Rheology for deposition control of polymer-amended oil sands tailings

Mizani, Shabnam; Simms, Paul; Wilson, Ward

doi:10.1007/s00397-017-1015-2

Cited by 19 publications

(36 citation statements)

References 17 publications

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“…More importantly, the flocculated MFT experiences shearing as well when it is pumped and transported by pipeline and discharged to the deposition site (Ren et al, 2014). Consequently, it is suggested that the flume test may be more appropriate than the vane test for flocculated MFT as the yield stress from a flume test may be more characteristic of the behaviour during surface deposition considering the similarity between a flume test and field deposition, as reported by Mizani et al ( , 2014.…”

Section: Comparison Between Laboratory Flume Test and Mini-slump Testmentioning

confidence: 87%

Using the flume test for yield stress measurement of thickened tailings

Gao

Fourie

2015

Minerals Engineering

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Section: Comparison Between Laboratory Flume Test and Mini-slump Testmentioning

confidence: 87%

Using the flume test for yield stress measurement of thickened tailings

Gao

Fourie

2015

Minerals Engineering

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“…where the material does not deform under a certain stress threshold (Babaoglu, 2014;Henriquez, 2009). However, more advanced rheological models have proven to be a better fit for a broader range of conditions (Mizani & Simms, 2017). Thixotropic rheology relies on a stress-history dependant structure parameter to dictate the evolution of the material (Hewitt & Blamforth, 2013;Coussot & al., 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Firstly, simulation of experimental data for bench scale studies will be carried out. This includes Newtonian (Cruchaga & al., 2007), Bingham (Gao & Fourie, 2018;Babaoglu, 2014;Henriquez & Simms, 2009), and thixotropic (Mizani, 2017) constitutive models.…”

Section: Objectivesmentioning

confidence: 99%

“…Recent research has shown tailings to be a thixotropic material (Nguyen & al., 1998, Mizani & al., 2017, Mizani and Simms 2016; one that gains or loses strength as a function of the shearing efforts to which it is subjected. This process is dictated by the reversible formation of microstructural bonds between attractive particles.…”

Section: Introductionmentioning

confidence: 99%

“…One of the problems with the use of a Bingham model is that the measured yield stress is largely dependant on the measurement technique and range of shear strain values (Nguyen & al., 2006, Mizani & al., 2017, 2013. Since the variation in applied shear is important when going between bench scale and field scale flow, some discrepancies can occur.…”

Section: Introductionmentioning

confidence: 99%

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Field Scale Flow Modeling of Thixotropic Mine Tailings Using the Material Point Method

Parent¹

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Understanding free surface flow of mine tailings is necessary to plan deposition operations in tailings' storage facilities (TSF), and is important to predict the consequences of a dam break. Proper understanding of deposition operations has probably hindered adoption of alternative tailings technologies, wheras recent failures of tailings impoundments have had catastrophic consequences. Flow behavior is crucial to understand for effective risk mitigation. Tailings exhibit thixotropic properties-their behavior is a function of the material's stress history. A thixotropic constitutive model has been implemented into an open-source Material Point Method (MPM) framework. The results were validated with previous experimental data at laboratory scale and compared with Bingham rheology with good agreements. Large-scale simulations were done for 2D and 3D cases. The thixotropic model was able to model self-forming channels seen during field scale deposition, which Bingham rheology is unable to capture. Dam break events also scaled differently from laboratory scale experiments with thixotropy. This can possibly be an element that explains longer runouts then initially predicted with standard rheology.

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Polymeric flocculation of oil sands tailings: Unveiling rheological indicators and dynamics of bitumen release

Sasar,

Johnston,

Santagata

2024

Can J Chem Eng

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Polymeric flocculation is widely used to accelerate the dewatering and consolidation of oil sands fluid fine tailings (FFTs). Optimizing flocculation requires a fundamental understanding of the changes to the internal structure of the material with polymer addition. Key challenges include sensitivity of flocculation to polymer dose, mixing conditions, and composition of individual FFTs. Moreover, despite the environmental implications, little is known of the effects of flocculation on the mobility of the residual organics present in the tailings. In this paper, advanced rheological tests are used to probe the formation and development of the polymer–clay structure during flocculation in near‐real time. This is achieved through a novel setup for controlled delivery of the polymer directly into the measuring cell of a rheometer. This enables continuous monitoring of the rheological parameters during the flocculation process and yields consistent and reproducible samples. An optical monitoring system is used to relate rheological measurements to water release and to changes in the surface accumulation of the residual bitumen. The water‐release polymer dose is found to be associated with a distinct rheological response highlighting the potential use of rheometry for polymer dosing/mixing optimization in real time and on a continuous basis in thickeners and inline flocculation systems.

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Rheology for deposition control of polymer-amended oil sands tailings

Cited by 19 publications

References 17 publications

Using the flume test for yield stress measurement of thickened tailings

Using the flume test for yield stress measurement of thickened tailings

Field Scale Flow Modeling of Thixotropic Mine Tailings Using the Material Point Method

Polymeric flocculation of oil sands tailings: Unveiling rheological indicators and dynamics of bitumen release

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