Effect of deflocculants on the rheological behavior of high alumina matrix suspensions for self-flowing bauxite castable

Trubinsin M. A.; Furda L. V; Lisnyak V. V; Volovicheva N. A.; Doan Van Dat; Le Van Thuan

doi:10.15625/2525-2518/17143

Author affiliations

Authors

Trubinsin M. A. Belgorod State National Research University, 85 Pobeda, Belgorod City, 308015, Russia https://orcid.org/0000-0003-0898-3657
Furda L. V Belgorod State National Research University, 85 Pobeda, Belgorod City, 308015, Russia
Lisnyak V. V Belgorod State National Research University, 85 Pobeda, Belgorod City, 308015, Russia
Volovicheva N. A. Belgorod State National Research University, 85 Pobeda, Belgorod City, 308015, Russia
Doan Van Dat Faculty of Chemical Engineering, Industrial University of Ho Chi Minh City, 12 Nguyen Van Bao, Ho Chi Minh 70000, Viet Nam
Le Van Thuan Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, 03 Quang Trung, Da Nang, Viet Nam https://orcid.org/0000-0002-8787-1129

DOI:

https://doi.org/10.15625/2525-2518/17143

Keywords:

Self-flowing castables, matrix suspensions, deflocculants, rheological behavior

Abstract

This study investigates the influence of commercially available polyphosphates and polycarboxylate ethers as deflocculants on aqueous suspensions containing high alumina cement (HAC), reactive alumina (RA), and various matrix compositions. Utilizing rheological methods, the research explores the interplay between dispersant concentration and the apparent viscosity and flow behavior of RA suspensions and matrix mixtures. The Casson model is employed to effectively describe the obtained flow data. Moreover, the study discerns specific impacts of polycarboxylate ethers on the thickening properties of matrix mixtures characterized by varying RA and HAC contents. Additionally, the research evaluates the physical and mechanical properties of low-cement bauxite castables treated with a range of polycarboxylate esters. The findings demonstrate that all deflocculated suspensions exhibit Non-Newtonian structured fluid behavior with a discernible yield stress (τ₀) at shear rates below 20 s^-1. At higher shear rates, there is a significant reduction in apparent viscosity, aligning well with the Casson model. Comparative assessments, based on flow curve values τ₀, elucidate differing degrees of suspension flocculation depending on the type of dispersant used.

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