Prediction of the Beach Profile of High-Density Thickened Tailings from Rheological and Small-Scale Trial Deposition Data

McPhail, Gordon

doi:10.36487/acg_repo/863_17

Cited by 17 publications

(23 citation statements)

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“… using a vane rheometer  through pipe loop testing  by means of beach trials based on the stream power-entropy methodology (McPhail, 1995(McPhail, , 2008.…”

Section: Influence Of Rheological Test Methodologymentioning

confidence: 99%

“…However, for these tailings there is significant difference in the full-scale beach slopes as indicated in Table 1. Also indicated in Table 1 is the yield stresses applicable to each slurry based on back-analysis of the full-scale beach profile using the stream power-entropy methodology (McPhail, 2008;Simms et al, 2011). There is a significant difference in the estimated yield stress.…”

Section: Influence Of Shear Thickeningmentioning

confidence: 99%

“…The stream power-entropy method of analysis (McPhail, 2008;Simms et al, 2011) has been used to predict the beach profiles for yield stresses of 20, 40, 60, 80 and 100 Pa. To ensure that the influence on beach profile is confined to variation in the yield stress, the slurry is taken as a Bingham plastic with a constant Bingham viscosity of 0.05 Pas. In reality, the factors discussed in Sections 2 to 6 also have an influence on the apparent viscosity with the changes in viscosity most likely emulating the changes in yield stress.…”

Section: Depositionmentioning

confidence: 99%

“…To assess the importance of viscosity on the beach profile prediction, consider the example mining situation applied in Section 9 but assume the yield stress is a constant 20 Pa, the flow diagram linear, and the resulting Bingham viscosity to vary from 0.02-0.5 Pas. Table 3 sets out beach profile results predicted, using the stream power-entropy method (McPhail, 2008;Simms et al, 2011). Table 3 Beach profiles for a range of yield stresses The influence of the Bingham viscosity on the beach slope is shown to be relatively minor compared with the yield stress, but an important factor nonetheless.…”

Section: Sensitivity Of the Beach Profile To Viscositymentioning

confidence: 99%

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Important considerations in the testing of high density tailings for beach profile prediction

McPhail¹,

Becerra²,

Barrera³

2012

Proceedings of the 15th International Seminar on Paste and Thickened Tailings

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The authors have conducted several investigations into the prediction of the beach profile of high density tailings and have found that there are a number of important considerations that need to be taken into account over and above the reliability of the beach profile prediction methodology. These considerations relate to the chemistry of the slurry and specifically the influence of pH and flocculation, both of which have a significant influence on the rheology of the slurry at the discharge point. A number of examples are discussed and a potential testing protocol that will assist in assessing the influence of chemistry ahead of the beach profile predictions is presented. A methodology for assimilating the results of the testing into the likely field situation is discussed and suggestions are made on application of the results in beach profile prediction. The suspected influence of residual flocculation on the stratification of the tailings slurry as it flows down the beach is also discussed.

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“… using a vane rheometer  through pipe loop testing  by means of beach trials based on the stream power-entropy methodology (McPhail, 1995(McPhail, , 2008.…”

Section: Influence Of Rheological Test Methodologymentioning

confidence: 99%

Section: Influence Of Shear Thickeningmentioning

confidence: 99%

Section: Depositionmentioning

confidence: 99%

Section: Sensitivity Of the Beach Profile To Viscositymentioning

confidence: 99%

See 2 more Smart Citations

Important considerations in the testing of high density tailings for beach profile prediction

McPhail¹,

Becerra²,

Barrera³

2012

Proceedings of the 15th International Seminar on Paste and Thickened Tailings

Self Cite

View full text Add to dashboard Cite

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“…Upon evaluation of the construction of parameter N and the associated restriction of having real solutions only if ( − 1) > 0, it is possible to think that this is achieved when N = 1. The approach of a limiting condition for beach slope estimation purposes has been recognised by different authors, such as McPhail (1995McPhail ( , 2008 using entropy maximisation criteria, Fitton (2007) and Pirouz and Williams (2007) using critical settling velocity criteria, or Li (2011) and Fourie and Gawu (2010) using limit equilibrium criteria.…”

Section: Definition Of a Limit Condition Criteria For Beach Slopes Anmentioning

confidence: 99%

Tailings beach slopes as a dimensionless parameter of non-Newtonian flows

Errázuriz¹

2018

Proceedings of the 21st International Seminar on Paste and Thickened Tailings

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The application of highly thickened tailings technologies is rapidly increasing due to the perceived benefits with respect to reduction of environmental impacts, water saving and potential reductions in dam size and impoundment footprint. Evaluation of these potential benefits requires that during design stages an understanding is developed of the range of feasible beach slopes to be achieved during deposition. A comprehensive evaluation of the operational factors influencing the beach formation process is paramount to ensure that expected performance during design stages is met throughout operations. This paper presents the derivation of a dimensionless parameter for non-Newtonian flows, associated with sheet flows on an inclined plane, which directly relates to the tailings beach slope expected to be formed due to subaerial disposal. This dimensionless parameter provides a closed expression for estimating tailings beach slopes based on rheological properties and discharge rates considering that sheet flow mechanisms occur. Conditions for sheet flow occurrence, such as level of further dewatering of the beach after deposition, active discharge times and geometry of active discharge areas, can be derived within this formulation. The dimensionless parameter and conditions found to promote sheet flow also allow to address the advantages and limitations of different discharge operation strategies, such as operating the tailings facility by sectors (allowing drying cycles) of varying geometries. Evaluation of this approach in the light of case histories is presented. Finally, discussion on how to evaluate the potential of having concave tailings beach profiles within this formulation is provided.

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