Investigating the Effect of Mixtures of Anionic Surfactants on the Potential Stability and Rheology of Coal-water Slurry using the Mixture Design Methodology

Abstract

In this study, with the objective of developing a cost-efficient and effective rheology modifier for the pipeline transportation of coal-water slurry (CWS), the effect of five anionic surfactants, which are Naphthalene-sulfonate formaldehyde condensate (NSF), Sodium tri-polyphosphate (STPP), Sodium silicate (SS), Sodium lignosulfonate (SLS), and Polyacrylic acid (PAA) and their mixtures on the potential stability Bituminous coal-water slurry was investigated using the mixture design methodology. Using this approach, the optimal mixture was defined as STPP:PAA:SS with proportions of 0.4:0.4:0.2. The addition of the anionic mixture to the CWS at a concentration of 0.75 wt% led to a significant increase in the potential stability of the CWS by 65.7% and a decrease in the apparent viscosity by 73.2%. The shear-thinning flow behavior of the CWS was also enhanced as the yield stress and the flow behavior index (n) were both substantially decreased by the addition of the anionic mixture, which also reduced the interfacial forces between the coal particles and water by lowering the surface tension of water. The adsorption mechanisms of the anionic surfactants on the surface of the coal and the effect of the type of the side chains on performance of the surfactants were also discussed.

Department(s)

Chemical and Biochemical Engineering

Keywords and Phrases

anionic surfactant; Coal water slurry; flow behavior; mixture design; rheology; zeta potential

International Standard Serial Number (ISSN)

1939-2702; 1939-2699

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2025 Taylor and Francis Group; Taylor and Francis, All rights reserved.

Publication Date

01 Jan 2025

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