Impact of flocculation-based dewatering on the shear strength of oil sands fine tailings

被引:62
|
作者
Beier, Nicholas [1 ]
Wilson, Ward [1 ]
Dunmola, Adedeji [2 ]
Sego, David [1 ]
机构
[1] Univ Alberta, Dept Civil & Environm Engn, Markin CNRL Nat Resources Engn Facil, Edmonton, AB T6G 2W2, Canada
[2] Shell Canada Energy, Calgary, AB, Canada
关键词
mature fine tailings; oil sand tailings; flocculation; dewatering; sensitive clay; polymer; EXTRACTION; BITUMEN; CLAYS;
D O I
10.1139/cgj-2012-0262
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The oil sands in northern Alberta have been mined to produce bitumen over the past five decades. Since the 1980s, technical advances have been made in mining, material handling, and bitumen extraction. However, acquiring practical methods to control and reduce the fluid fine tailings build-up has been an ongoing challenge. Recent regulatory changes have driven the industry to review current tailings-management techniques and investigate numerous alternative technologies and processes to manage and reclaim fine tailings. Many of these fine tailings-management techniques involve some form of polymer or chemical addition to promote dewatering and strength gain to meet the regulatory requirements. Based on the reported data, the chemically amended fine tailings deposits have the characteristics of sensitive, metastable deposits, necessitating additional mitigative measures by oil sands operators beyond the regulatory requirements. This paper explores the geotechnical aspects of meeting regulatory strength performance criteria by employing flocculation-based dewatering of fluid fine tailings.
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页码:1001 / 1007
页数:7
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