the revolving speed of the gound powder.