Evaluation of the role of a cationic surfactant on the flow characteristics of fly ash slurry

Naik, H K; Mishra, Manoj Kumar; Karanam, U. M. Rao; Deb, D.

doi:10.1016/j.jhazmat.2009.03.016

Cited by 18 publications

(12 citation statements)

References 10 publications

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“…22 In addition to the cationic surfactant and biopolymer, anionic surfactant SDS also exhibits an excellent stabilizing effect on microfly ash slurry, which inhibited spontaneous coal combustion. 13,23…”

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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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%

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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“…Significant reduction of the viscosity of the slurry was obtained using a mixture of the surfactant (hydroxypropyl guar gum and xanthan gum) and the stabilizing agent (SDS). 20,21 In addition to viscosity, the yield stress of the FAS was also dropped to 50% using a low dose of the stabilizing agent (0.2−0.6%) without the incorporation of the surfactant, as reported by Naik et al 22 Besides the flow behavior of the slurry, leaching of heavy metals such as Cu, Ni, and Cd was achieved up to 85.5, 89.3, and 89.2%, respectively. 23 Though commercial additives showed potential applicability in FAS stabilization, the negative impact due to their chemical effect on the ecosystem and carbon footprints during production could not be avoided.…”

Section: Introductionmentioning

confidence: 63%

Sustainable Transportation, Leaching, Stabilization, and Disposal of Fly Ash Using a Mixture of Natural Surfactant and Sodium Silicate

Behera

Das²,

Mishra

et al. 2021

ACS Omega

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The present study evaluates the transportation, leaching, and stabilization ability of novel saponin extracted from the fruits of Acacia auriculiformis. To enhance the dispersing behavior of the fly ash slurry (FAS) at a lower dosage of sodium silicate, A. auriculiformis was incorporated in FAS. In addition to the rheological study, an attempt has been made to remove heavy metals through leaching for the safe disposal of FAS. Critical factors such as the fly ash (FA) concentration, saponin dosage, surface tension, ζ potential, temperature, and combination of saponin and sodium silicate, affecting the rheology of FAS, were extensively studied. The addition of a nonionic natural surfactant saponin has been proved to enhance the wettability of FA particles by decreasing the surface tension of FAS. The obtained rheology results were compared with the stabilization yield of the previously reported commercial surfactant cetyltrimethylammonium bromide. The incorporation of sodium silicate in the FAS system was found to be phenomenal in the settling and stabilization of FAS, thereby developing reaction products like sodium aluminum silicate (N-A-S). This facilitates the sustainable disposal of FA preventing air pollution after dewatering. The formation of N-A-S was further supported by scanning electron microscopy (SEM) and X-ray diffraction (XRD) studies.

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“…From the rheological standpoint, this has been identified and modelled as an effective particle concentration and maximum packing fraction through a structural parameter, thus causing an effective change on the relative viscosity down to a lower plateau for high shear rates (Quemada, 1998;Barnes, 2000). This characteristic has been also observed in slurries, including fly ash, tailings and silica suspensions (Horsley, 1982;Jones and Horsley, 2000;Naik et al, 2009). Transport characteristics may be also affected by chemistry.…”

Section: Calculation Hypothesesmentioning

confidence: 76%

Variables affecting energy efficiency in turbulent ore concentrate pipeline transport

Ihle

Tamburrino

2012

Minerals Engineering

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Evaluation of the role of a cationic surfactant on the flow characteristics of fly ash slurry

Cited by 18 publications

References 10 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

Sustainable Transportation, Leaching, Stabilization, and Disposal of Fly Ash Using a Mixture of Natural Surfactant and Sodium Silicate

Variables affecting energy efficiency in turbulent ore concentrate pipeline transport

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