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Role of Carbon Dioxide in Densification of Oil Sands Tailings Open Access


Other title
oil sands tailings
carbon dioxide
Type of item
Degree grantor
University of Alberta
Author or creator
Zhu, Ren
Supervisor and department
Xu, Zhenghe (Chemical and Materials Engineering)
Liu, Qingxia (Chemical and Materials Engineering)
Examining committee member and department
Liu, Qingxia (Chemical and Materials Engineering)
Xu, Zhenghe (Chemical and Materials Engineering)
Liu, Yang (Civil and Environmental Engineering)
Department of Chemical and Materials Engineering

Date accepted
Graduation date
Master of Science
Degree level
Carbon dioxide (CO2) was shown as a promising alternative for oil sands tailings treatment with economical and environmental benefits. This thesis aims to understand the role of CO2 addition in settling and densification of oil sands tailings. In this study, CO2 was pressurized into two industrial whole tailings. The optimal initial settling rate, supernatant clarity and solids content of sediment were achieved at CO2 partial pressure of about 100 kPa. Increasing the processing temperature improved the effects of CO2 on the settling of tailings. The improvement on settling and densification of tailings by CO2 was mainly attributed to pH reduction, which led to a decrease in the value of zeta potential of the fines. On the other hand, CO2 bubbles formed by dissolved gas under super-saturation pressure caused a less clear supernatant by disturbing the formed sediments. The limit of CO2 sequestration by oil sands tailings was experimentally evaluated.
License granted by Ren Zhu ( on 2011-09-26T18:38:03Z (GMT): 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 the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein 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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