THE DISTRIBUTION OF INORGANIC ELEMENTS BETWEEN COAL AND MINERAL MATTER IN ROMANIAN LIGNITE

Correlations resulting from ash level determinations and X-ray fluorescence data performed on lignite ash samples taken from the Campulung coal field, Rumania, were determined. The existence of linear relationships between the concentrations of each analysed element: Si, Al, Ca, Fe, S, Mg, Na and K (converted to oxides), and the ash content (dry basis) for different ash levels has been ascertained, with standard deviations, s(0), in the range 4-19%, with respect to the mean concentration of the oxide in the coal. The data can be used, following suitable extrapolation, to estimate the oxide fractions which correspond to the parts of a given element bound to the coal's organic and inorganic matter.