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Permanent link (DOI): https://doi.org/10.7939/R38K7583Z

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Novel Methods for Treating Oilsands Tailings Open Access

Descriptions

Other title
Subject/Keyword
Alkoxysilanes
Clay
Flocculation
Polymers
Tailings
Oilsands
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Thompson, Dominic K
Supervisor and department
Soares, Joao (Chemical and Materials Engineering)
Examining committee member and department
Choi, Philip (Chemical and Materials Engineering)
Liu, Qi (Chemical and Materials Engineering)
Soares, Joao (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Chemical Engineering
Date accepted
2017-05-12T13:20:52Z
Graduation date
2017-06:Spring 2017
Degree
Master of Science
Degree level
Master's
Abstract
Oilsands tailings are a waste product comprising primarily a stable alkaline suspension of clay in water. This waste product of oilsands mining is environmentally hazardous to store and expensive to safely dispose of. This work presents two novel ideas for dealing with the waste. The first is treatment with alkoxysilanes. Five alkoxysilanes were tested: bis(3-trimethoxysilylpropyl)amine; 3- aminopropyltrimethoxysilane; (3-glycidoxypropyl)trimethoxysilane; methacryloxypropyltrimethoxysilane; and tetramethoxysilane. Of these, bis(3- trimethoxysilylpropyl)amine and 3-aminopropyltrimethoxysilane were found to be effective at reducing Capillary Suction Time. Further tests were conducted with bis(3- trimethoxysilylpropyl)amine, including: 1) optimisation of pretreatment conditions; 2) determination of the effect of carbon dioxide on its performance; 3) determination of its interaction with a conventional polymer flocculant; and 4) investigation of its effect on suspensions with other solids concentrations. The second is treatment with carbon dioxide close to its critical point. This treatment is found to improve measures of dewatering potential, including Capillary Suction Time. No evidence is found for an additional supercritical effect and the mechanism is found to be the well-documented pH reduction.
Language
English
DOI
doi:10.7939/R38K7583Z
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
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