Early-age strength property improvement and stability analysis of unclassified tailing paste backfill materials

Qian Zhou; Juan-hong Liu; Ai-xiang Wu; Hong-jiang Wang

doi:10.1007/s12613-020-1977-4

Volume 27 Issue 9

Sep. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(9): 1191-1202

Qian Zhou, Juan-hong Liu, Ai-xiang Wu, and Hong-jiang Wang, Early-age strength property improvement and stability analysis of unclassified tailing paste backfill materials, Int. J. Miner. Metall. Mater., 27(2020), No. 9, pp. 1191-1202. https://doi.org/10.1007/s12613-020-1977-4

Cite this article as:

Qian Zhou, Juan-hong Liu, Ai-xiang Wu, and Hong-jiang Wang, Early-age strength property improvement and stability analysis of unclassified tailing paste backfill materials, Int. J. Miner. Metall. Mater., 27(2020), No. 9, pp. 1191-1202. https://doi.org/10.1007/s12613-020-1977-4

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Research Article

Early-age strength property improvement and stability analysis of unclassified tailing paste backfill materials

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Corresponding author:
Juan-hong Liu E-mail: juanhong1966@hotmail.com
Received: 23 October 2019; Revised: 26 December 2019; Accepted: 26 December 2019; Available online: 21 August 2020

Abstract

Abstract

High-density tailings, small cementitious materials, and additives are used for backfill materials with poor early compressive strength (ECS), which may greatly affect the mining and backfill cycle, to prepare paste backfill materials (PBMs) with a high ECS. The effects and mechanisms of different early strength agents on the property of PBM are investigated. The action mechanism of additives on the properties of PBM is also analyzed through X-ray diffraction, scanning electron microscope, and energy dispersive spectrometry. Results show that the effects of single-component additives 1, 3, and 6 are better than those of the other additives, and their optimal dosages are 3wt%, 1wt%, and 3wt%, respectively. The optimum multicomponent combinations are 1wt% of additive 1 and 1.5wt% of additive 6. The ECS of the paste with additive 10 increases to a greater extent than that of the other pastes because of the synergistic action of additive 1 with additive 6. The hydration product of Ca(OH)₂ is consumed, and more C–S–H gels are generated with the addition of additives to paste. Tailings particles, ettringite crystals, and gels intertwined with one another form a dense net-like structure that fills the pores. This structure can significantly improve the ECS of PBM.
- paste backfill;
- unclassified tailings;
- binder powder;
- early-age strength;
- microstructure

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