Abstract
Coal was subjected to intensive grinding to produce submicrometer particles. This was done in two stages. Ultrafine coal produced by fluid energy mill grinding was further ground in a planetary ball mill or attritor mill. The grinding process was monitored by density gradient separation and surface area measurements. Conditions were established to produce coal in the 0.05-1 μm size range with 3 h of grinding. Several different slurry solvents were examined for grinding efficiency. Extensive accretion of coal particles to produce homogeneous particles was found to be a major problem. In several instances there appeared to be a low melting phase produced (∼65 °C) which cemented the fine particles together during vacuum drying
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