Influence of extraction process and coagulant addition on thixotropic strength of oil sands fine tailings

CIM Journal, Vol. 1, No. 3, 2010
W. G. Miller, WorleyParsons Services, Perth, Australia, J. D. Scott and D. C. Sego, University of Alberta, Edmonton, Alberta
Abstract

The influence of using different extraction processes (caustic versus non-caustic) on the thixotropic strength of oil sands fine tailings is examined, as is the influence of adding a coagulant to caustic fine tailings. The thixotropic strength of fine tailings at large void ratios manifests itself as a bonding or gel strength that has been widely noted both in the laboratory and in the field. This gel strength has a significant influence on preventing the initial consolidation or settlement of fine tailings. Differences between the fine tailings’ thixotropic strength development are explained based on their physical and chemical characteristics.


L’influence de l’utilisation de différents procédés d’extraction (caustiques p/r non caustiques) sur la résistance thixotropique des fins résidus de sables bitumineux est étudiée, en plus de l’influence de l’ajout d’un coagulant aux résidus fins caustiques. La résistance thixotropique des résidus fins à de grands indices de vides s’exprime par une force de liaison ou de gel qui a été bien reconnue, au laboratoire et sur le terrain. Cette résistance de gel a une influence significative sur la prévention de la consolidation initiale ou du tassement des résidus fins. Les différences entre la résistance thixotropique des divers résidus fins sont expliquées en se basant sur leurs caractéristiques physiques et chimiques.
Keywords: Oil sands, Tailings, Fine tailings, Caustic, Non-caustic, Coagulant, Shear strength, Vane shear, Thixotropy, Thixotropic strength, Sables bitumineux, Résidus, Résidus fins, Caustique, Non caustique, Coagulant, Résistance au cisaillement, Scissomètre, Thixotropie, Résistance thixotropique
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Summary: Erratum
Due to a printing error in Figure 3 in the following paper published in CIM Journal, Vol. 1, No. 2, p. 87, the corrected paper is being republished here in its entirety. Our apologies to the authors and readers for any inconvenience caused.
En raison d’erreurs d’impression au figure 3 du document suivant publié dans le CIm Journal, Vol. 1, no 2, p. 87, l’article corrigé est republié en entier. Nous nous excusons auprès des auteurs et des lecteurs pour tout désagrément.

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