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Coal is a complex heterogeneous material and for its knowledge a homogeneous fractionation is necessary. Coal presents variations in the same grains depending on density, so a more adequate fractionation is obtained by its separation according to density. The density was determined with a pycnometer and the separation of coal in different fractions according to density. The organic and inorganic solutions were replaced with distilled water.

A NEW METHOD OF COAL SEPARA TION IN GRANULOMETRIC CLASSES AND THE STUDY OF SOME ANAL YTICAL PROPERTIES