Evaluation of the flocculation and dewatering performance of dual polymers for treating oil sands tailings

doi:10.1002/cjce.24031

	Evaluation of the flocculation and dewatering performance of dual polymers for treating oil sands tailings
	Li, Xiaoxiao 1,2; Shen, Yang 3,4; Farinato, Raymond S.5; Somasundaran, Ponisseril 5; Zhang, Yuejun 6
刊名	CANADIAN JOURNAL OF CHEMICAL ENGINEERING
	2021-03-19
关键词	dewatering dual polymer flocculation oil sand tailings water‐ soluble polymers
ISSN号	0008-4034
DOI	10.1002/cjce.24031
通讯作者	Shen, Yang(ys2482@columbia.edu)
英文摘要	Mature fine tailings produced in the processing of oil sands create serious water-recovery problems; thus, it is important to characterize them and to improve the applicable dewatering technologies. Existing methods to dewater the tailings are found to be insufficient. Previous research has demonstrated that the addition of dual polymers is more efficient than using a single polymer to flocculate the fine tailings particles. Different from studies that took sophisticated procedures to assess the flocculation and dewatering efficiency of dual polymers, readily available and simple but effective experiments were conducted in this work. Evaluations were conducted with dual polymers comprised of low molecular weight poly(diallydimethylammonium chloride) (polyDADMAC) and high molecular weight cationic or anionic polyacrylamide (PAM). Turbidity and residual solids measurements for dewatered tailings treated with these polymers confirmed that the dual-polymer approach yield superior performance compared to either polymer functioning alone. Zeta potential and microscopic observations indicated that the dosages of polyDADMAC and PAM that lead to near charge neutralization of the system result in maximal performance. We hypothesize that when dual polymers are added to the tailings, polyDADMAC acts to neutralize the charge and destabilize the fine particles, while high molecular weight PAM, either cationic or anionic, acts to aggregate the destabilized fines by the bridging mechanism. PolyDADMAC forms weak and tiny flocs when mixed with tailings particles. Cationic PAM transforms these small flocs into much larger ones, while anionic PAM connects them into aggregates. Therefore, synergism exists between polyDADMAC and PAM but this synergism is different, based on the charge of the PAM.
资助项目	National Key Research and Development Program of China[2017YFC0703200] ; Sichuan science and technology program[2017JZ0028] ; Sichuan science and technology program[2018GZ0341]
WOS研究方向	Engineering
语种	英语
出版者	WILEY
WOS记录号	WOS:000631659000001
资助机构	National Key Research and Development Program of China ; Sichuan science and technology program
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/120973]
专题	中国科学院合肥物质科学研究院
通讯作者	Shen, Yang
作者单位	1.Chinese Acad Sci, Inst Solid State Phys, Hefei Inst Phys Sci, Hefei, Peoples R China 2.Chinese Acad Sci, Key Lab Photovolat & Energy Conservat Mat, Hefei, Peoples R China 3.Zhejiang Univ, Mech Engn, Hangzhou, Peoples R China 4.Zhejiang Univ, Zigong Innovat Ctr, Zigong, Peoples R China 5.Columbia Univ, Earth & Environm Engn, New York, NY USA 6.Nanjing Univ Sci & Technol, Sch Chem Engn, Nanjing, Peoples R China
推荐引用方式 GB/T 7714	Li, Xiaoxiao,Shen, Yang,Farinato, Raymond S.,et al. Evaluation of the flocculation and dewatering performance of dual polymers for treating oil sands tailings[J]. CANADIAN JOURNAL OF CHEMICAL ENGINEERING,2021.
APA	Li, Xiaoxiao,Shen, Yang,Farinato, Raymond S.,Somasundaran, Ponisseril,&Zhang, Yuejun.(2021).Evaluation of the flocculation and dewatering performance of dual polymers for treating oil sands tailings.CANADIAN JOURNAL OF CHEMICAL ENGINEERING.
MLA	Li, Xiaoxiao,et al."Evaluation of the flocculation and dewatering performance of dual polymers for treating oil sands tailings".CANADIAN JOURNAL OF CHEMICAL ENGINEERING (2021).