抄録
The effects of organic additives on the finest comminution obtained by using an impact mill were studied. A commercial disintegrator (Jiyu-Mill M3, Nara Machinery) was modified by installing a recycling circuit and improved vanes. The additives used were triethanol amine (TEA), ethylene glycol (EG), acetic acid (AA) and others up to 5%. In a batch operation, the minimum attainable median particle size was significantly reduced, although the power consumption increased. Powders ground with additives were less edgy and showed smaller compressive strength and mold release resistance. The optimum concentration was between 0.5 and 5wt% which is much higher than that for a conventional ball mill. The characteristics of the mechanism of grinding aids were: (1) grinding energy was more efficiently transmitted on the powder particle by preventing the adhesion of the finest particles on the main parts of the grinding system, and (2) there was an increase in the effective solid concentration.
