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Permanent link (DOI): https://doi.org/10.7939/R3JH3D853

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Hydrothermal Treatment of Low Rank Coal for Making High Solid Loading and Stable Coal Water Slurries Open Access

Descriptions

Other title
Subject/Keyword
Lignite
coal water slurry
Rheology
Low rank coal
Hydrothermal treatment
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Li,Qiang
Supervisor and department
Liu, Qingxia (Chemical and Materials Engineering)
Examining committee member and department
Liu, Qingxia (Chemical and Materials Engineering)
Gupta, Rajender (Chemical and Materials Engineering)
Zeng, Hongbo (Chemical and Materials Engineering)
Zhang, Hao (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Chemical Engineering
Date accepted
2014-08-14T13:20:31Z
Graduation date
2014-11
Degree
Master of Science
Degree level
Master's
Abstract
The objective of this research is to understand the effect of hydrothermal dewatering (HTD) on surface properties, stability and rheological behavior of lignite water slurry (LWS). The surface forces between coal particles are found to be attractive after HTD, which is proven by contact angle and zeta potential measurement, FTIR characterizations, and modeling using extended DLVO theory. The attractive particle network could be formed in highly concentrated slurry to increase LWS stability after HTD as shown by stability measurements. The rheological studies show that HTD treated LWS exhibits lower shear viscosity at 100 s-1 than raw LWS at the same mass fraction, which is probably attributed to the decrease of effective volume of HTD coal particle caused by the permanent reduction of both bound and non-freezable water in lignite. The maximum lignite concentration can reach 62 wt % by HTD at 300 °C and adding 1.0 w t% db (dry base) of polycarboxylate ether (PCE).
Language
English
DOI
doi:10.7939/R3JH3D853
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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