Abstract
Respirable coal mine dust samples from three different U.S. mines were aerodynamically classified in a Bahco centrifugal classifier to yield four particle size fractions. Fractions were analyzed for density, particle size by optical microscopy, random and oriented projected area, and specific surface area (BET). These measures enabled us to define additional characterizing parameters which yielded insight into the physical nature of the size fractions. Differences in parameters for size fractions obtained form the same sample and from samples collected in different mines are discussed. It is suggested that to understand the differences in reported incidences of coal workers' pneumoconiosis in different mines, analyses of this type, together with the dust chemical composition as a function of particle size within the respirable size range, will be necessary.
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