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Permanent link (DOI): https://doi.org/10.7939/R3H62B

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Hydrocarbon recovery from waste streams of oil sands processing Open Access

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Other title
Subject/Keyword
flotation column, Al-PAM, Magnafloc-1011, Asphaltene
Hydrocarbon, recovery, MFT, oil sands,flotation, Denver Cell, flocculation
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Thomas, Tenny
Supervisor and department
Xu, Zhenghe (Chemical and Materials Engineering)
Masliyah, Jacob (Chemical and Materials Engineering)
Examining committee member and department
Liu, Qi (Chemical and Materials Engineering)
Xu, Zhenghe (Chemical and Materials Engineering)
Babadagli, Tayfun (Petroleum Engineering)
Masliyah, Jacob (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization

Date accepted
2011-04-13T20:39:56Z
Graduation date
2011-06
Degree
Master of Science
Degree level
Master's
Abstract
Bitumen recovery by the water-based extraction process produces waste streams known as tailings. When discharged into the tailing ponds, the coarse solids in the tailings stream settle out quickly, while the fine solids accumulate over years of settling to a solids content of 30-35% by weight. The formed fluid fine solids sludge, known as mature fine tailings (MFT), traps 1-3% by weight hydrocarbons within its stable slurry structure. The remediation of these mature fine tailings is one of the major challenges facing the oil sands industry. This study was intended to investigate the recovery of residual hydrocarbons in the MFT by froth flotation process. Using a laboratory Denver flotation cell operated in a batch mode, the effect of MFT dilution ratio by process water or tap water, the flotation hydrodynamics and aeration rate on hydrocarbon recovery kinetics was studied. It was found that at 1:2 dilution by weight of the MFT with process water, increasing aeration rate has a more favourable effect on recovering more than 85% of the hydrocarbons from the MFT. The hydrocarbon-rich froth produced was treated by naphtha and was found to produce a hydrocarbon product similar to diluted bitumen obtained in bitumen extraction process, suitable for upgrading. Similar approach was applied to the hydrocarbon-rich tailings from the Tailings Solvent Recovery Unit of paraffinic froth treatment. Satisfactory recovery of hydrocarbons from the MFT was obtained using a flotation column operated in a continuous mode, confirmed the results obtained from the batch tests. The tailings produced from the continuous flotation experiments were treated with polymer flocculants such as Magnafloc-1011 and Al-PAM to study the effect of hydrocarbon recovery on the remediation of the MFT. The results from initial tests showed that both flocculants were not as effective on flocculating MFT solids following the recovery of hydrocarbons by froth flotation.
Language
English
DOI
doi:10.7939/R3H62B
Rights
License granted by Tenny Thomas (tenny@ualberta.ca) on 2011-04-12T19:01:30Z (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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