28. Study on pulverization of coals in organic solvents

Abstract

Pulverizing behavior of coals in organic solvents has been studied by use of a homogenizer. The pulverized particles exhibited a particle size distribution consisting of coarse and fine particle fractions devided at around 70μm. Coal was pulverized easily in solvents such as toluene and hexane which hardly swelled the coal. The coal kept in air for a long time was hard to pulverize compared to the coal preserved in water. The fine particle fraction gave a higher conversion to solvent solubles by liquefaction with tetralin than the coarse particle fraction.