Abstract
The environmental concern associated with mining and burning of coal has long been discussed in the literature. The present study deals with the four different ranks of coal with varying calorific values (CV) aiming to determine if these values are influenced by the sulfur content and/or the forms of iron-sulfur minerals associated with these types of coal. It has been established that Mossbauer spectroscopy is undoubtedly the best analytical tool for discerning iron minerals. The four different types of coal had CVs ranging from 32,403 to 16,000 kJ/kg and sulfur concentrations ranging from 0.25 to 2.5%. There was no direct correlation between the CV and the percentage of pyrites and ferrous sulphate. However, in general, as the CV increases, the percentage of sulfur increases.
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