Particle aggregation and breakage kinetics in cemented paste backfill

Liuhua Yang; Hengwei Jia; Aixiang Wu; Huazhe Jiao; Xinming Chen; Yunpeng Kou; Mengmeng Dong

doi:10.1007/s12613-023-2804-5

Volume 31 Issue 9

Sep. 2024

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2024 > 31(9): 1965-1974

Liuhua Yang, Hengwei Jia, Aixiang Wu, Huazhe Jiao, Xinming Chen, Yunpeng Kou, and Mengmeng Dong, Particle aggregation and breakage kinetics in cemented paste backfill, Int. J. Miner. Metall. Mater., 31(2024), No. 9, pp. 1965-1974. https://doi.org/10.1007/s12613-023-2804-5

Cite this article as:

Liuhua Yang, Hengwei Jia, Aixiang Wu, Huazhe Jiao, Xinming Chen, Yunpeng Kou, and Mengmeng Dong, Particle aggregation and breakage kinetics in cemented paste backfill, Int. J. Miner. Metall. Mater., 31(2024), No. 9, pp. 1965-1974. https://doi.org/10.1007/s12613-023-2804-5

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Research Article

Particle aggregation and breakage kinetics in cemented paste backfill

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Corresponding author:
Liuhua Yang E-mail: yanglh2005@163.com
Received: 4 May 2023; Revised: 14 November 2023; Accepted: 4 December 2023; Available online: 8 December 2023

Abstract

Abstract

The macroscopic flow behavior and rheological properties of cemented paste backfill (CPB) are highly impacted by the inherent structure of the paste matrix. In this study, the effects of shear-induced forces and proportioning parameters on the microstructure of fresh CPB were studied. The size evolution and distribution of floc/agglomerate/particles of paste were monitored by focused beam reflection measuring (FBRM) technique, and the influencing factors of aggregation and breakage kinetics of CPB were discussed. The results indicate that influenced by both internal and external factors, the paste kinetics evolution covers the dynamic phase and the stable phase. Increasing the mass content or the cement–tailings ratio can accelerate aggregation kinetics, which is advantageous for the rise of average floc size. Besides, the admixture and high shear can improve breaking kinetics, which is beneficial to reduce the average floc size. The chord length resembles a normal distribution somewhat, with a peak value of approximate 20 μm. The particle disaggregation constant (k₂) is positively correlated with the agitation rate, and k₂ is five orders of magnitude greater than the particle aggregation constant (k₁). The kinetics model depicts the evolution law of particles over time quantitatively and provides a theoretical foundation for the micromechanics of complicated rheological behavior of paste.
- cemented paste backfill;
- particle kinetics;
- admixture;
- rheology

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