管内うず巻気流による微粉砕の研究 : 第1報装置とその粉砕特性について

概要

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Studying the grinding characteristics of the bituminous coal (Bibai-coal, 20M) by a newly designed voltex pulperizer (closed circuit type, dia. 58.6,height 177), we found that the size distribution of the ground product holds for the exponential law of Rosin and Rammler (R=100e^<-bxn>), concerning the particle size distribution, as that of grinding by a ball mill, and the value of exponent of n is nearly 0.44,while the value ground by a ball mill is about 1.0. Further, the value of b was nearly proportional to the applied energy and was inversely proportional to about 0.7 power of charging rate of grinding particles, so far as we experiment up to theoritical energy of air jet 70kg・m/s and discharge of air 8×10^<-2>kg/s. Then, the grinding characteristics was pretty obvious, from which we have been able to derive the design of the apparatus and its operations.