Effect of extraction water chemistry on the consolidation of oil sands fine tailings

CIM Journal, Vol. 1, No. 2, 2010
W. G. Miller, WorleyParsons Services, Perth, Australia and J. D. Scott and D. C. Sego, University of Alberta, Edmonton, Alberta
Abstract

An overall study was conducted to evaluate the properties and processes influencing the rate and magnitude of consolidation for oil sands fine tailings produced using different extraction processes. As part of this overall study, consolidation tests using slurry consolidometers were carried out for caustic and non-caustic fine tailings. The influence of a change in bitumen extraction process (caustic versus non-caustic) on consolidation properties, namely compressibility and hydraulic conductivity, was determined, as was the effect of adding a coagulant (calcium sulphate [CaSO4]) to caustic fine tailings. For fine tailings originating from two different oil sands ores (Ore A and Ore B), results were presented in terms of variation in average void ratio with time (settlement), void ratio with effective stress (compressibility), hydraulic conductivity with void ratio and coefficient of compressibility and hydraulic conductivity with sodium adsorption ratio. Findings indicated that chemical characteristics of fine tailings (water chemistry, degree of dispersion) do not have a significant impact on their compressibility behaviour and have only a small influence at high void ratio (low effective stress). The biggest advantage of non-caustic fine tailings and treating caustic fine tailings with coagulant is an increased initial settlement rate and slightly increased hydraulic conductivity at higher void ratios. Thereafter, compressibility and hydraulic conductivity is governed by effective stress.


Une étude détaillée a été réalisée afin d’évaluer les propriétés et les processus influençant le taux et l’ampleur de la consolidation des résidus fins de sables bitumineux produits par différents processus d’extraction. Dans le cadre de cette étude détaillée, des essais de consolidation ont été effectués sur les boues en utilisant des oedomètres; les essais portaient sur des résidus fins caustiques et non caustiques. L’influence d’un changement dans le procédé d’extraction du bitume (caustique p/r non caustique) sur les propriétés de consolidation a été déterminée, soit la compressibilité et la conductivité hydraulique, en plus de l’effet de l’ajout d’un coagulant (sulfate de calcium [CaSo4]) aux résidus caustiques fins. Pour les résidus fins provenant de deux différents minerais de sables bitumineux (minerai A et minerai B), les résultats sont présentés en termes de la variation de l’indice des vides moyen dans le temps (tassement), de l’indice des vides par rapport à la contrainte effective (compressibilité), la conductivité hydraulique par rapport à l’indice des vides et la compressibilité et la conductivité hydraulique par rapport à l’adsorption du sodium. Les résultats indiquent que les caractéristiques chimiques des résidus fins (hydrochimie, degré de dispersion) n’ont pas d’impact significatif sur le comportement en compression et n’ont qu’une petite influence à des indices des vides élevés (faible contrainte effective). Le plus grand avantage des résidus fins non caustiques et du traitement des résidus fins caustiques avec un coagulant est un accroissement du taux initial de tassement et une légère augmentation de la conductivitéhydraulique à des indices des vides supérieurs. Ensuite, la compressibilité et la conductivité hydraulique sont une fonction de la contrainte effective.
Keywords: Oil sands, Fine tailings, Compressibility, Hydraulic conductivity, Consolidation, Large strain, Volume change, Void ratio, Settlement, Effective stress, Dispersion, Coagulant, Sodium adsorption ratio, Sables bitumineux, Résidus fins, Compressibilité, Conductivité hydraulique, Consolidation, Grande contrainte, Changement de volume, Indice des vides, Tassement, Contrainte effective, Dispersion, Coagulant, Taux d’adsorption du sodium
Full Access to Technical Paper
PDF version for $20.00
Other papers in CIM Journal, Vol. 1, No. 2, 2010
Search
Sort By:  Relevance
Showing results 1 - 7
Text
Summary:  
Publication: CIM Journal
Issue: 2
Volume: 1
Year: 2010
Text
Summary: The ground penetrating radar (GPR) method was used in a platinum mine in Zimbabwe by members of the Federal Institute for Geosciences and Mineral Resources (BGR). The measurements were carried out in boreholes and drifts. Electromagnetic reflections from a fault that consistently trends parallel to the mineralization zone permitted the mapping of the economically minable parts of the deposit. An introduction is given to the geology of the studied area and the application of the GPR method....
Publication: CIM Journal
Author(s): D. Eisenburger, C. Grissemann, V. Gundelach, W. Kahnt, and T. Oberthür, Federal Institute for Geosciences and Natural Resources, Hannover, Germany and
R. Thierbach, Ronnenberg, Germany
Keywords: Ground penetrating radar, Great Dyke, Main sulphide zone, Zimbabwe, Platinum mine, Géoradar, Grand Dyke, Zone principale de sulfures, Zimbabwe, Mine de platine
Issue: 2
Volume: 1
Year: 2010
Text
Summary: The ground-source heat pump is a low-carbon technology that uses the earth’s renewable geothermal energy to heat and cool buildings, with an efficiency 3 to 4.5 times that of conventional systems. These high performances are achieved by exchanging heat with the earth using a fluid that is groundwater, surface water or closed loop water. Expensive installations, such as water wells or buried coils, are however necessary to transport the fluid in and out of the earth, making ground-source heat...
Publication: CIM Journal
Author(s): J. Raymond, R. Therrien, and L. Gosselin, Université Laval, Québec, Québec
Keywords: Geothermal, Energy, Heat pump, Waste dump, Mouska, Doyon, Abitibi, Géothermie, Énergie, Thermopompe, Halde à stériles
Issue: 2
Volume: 1
Year: 2010
Text
Summary: The shaft bottom junction in a mine ventilation system is an important source of shock loss due to the combined effect of bend and area change. The occurrence of high-volume flow rates through this configuration can potentially result in high energy losses. The current research examines the process of shock loss at a characteristic shaft bottom junction of an underground coal mine. Investigations are performed on both laboratory-scale models and three-dimensional computational fluid dynamics...
Publication: CIM Journal
Author(s): T. Purushotham, University of Alaska, Fairbanks, Alaska, B. S. Sastry and B. Samanta, Indian Institute of Technology, Kharagpur, India
Keywords: k-? turbulence model, Forcing and exhausting ventilation shafts, Relative roughness, Shaft bottom length, Geometric and dynamic similitude, Modèle de turbulence, Puits d’évacuation et de forçage de la ventilation, Rugosité relative, Longueur au fond du puits, Similitude géométrique et dynamique
Issue: 2
Volume: 1
Year: 2010
Text
Summary: An overall study was conducted to evaluate the properties and processes influencing the rate and magnitude of consolidation for oil sands fine tailings produced using different extraction processes. As part of the overall study, a comprehensive description of physical and chemical characteristics of fine tailings generated by caustic and non-caustic processes was carried out. Ultimately, the influence of these fundamental properties on the compressibility, hydraulic conductivity and shear...
Publication: CIM Journal
Author(s): W. G. Miller, WorleyParsons Services, Perth, Australia, J. D. Scott and D. C. Sego, University of Alberta, Edmonton, Alberta
Keywords: Oil sands, Fine tailings, Index properties, Specific surface area, Water chemistry, Particle size distribution, Dispersion, Flocculation, Structure, Sodium adsorption ratio, Fines content, Coagulant, Sables bitumineux, Résidus fins, Propriétés caractéristiques, Surface spécifique, Hydrochimie, Granulométrie, Dispersion, Floculation, Structure, Rapport d’adsorption du sodium, Teneur en particules fines, Coagulant
Issue: 2
Volume: 1
Year: 2010
Text
Summary: Sorting has the potential to massively improve the profitability of mining base metal, hardrock ores. However, several barriers to the increased application of sorting have been identified, including a lack of mineral-specific sensors available to the industry. This paper presents the outcomes of a collaborative project to develop an induction-balance sensor specifically for low-grade copper and nickel ores. A review of the basic principles of induction-balance sensing and of the sensor-rock...
Publication: CIM Journal
Author(s): A. S. Bamber, University of British Columbia, British Columbia and D. J. Houlahan, MineSense Technologies, British Columbia
Keywords: Induction-balance sensing, Grade monitoring, Down-the-hole sensing, Conductivity sorting, Research and development (R&D), Détection par balance d’induction, Suivi de la teneur, Détection en fond-de-trou, Tri par conductivité, Recherche et développement
Issue: 2
Volume: 1
Year: 2010
Text
Summary: The development and evolution of the gravity recoverable gold (GRG) test procedure at McGill University is reviewed in this paper. Since the late 1980s, the research group led by the late Professor André Robert Laplante at McGill University has undertaken fundamental studies and applied research of the Knelson concentrator to develop a sustainable method of estimating GRG. Historically, a concept of “free gold” was used, and it was defined as the gold that could be separated and recovered...
Publication: CIM Journal
Author(s): L. Huang and S. Koppalkar, COREM, Québec, Québec
Keywords: Gravity recoverable gold, Gold ore characterization, Knelson concentrator, Centrifugal separation, Or à récupération gravimétrique, Caractérisation de minerais aurifères, Concentrateur Knelson, Separation centrifuge
Issue: 2
Volume: 1
Year: 2010
Powered by Coveo Enterprise Search