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

Abstract

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.

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

“…Since saponin adsorbs at the interface as a monomer only, the decrease in apparent viscosity is leveled up after the formation of CMC. 24,29 2.2. Optimization of Sodium Silicate at a Fixed Concentration of A. auriculiformis.…”

“…Moreover, the wettability of FA particles is significantly improved by adding an aqueous extract of S. laurifolia, which is confirmed by the decrease of the surface tension value (72 mN m −1 ) and becomes saturated at 40 mN m −1 . 24 The mechanism of stabilization is due to a steric factor that is shown to decrease the ζ potential value. 24,25 Thus, it is essential to explore innovative green additives having wide structural differences for their potential stabilizing ability.…”

“…24 The mechanism of stabilization is due to a steric factor that is shown to decrease the ζ potential value. 24,25 Thus, it is essential to explore innovative green additives having wide structural differences for their potential stabilizing ability.…”

Extraction of Silk Fibroin with Several Sericin Removal Processes and its Importance in Tissue Engineering: A Review

“…The plant origin bio-surfactants like Sapindus mukorosssi, Sapindus laurifolia, Acacia concinna, and Acacia auriculiformis due to their amphiphilic nature have been widely applied in various types of application such as surface modification of coal and fly ash in the preparation of slurry [52][53][54][55][56][57], dye degradation [58], removal of toxic elements from fly ash to prepare various composite materials [59,60] and solubilization, of organic compound in functional group interconversion process [61,62]. However their application in surface modification of silk surface is scanty.…”

Study and Analysis on the Influence Degree of Particle Settlement Factors in Pipe Transportation of Backfill Slurry

“…The stability of fly ash slurry was determined from its rheological parameters, dispersant concentration, and stabilization mechanism. The stabilization of high-concentration fly ash slurry has been studied through its rheological behavior by variation of temperature and dispersant and ash concentration [21,22]. Anupama Routray et al researched the flow behavior of coal water slurry (CWS) characterized with a mixture of non-ionic surfactant saponin from shikakai and a cationic surfactant di-docyl ammonium bromide (DDAB) at different coal loadings, pH, and dispersant dosages.…”