Feasibility studies of de-sulfurization and de-ashing of low grade medium to high sulfur coals by low energy ultrasonication

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• 作者：Binoy K. Saikiap> ; p>p>bksaikia@gmail.com" class="auth_mailp> ; Arju M. Dutta ; Bimala P. Baruah
• 关键词：Indian coals ; Coal beneficiation ; Ultrasonication of coals ; Clean coal technology
• 刊名：Fuel
• 出版年：1 May, 2014
• 年：2014
• 卷：123
• 期：Complete
• 页码：12-18
• 全文大小：1442 K

文摘

The present paper reports an attempt of using low ultrasonic energy (20 kHz) to clean some low rank medium to high sulfur coal samples from northeast India in the presence of H₂O₂ solutions. The study shows satisfactory removal of all the forms of sulfur and mineral matters (ash) from the coal samples. The physico-chemical characterizations of the raw and ultrasonicated coal samples were carried out by using Fourier Transformation Infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Thermogravimetry-Derivative Thermogravimetry (TG-DTG) techniques to evaluate the final product quality. The quantitative FT-IR spectroscopic analysis demonstrated the formation of oxidized sulfur species (Spt>pt>O and pt>pt>SO₂) and their subsequent removal from the coal samples during ultrasonication. The XRD profiles supported the partial removal of some minerals from the coal including their de-ashing. The TG-DTG profiles of the beneficiated coal revealed their improved quality for use in thermal plants with better combustion efficiency.