Drag reduction of dense fine-grained slurries

Vlasák, Pavel; Chára, Zdeněk; Štern, P.

doi:10.2478/v10098-010-0024-y

Cited by 15 publications

(4 citation statements)

References 5 publications

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“…9 Viscosity and shear stress of slurry could be decreased by adding different additives, thereby enhancing the possibilities of a high percentage of solids in the slurry transportation. 10 Many investigators have examined the effects of various additives on the rheological behavior of fly ash slurry at high concentrations during pipeline transportation. A substantial reduction in the viscosity of the slurry was observed by using 0.1% sodium hexametaphosphate by mass.…”

Section: Introductionmentioning

confidence: 99%

“…The flow behavior of fly ash slurry depends on different factors, for instance, shape of particles, particle size distribution, solid concentration in slurry, and slurry viscosity . Viscosity and shear stress of slurry could be decreased by adding different additives, thereby enhancing the possibilities of a high percentage of solids in the slurry transportation . Many investigators have examined the effects of various additives on the rheological behavior of fly ash slurry at high concentrations during pipeline transportation.…”

Section: Introductionmentioning

confidence: 99%

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Stabilization and Rheological Behavior of Fly Ash–Water Slurry Using a Natural Dispersant in Pipeline Transportation

Das¹,

Pattanaik

Parhi

et al. 2019

ACS Omega

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Effective transportation of fly ash–water slurry through a pipeline from its generation site, a power plant, to a storage site by replacing commercial surfactants such as cetyl trimethyl ammonium bromide and sodium dodecyl sulfate by a natural dispersant extracted from Sapindus laurifolia was studied. The stability of fly ash slurry was determined from its rheological parameters, dispersant concentration, and stabilization mechanism. From surface tensiometric data, the critical micelle concentration of the dispersant was obtained to be 0.017 g/cc. The stabilization of high-concentration fly ash slurry has been studied through its rheological behavior by variation of temperature and dispersant and ash concentration. The rheological result obtained for fly ash concentrations in the range of 50–65% slurry was best justified by the Bingham plastic model. The wettability of fly ash particles is increased in the presence of dispersants, which is inferred from reduction of the surface tension value. The stabilization mechanism of the slurry is explained by a steric factor as indicated by the decrease in the zeta potential value. Air pollution is minimized at its destination site due to agglomeration of fly ash particles, which is confirmed from the SEM microphotograph.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stabilization and Rheological Behavior of Fly Ash–Water Slurry Using a Natural Dispersant in Pipeline Transportation

Das¹,

Pattanaik

Parhi

et al. 2019

ACS Omega

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“…This is due to the larger particle size distribution of desulfurization gypsum. Some studies have reported that the introduction of coarse particles will reduce the attraction between the particles in the paste, and lead to the destruction of the aggregates formed by the ultrafine particles, thereby reducing the viscosity of the paste [24]. Therefore, desulfurized gypsum is helpful to improve the fluidity of the paste.…”

Section: Fluiditymentioning

confidence: 99%

A Study on the Mechanical Properties and Hydration Process of Slag Cemented Ultrafine Tailings Paste Backfill

Li,

Wan,

Jin

et al. 2024

Sustainability

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Paste backfill prepared with ultrafine tailings often faces difficulties in meeting engineering requirements. To address the challenge of using ultrafine tailings, this work utilized a slag cemented ultrafine tailings paste backfill (SCUPB) composed of slag, Portland cement, and desulfurized gypsum as the cementitious materials, with a binder–tailing ratio of 1:4 and a solid mass concentration of 60%. The fluidity and compressive strength of the SCUPB were tested at 3 days, 7 days, and 28 days, while the microstructure and hydration process of the SCUPB were studied by scanning electron microscopy and isothermal calorimetry. The results reveal that the fluidity of the SCUPB decreases with the increase in the slag content and increases with the decrease in the c/g ratio. SCUPB attains the highest early compressive strength with a slag content of 70% and a c/g ratio of 3:2 (with the cement content at 18% and the desulfurized gypsum content at 12%). In this slag–gypsum–cement system, the combined activation of the slag by the cement and desulfurized gypsum exhibits a higher early compressive strength. This work utilized ultrafine tailings to prepare paste backfill that meets the engineering requirements, achieving the effective utilization of ultrafine tailings in mine backfilling projects.

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“…Study indicates that additives of different nature help reduce the values of viscosity and shear stresses of slurry, thus improving flow behaviour and creating a good chance to increase the percentage of solid parts in slurry (Vlasak et al, 2010). In literature, reports have been made on the effects of various additives on rheological properties of the FA slurry at high concentrations (Chandel et al, 2009a;Mosa et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the rheological behaviour of coal ash slurries

Assefa

Kaushal

2015

Journal of Hydrology and Hydromechanics

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Extensive experimental investigations were carried out to evaluate the rheological behaviour of fly ash (FA) slurry without and with the addition of bottom ash (BA) and BA slurry without and with the addition of FA. The FA slurries exhibited Bingham behaviour at solid mass concentrations ranging from 60-65% and mixing proportions from 10-40%. A substantial reduction in yield stress was observed except for mixing proportion of 40% on which the yield stress and viscosity were increased drastically for all solid concentrations. Hence, it can be concluded that the yield stress and viscosity of FA slurry were very much influenced by adding BA up to the mixing proportion of 30%. The rheological behaviour of BA slurries with and without the addition of FA in proportions of 10-50% was investigated and exhibited Newtonian behaviours for solid mass concentrations ranging from 30-50% without and with the addition of FA. The viscosity increases with increasing the solid concentrations and proportion of FA. Based on these experimental data, a correlation was developed to predict the relative viscosity of BA slurries as a function of solid volume fraction and FA mass proportion of 0-50% and the RMSE and R 2 values showed good agreement between the experimental and the predicted data.

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Drag reduction of dense fine-grained slurries

Cited by 15 publications

References 5 publications

Stabilization and Rheological Behavior of Fly Ash–Water Slurry Using a Natural Dispersant in Pipeline Transportation

Stabilization and Rheological Behavior of Fly Ash–Water Slurry Using a Natural Dispersant in Pipeline Transportation

A Study on the Mechanical Properties and Hydration Process of Slag Cemented Ultrafine Tailings Paste Backfill

Experimental study on the rheological behaviour of coal ash slurries

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