LAPSE:2020.1010
Published Article
LAPSE:2020.1010
Evaluation of a Novel Polymeric Flocculant for Enhanced Water Recovery of Mature Fine Tailings
Kyle C. Lister, Heather Kaminsky, Robin A. Hutchinson
September 23, 2020
The novel cationic flocculant, poly(lactic acid) choline iodide ester methacrylate (poly(PLA4ChMA)), has been shown to provide improved flocculation of 5.0 wt.% mature fine tailings (MFT) diluted in deionized water compared to commercial anionic polymers, with continued dewatering of the sediment occurring as the polymer undergoes partial hydrolytic degradation. However, the elevated dosages (10,000 ppm) required would make the polymer costly to implement on an industrial scale. With this motivation, the impact of MFT loading and the use of process water is explored while comparing the settling performance of poly(PLA4ChMA) to available commercial alternatives such as anionic FLOPAM A3338. Improved consolidation of 5.0 wt.% MFT diluted with process water could be achieved at reduced dosages (500 ppm) with poly(PLA4ChMA). However, the final compaction levels after polymer degradation were similar to those achieved with the nondegradable commercial flocculants. Flocculation-filtration experiments with undiluted MFT are also conducted to compare the performance of the polymers. Significantly faster rates of water release were observed with the cationic flocculants compared to FLOPAM A3338, but no improvement in the overall tailings compaction was found either before or after poly(PLA4ChMA) degradation. Thus, the improved dewatering observed with poly(PLA4ChMA) in dilute MFT suspensions does not extend to conditions that would be encountered in the field.
Keywords
cationic polymers, flocculation, flocculation-filtration, hydrolytic degradation, mature fine tailings
Subject
Suggested Citation
Lister KC, Kaminsky H, Hutchinson RA. Evaluation of a Novel Polymeric Flocculant for Enhanced Water Recovery of Mature Fine Tailings. (2020). LAPSE:2020.1010
Author Affiliations
Lister KC: Department of Chemical Engineering, Queen’s University, 19 Division St, Kingston, ON K7L 3N6, Canada
Kaminsky H: Applied Research Centre for Oil Sands Sustainability, Northern Alberta Institute of Technology, 9413 20 Ave NW, Edmonton, AB T6N 1E5, Canada
Hutchinson RA: Department of Chemical Engineering, Queen’s University, 19 Division St, Kingston, ON K7L 3N6, Canada [ORCID]
Journal Name
Processes
Volume
8
Issue
6
Article Number
E735
Year
2020
Publication Date
2020-06-24
Published Version
ISSN
2227-9717
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Original Submission
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PII: pr8060735, Publication Type: Journal Article
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LAPSE:2020.1010
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doi:10.3390/pr8060735
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Sep 23, 2020
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CC BY 4.0
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Sep 23, 2020
 
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Sep 23, 2020
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Original Submitter
Calvin Tsay
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