Effects of physical environment on induction time of air–bitumen attachment

Gu, Guoxing; Xu, Zhenghe; Nandakumar, K.; Masliyah, Jacob H.

doi:10.1016/s0301-7516(02)00128-x

Cited by 137 publications

(78 citation statements)

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“…For example, Gu et al (2003) found that the induction time for air bubbles at the bitumen surface decreased with increasing temperature in both deionized water and an industrial process water (Figure 14).…”

Section: Air-bitumen Attachment As a Function Of Temperaturementioning

confidence: 99%

“…figure 14. Induction time of air bubble-bitumen attachment as a function of temperature in deionized water and an industrial process water (Gu et al, 2003) figure 15. Sliding time of an oxygen bubble along a bitumen surface inclined 30 degrees to the horizontal, zero time was taken at the moment the rising bubble contacts the inclined bitumen surface figure 16.…”

Section: Role Of Chemical Additivesmentioning

confidence: 99%

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Effect of Operating Temperature on Water‐Based Oil Sands Processing

Long

Drelich

et al. 2007

Can J Chem Eng

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barrels per day (399 million barrels per year), representing an increase of 14% over year 2003. In 2005, the production was close to 1.3 million barrels per day. It is projected that the total bitumen production will reach 1.8, 2.6 and 4 million barrels per day by 2010 , 2014 and 2020 , respectively (CAPP, 2006.To recover bitumen from the oil sands, both surface mining and in situ technologies are currently used. For the oil sand deposits at a depth of less than 75 m, surface mining is economically feasible. Surface mining operation comprises of three Operating temperature is one of the most important controlling parameters in oil sands processing. Considering the massive energy consumption and green house gas emission, lowering the processing temperature is highly desirable. To achieve such an ambitious goal requires a comprehensive understanding on the role of temperature in oil sands processing. This paper provides an overview of major findings from existing studies related to oil sands processing temperature. The relation between temperature and bitumen recovery is discussed. The effect of temperature on the physiochemical properties of oil sand components, such as bitumen viscosity, bitumen surface tension and surface potentials of bitumen and solids, is analyzed. The interactions between bitumen and solids and between bitumen and gas bubbles as a function of temperature are recounted. Also discussed is the role of chemical additives in oil sand processing. It has been found that temperature affects nearly all properties of oil sands among which bitumen viscosity and bitumen-solids adhesion impose a prominent impact on bitumen recovery. The use of selected chemical additives can reduce bitumen viscosity and/or the bitumen-solids adhesion, and thus provide a possible way to process oil sands at a low temperature while maintaining a high bitumen recovery.La température de fonctionnement est l'un des plus importants paramètres de contrôle dans le traitement des sables bitumineux. Considérant la consommation massive d'énergie et les émissions de gaz à effet de serre, il est hautement souhaitable d'abaisser la température des procédés. Pour atteindre un objectif si ambitieux, il est nécessaire de bien comprendre le rôle de la température dans le traitement des sables bitumineux. Cet article donne un aperçu des principales découvertes des études existantes ayant trait à la température dans le traitement des sables bitumineux. La relation entre la température et la récupération de bitume est analysée. On examine également l'effet de la température sur les propriétés physiochimiques des composantes des sables bitumineux, telles que la viscosité du bitume, la tension de surface du bitume et les potentiels de surface du bitume et des solides. Les interactions entre le bitume et les solides et entre le bitume et les bulles de gaz en fonction de la température sont décrites. On examine également le rôle des additifs chimiques dans le traitement des sables bitumineux. On a trouvé que la température influait sur presque ...

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Section: Air-bitumen Attachment As a Function Of Temperaturementioning

confidence: 99%

Section: Role Of Chemical Additivesmentioning

confidence: 99%

Effect of Operating Temperature on Water‐Based Oil Sands Processing

Long

Drelich

et al. 2007

Can J Chem Eng

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“…12 In this case, the clays attach to the surface of the bitumen droplet, forming a layer of clays that impede the attachment of a flotation air bubble to a liberated bitumen droplet, which is considered as one of the major reasons for poor processability of high fines oil sands ores. 13 The attached clays to the bitumen surface can also cause problems in bitumen froth treatment by forming a rag layer. [14][15][16] The mechanism for bitumen slime coating has recently been studied in detail by Masliyah et al using atomic force microscopy (AFM) and zeta potential distribution measurement.…”

Section: Introductionmentioning

confidence: 99%

Role of Caustic Addition in Bitumen–Clay Interactions

et al. 2015

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Coating of bitumen by clays, known as slime coating is detrimental to bitumen recovery from oil sands using the warm slurry extraction process. Sodium hydroxide (caustic) is added to the extraction process to balance many competing processing challenges which include undesirable slime coating. The current research aims at understanding the role of caustic addition in controlling interactions of bitumen with various types of model clays. The interaction potential was studied by quartz crystal microbalance with dissipation monitoring (QCM-D). After confirming the slime coating potential of montmorillonite clays on bitumen in the presence of calcium ions, interaction of kaolinite and illite with bitumen was studied. To make our study more closely related to industrial applications, tailings water from bitumen extraction tests using Denver flotation cell at different caustic additions was used. At caustic dosage up to 0.5 wt.% of oil sands ore, a negligible coating of kaolinite on the bitumen was determined. However, at lower level of caustic addition illite was shown to attach to the bitumen, with the interaction potential decreasing with increasing caustic dosage. Increasing concentration of humic acids as a result of increasing caustic dosage was identified to limit the interaction potential of illite with bitumen.2 This fundamental study clearly shows that the critical role of caustics in modulating interactions of clays with bitumen depends on the type of clays, guiding the multi-billion dollar oil sands industry to identify clay type as a key operational variable.

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“…For example the wetting of mineral phases by bitumen and bitumen extracts plays an important role in bitumen recovery and has been studied in the past (Basu et al, 1996;Drelich et al, 1994;Drelich and Miller, 1992). The phenomena of oil displacement (Basu et al, 1996;Drelich et al, 1995;Gu et al, 2003) and bubble attachment (Dabros et al, 1995;Dabros et al, 2000;Gu et al, 2003) in oil sands recovery have been considered. Finally, interactions between bitumen droplets in water (Laroche et al, 2002;Wu et al, 1999) and between oil droplets and silica have received consideration.…”

Section: Introductionmentioning

confidence: 99%

Surface Characteristics of Kaolinite and Other Selected Two Layer Silicate Minerals

et al. 2007

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University of Alberta has contributed to the understanding of these surface and colloid chemistry problems. His research in this area focused on characterization of flotation columns (Pal and Masliyah, 1989), oil displacement (Basu et al., 1996), and the analysis of interaction forces in bitumen-containing systems Liu et al., 2002;Wang et al., 2003;Wu et al., 2000;Yang et al., 1999).One area of oil sands processing technology that needs to receive further consideration is the surface and colloid chemistry of clay minerals. In this regard, discussion of the surface and colloid chemistry of the two layer silicate minerals seems to beThe electrokinetic features and interfacial water structure, as revealed from molecular dynamics simulations (MDS) are considered with respect to the anisotropic features of selected two layer silicate minerals. Planar structures of kaolinite and antigorite are compared to the, compositionally equivalent, tubular structures of halloysite and chrysotile with respect to the pH dependency of zeta potential as determined from the electrophoretic mobility measurements. The importance of the atomic mismatch between the tetrahedral and octahedral sheets in a particular bilayer is discussed in order to explain the electrokinetic behaviour of these two layer silicate minerals.Interfacial water structure from MDS suggests that the silica tetrahedral surface is not wetted by water. In the case of planar silicates structural imperfections are considered to explain wetting characteristics. The possibility of polarity reversal (domain inversion) within a tetrahedral/ octahedral layer and an out-of-order layer (inserted layer) within the tetrahedral/octahedral stack are considered in order to explain electrokinetic behaviour and wetting characteristics.Les caractéristiques électrocinétiques et la structure de l'eau interfaciale, telles qu'elles sont révélées par les simulations de dynamique molécu-laire (MDS), sont examinées pour déterminer les caractéristiques anisotropes des minéraux de silicate à double couche sélectionnés. Les structures planaires de la kaolinite et de l'antigorite sont comparées aux structures tubulaires, de composition équivalente, de l'halloysite et du chrysotile pour ce qui a trait à la dépendance au pH du potentiel zéta telle qu'elle est déterminée par les mesures de mobilité électrophorétique. L'importance de la non-concordance atomique entre les feuilles tétraédriques et octaédriques dans une bi-couche particulière est examinée afin d'expliquer le comportement électrocinétique de ces deux matériaux de silicate à deux couches.La structure de l'eau interfaciale révélée par les simulations MDS suggère que la surface tétraédrique de la silice n'est pas mouillée par l'eau. Dans le cas de silicates planaires, on pense que des imperfections structurales expliquent les caractéristiques de mouillage. La possibilité d'inversion de polarité (inversion de domaine) dans une couche tétraédrique/octaédrique et la présence d'une couche non-ordonnée (couche insérée) dans l'assemblage tétraè...

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Effects of physical environment on induction time of air–bitumen attachment

Cited by 137 publications

References 14 publications

Effect of Operating Temperature on Water‐Based Oil Sands Processing

Effect of Operating Temperature on Water‐Based Oil Sands Processing

Role of Caustic Addition in Bitumen–Clay Interactions

Surface Characteristics of Kaolinite and Other Selected Two Layer Silicate Minerals

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