LEACHING OF MINERALS IN SUBBITUMINOUS INDIAN COAL
AND CHARACTERISATION OF THE PRODUCTS BY SEM
B. MANOJ AND A.G. KUNJOMANA
Abstract
Coal is chemically and physically a complex and heterogeneous material, consisting of organic and
inorganic mineral constituents. Presence of minerals in excess will pollute water, air and soil. Concerted
efforts are needed to reduce ash forming inorganic elements and to develop clean methods of using coal.
This paper reports the demineralization of sub bituminous coal with EDTA, HCl, HF, chloroform and acid
mixture. The residual coal from each treatment was analyzed using Scanning Electron Microscopy (SEM)
and Ultimate analysis. All the micrographs were bright field and revealed several features corresponding to
the mineral grains. It comprised of lithophiles like aluminium, silicates and calcium. The absences of some
morphological features correspond to inorganic elements in residual coal samples confirming
demineralization. This result was further confirmed with the CHNS analysis. It was evident from the results
that amongst the leachants used, Hydrofluoric acid and acid mixture had significant effect in removing the
mineral matter, sulphur and oxygenated functional groups.
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