Abstract
The effect of HCl, HNO 3 and H 2SO 4 at different concentrations on demineralization of high sulphur coal from Boragolai and Ledo colliery of Makum Coalfield, Assam, India was investigated at ambient and 95 °C. The acids, depending on type and concentration, can reduce the mineral matter in the range of 22.6–32.0% at ambient temperature and 24.8–40.1% at 95 °C from Boragolai coal. The acids at 10% concentration level can remove 7.6–22.6% and 13.6–38.6% sulphur from Boragolai coal at ambient and 95 °C, respectively. HNO 3 leads to maximum and H 2SO 4 minimum desulphurization of the coal samples. The low desulphurization ability of H 2SO 4 is attributed to high viscosity of the acid at ambient temperature and sulphonation of the coal samples. The demineralization and desulphurization of Ledo coal with the acids are relatively low and is attributed to its higher hydrophobicity.
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