Rheology of Fly Ash Mixed Tailings Slurries and Applicability of Prediction Models

Lee, Joon Kyu; Ko, JaeYoun; Kim, Young Sang

doi:10.3390/min7090165

Cited by 23 publications

(14 citation statements)

References 30 publications

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“…Several models have been used to describe non-Newtonian behavior. 41,42,43,44,45 For construction materials, models such as Power law (Ostwald-deWaele), 36,44,45 Bingham and modified Bingham, 43,44,45,46,47 Herschel-Bulkley, 43,44,45,47 Casson, 43,44,45,47 Sisko, 43,45,46 De Kee, 43,44,47 and Carreau 45,48,49 (and many more) have been utilized. The Carreau model 50 has previously been shown to give the best prediction of non-Newtonian fluids of suspended solids.…”

Section: Analysis Of Shear Rate Dependent Viscositiesmentioning

confidence: 99%

The effect of microencapsulated phase change materials on the rheology of geopolymer and Portland cement mortars

et al. 2020

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The effect of microencapsulated phase‐change materials (MPCM) on the rheological properties of pre‐set geopolymer and Portland cement mortars was examined. Microcapsules with hydrophilic and hydrophobic shells were compared. The shear rate dependency of the viscosities fitted well to a double Carreau model. The zero shear viscosities are higher for geopolymer mortar, illustrating poorer workability. The time evolution of the viscosities was explored at shear rates of 1 and 10 s−1. New empirical equations were developed to quantify the time‐dependent viscosity changes. The highest shear rate disrupted the buildup of the mortar structures much more than the lower shear rate. Microcapsules with a hydrophobic shell affect the rheological properties much less than the microcapsules with a hydrophilic shell, due to the higher water adsorption onto the hydrophilic microcapsules. Shear forces was found to break down the initial structures within geopolymer mortars more easily than for Portland cement mortars, while the geopolymer reaction products are able to withstand shear forces better than Portland cement hydration products. Initially, the viscosity of geopolymer mortars increases relatively slowly during due to formation of geopolymer precursors; at longer times, there is a steeper viscosity rise caused by the development of a 3D‐geopolymer network. Disruption of agglomerates causes the viscosities of portland cement mortars to decrease during the first few minutes, after which the hydration process (increasing viscosities) competes with shear‐induced disruption of the structures (decreasing viscosities), resulting in a complex viscosity behavior.

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Section: Analysis Of Shear Rate Dependent Viscositiesmentioning

confidence: 99%

The effect of microencapsulated phase change materials on the rheology of geopolymer and Portland cement mortars

et al. 2020

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“…Similar to dewatering, the rheology of tailings is often characterized using shear yield stress, apparent viscosities, and compressive yield stress . In all studies, tailings have a non‐Newtonian behaviour, and this is expected given the high solids concentrations.…”

Section: Rheology In Mineral Processing Unit Operationsmentioning

confidence: 99%

Slurry rheology in mineral processing unit operations: A critical review

2019

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Knowledge of slurry rheology in mineral processing is essential for the optimization of wet-grinding, dewatering, transport, and tailings management and it is becoming important in flotation due to the increasing need to process complex ores with a high clay mineral content. Slurries of these ores often display complex rheological behaviour even at low solids concentration, and traditional rheology measurements in mineral processing, such as yield stress and apparent viscosities, may not provide the critical information needed for process optimization. The objective of this paper is to provide a comprehensive review of some of the previous rheology studies performed at the bench, pilot plant, and industrial scale for different unit operations and to discuss the potential for alternative rheology measurements to provide a better insight into colloidal particle interactions in slurries with clay minerals. Firstly, the fundamentals of slurry rheology and the influence of colloidal particles are presented. Secondly, rheology measurements for suspensions are described briefly. Thirdly, a review of rheology studies in grinding, classification, flotation, dewatering, and tailings management is done, outlining possible ways of determining types of particle associations in slurries. Finally, recommendations for future research directions are provided.

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“…Figures [12][13][14][15][16][17] indicated that the bleeding ratio of all slurry samples decreased as the temperature increased. The magnitude curves of cement slurries without fly ash showed larger variation than that with fly ash.…”

Section: Resultsmentioning

confidence: 99%

“…Fly ash with activity and cement forms a stable cement body. Lee et al [12] presented that the increase of temperature resulted in lower shear stress of the slurry mixtures. At the same time, the differences of shear stresses showed less sensitivity at high temperatures, indicating that the high temperature accelerated the hydration of fly ash.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Fluid Properties of Cement-Fly Ash Slurry Subjected to Multifactors

2021

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There are many factors affecting the characteristics of cement-fly ash slurry in practical engineering. Thus, this paper studies the influence of multifactors on the fluid properties of cement-fly ash slurry based on water-cement ratio ( w / c ) (0.75, 1, 1.25, and 1.5), fly ash content (0%, 10%, 20%, 30%, 40%, and 50%) and temperature (20°C, 40°C, 60°C, and 80°C). The bleeding ratio, initial setting time, final setting time, and viscosity were analyzed under coupling conditions. It is found that the water-cement ratio ( w / c ) is the main factor that affects the rheological properties and bleeding rate of slurry. The temperature affects the stability of the slurry in terms that the bleeding ratio of the slurry decreases as the temperature increases. The addition of fly ash enhances the stability of the slurry under different temperature conditions.

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Rheology of Fly Ash Mixed Tailings Slurries and Applicability of Prediction Models

Cited by 23 publications

References 30 publications

The effect of microencapsulated phase change materials on the rheology of geopolymer and Portland cement mortars

The effect of microencapsulated phase change materials on the rheology of geopolymer and Portland cement mortars

Slurry rheology in mineral processing unit operations: A critical review

Experimental Study on Fluid Properties of Cement-Fly Ash Slurry Subjected to Multifactors

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