Rheological properties and concentration evolution of thickened tailings under the coupling effect of compression and shear

Aixiang Wu; Zhenqi Wang; Zhuen Ruan; Raimund Bürger; Shaoyong Wang; Yi Mo

doi:10.1007/s12613-024-2832-9

Volume 31 Issue 5

May 2024

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2024 > 31(5): 862-876

Aixiang Wu, Zhenqi Wang, Zhuen Ruan, Raimund Bürger, Shaoyong Wang, and Yi Mo, Rheological properties and concentration evolution of thickened tailings under the coupling effect of compression and shear, Int. J. Miner. Metall. Mater., 31(2024), No. 5, pp. 862-876. https://doi.org/10.1007/s12613-024-2832-9

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Aixiang Wu, Zhenqi Wang, Zhuen Ruan, Raimund Bürger, Shaoyong Wang, and Yi Mo, Rheological properties and concentration evolution of thickened tailings under the coupling effect of compression and shear, Int. J. Miner. Metall. Mater., 31(2024), No. 5, pp. 862-876. https://doi.org/10.1007/s12613-024-2832-9

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Research Article

Rheological properties and concentration evolution of thickened tailings under the coupling effect of compression and shear

+ Author Affiliations

Corresponding authors:
Zhenqi Wang E-mail: 15101014530@163.com

Zhuen Ruan E-mail: ustb_ruanzhuen@hotmail.com
Received: 26 October 2023; Revised: 12 January 2024; Accepted: 15 January 2024; Available online: 17 January 2024

Abstract

Abstract

Cemented paste backfill (CPB) is a key technology for green mining in metal mines, in which tailings thickening comprises the primary link of CPB technology. However, difficult flocculation and substandard concentrations of thickened tailings often occur. The rheological properties and concentration evolution in the thickened tailings remain unclear. Moreover, traditional indoor thickening experiments have yet to quantitatively characterize their rheological properties. An experiment of flocculation condition optimization based on the Box–Behnken design (BBD) was performed in the study, and the two response values were investigated: concentration and the mean weighted chord length (MWCL) of flocs. Thus, optimal flocculation conditions were obtained. In addition, the rheological properties and concentration evolution of different flocculant dosages and ultrafine tailing contents under shear, compression, and compression–shear coupling experimental conditions were tested and compared. The results show that the shear yield stress under compression and compression–shear coupling increases with the growth of compressive yield stress, while the shear yield stress increases slightly under shear. The order of shear yield stress from low to high under different thickening conditions is shear, compression, and compression–shear coupling. Under compression and compression–shear coupling, the concentration first rapidly increases with the growth of compressive yield stress and then slowly increases, while concentration increases slightly under shear. The order of concentration from low to high under different thickening conditions is shear, compression, and compression–shear coupling. Finally, the evolution mechanism of the flocs and drainage channels during the thickening of the thickened tailings under different experimental conditions was revealed.
- thickened tailings;
- compression–shear coupling;
- compressive yield stress;
- shear yield stress;
- concentration

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