期刊
ACS APPLIED NANO MATERIALS
卷 5, 期 6, 页码 7679-7695出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.1c04566
关键词
mature fine tailings; polymer grafting; nanoparticles; settling; consolidation; nanoflocculant; polyacrylamide; sodium lauryl sulfate
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN-2015-05222]
- Department of Chemical and Petroleum Engineering at the Schulich School of Engineering at the University of Calgary
A three-in-one nanoflocculent was developed to enhance settling and dewatering of oil sands tailings, which showed improved performance compared to traditional anionic PAM.
In this study, a three-in-one nanoflocculent that consists of nanoparticles of titanomagnetite (NTM) grafted with multiple segments of hydrophobically modified chains of polyacrylamide (PAM) with sodium laurel sulfate (SLS) was developed for enhanced settling and dewatering of oil sands mature line tailings (MFT). The existence of NTM allowed more than one segment to graft/functionalize (i.e., hydrophobic and hydrophilic) on the same surface. This three-in-one nanoflocculent not only provides better exposure for the functionalized species, but it also increases the nanoflocculant specific gravity and dispersibility for better interactions. The NTM was initially synthesized by the coprecipitation method and subsequently grafted with PAM and SLS at room conditions. The flocculation and dewatering performance of the as-synthesized nanoflocculants was evaluated using the initial settling rate (ISR), supernatant turbidity, sludge volume index, capillary suction time (CST), and specific resistance to filtration (SRF). Flocculation of the MFT suspension using the novel optimized nanoflocculants at 3000 ppm had 15 times faster ISR, and the supernatant turbidity, CST, and SRF had stronger outcomes than the traditionally used 20,000 ppm commercial anionic PAM. This study demonstrates the potential of designing nanoflocculants to effectively enhance settling and dewatering of oil sands tailings, while reducing the required amount of coagulants.
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