Effect of Acid Treatment on Volumetric Swelling Ratios of Coals

Authors : Nejat MESCİ

Pages : 397-404

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :To remove Ca2+ ions, six low rank coals and one coking coal were treated with 0.1 and l.0 N HC1 for 24 h. IR spectra and proximate analysis of the lignites indicated that only slight structural changes had occurred during acid treatment. The swelling ratios of parent and acid-treated coal samples showed that removal of Ca2+ resulted in an increase in the swelling ratios. Higher swelling ratios were obtained with acid-washed coal samples. While the highest swelling ratios of the parent lignites were obtained in ethylenediamine, those of acid-treated samples were obtained in pyridine and dimethylformamide.
Keywords : Turk J Chem, 25, 2001, 397 404 Turk J Chem, vol 25, iss 4