Effect of Deashing Treatment on the Coal Structure and Surface Groups

Abstract:

One Datong (China) coal was deashed by a mixture of hydrofluoric acid (HF), hydrochloric acid (HCl) and distilled water. The textures of the coal samples were investigated by N₂ adsorption at 77 K. The surface groups on coals were characterized by X-ray photoelectron spectroscopy (XPS). The results showed that the coal texture has been changed after deashing treatment. The XPS results showed that the dominant forms of carbon on the surface of raw coal are C-C and C-H, the dominant forms of oxygen are COO-and C-O, and dominant forms of sulphur is thiophenes sulphur. The de-ashing treatments resulted in the elimination of sulphur and a decrease of oxygen adsorbed on the coal surface.

• Periodical: Advanced Materials Research (Volume 803)
• Pages: 330-333
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.803.330
• Online since: September 2013
• Authors: Shi Xiong Hao, Xing Yong Liu, Zu Xiao Yu
• Keywords: CoAl, Deashing Treatment, Texture, X-Ray Photoelectron Spectroscopy

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