Flocculation and Dewatering of Mature Fine Tailings Using Temperature-Responsive Cationic Polymers

Langmuir : the ACS Journal of Surfaces and Colloids
Dan ZhangRavin Narain

Abstract

Temperature-responsive copolymer with cationic charge was prepared with N-isopropylacrylamide (NIPAm) and 2-aminoethyl methacrylamide hydrochloride (AEMA) by conventional free-radical polymerization. The flocculation performance of the copolymer, poly(AEMA-st-NIPAm), was compared to five different mixture ratios of polyNIPAm and cationic poly(acrylamide-st-diallyldimethylammonium chloride) (poly(AAm-st-DADMAC)). The effects of polymer mixture ratios, polymer dosages, and temperature on solid-liquid separation as a function of initial settling rates (ISR), supernatant turbidity, sediment solid content, and water recovery were investigated. Poly(NIPAm) can facilitate particles aggregation by bridging and hydrogen bonding under lower critical solution temperature (LCST); whereas, at temperature above LCST, the adsorption of poly(NIPAm) chains on particles can be enhanced by hydrophobic interaction. A two-step (25 °C → 50 °C → 25 °C) consolidation can further enhance the sediment solid content by polyNIPAm. While the neutral property of polyNIPAm resulted in high turbidity of supernatant, mixing with poly(AAm-st-DADMAC) increases the clarity of supernatant by neutralization of fine particles. The copolymer poly(AEMA-st-NIPAm) funct...Continue Reading

References

Sep 29, 2004·Journal of Colloid and Interface Science·Shuji Sakohara, Kazuo Nishikawa
Jul 19, 2005·Journal of Colloid and Interface Science·George V Franks
Jun 22, 2006·Journal of the American Chemical Society·Zhifeng JiaDeyue Yan
Apr 8, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Feng Zhang, Chang-Chun Wang
Nov 3, 2010·Journal of Colloid and Interface Science·Elizaveta BurdukovaGeorge V Franks
May 14, 2011·Journal of Colloid and Interface Science·John-Paul O'SheaGeorge V Franks
Nov 11, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·John-Paul O'SheaGeorge V Franks
Feb 13, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Lana AlaghaJacob Masliyah
Feb 19, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Yinan WangRavin Narain

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Citations

Nov 13, 2018·Macromolecular Rapid Communications·Sarang P GumfekarJoão B P Soares
Jul 11, 2018·Chemosphere·Sarang P Gumfekar, João B P Soares
Jul 27, 2021·Journal of Applied Polymer Science·E Molly FrazarJ Zach Hilt
Oct 24, 2020·Environmental Science & Technology·Bowei Zheng, Scott D Taylor
May 7, 2019·Environmental Science & Technology·Jason NgZhenghe Xu

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