Flocculated unclassified tailings settling efficiency improvement by particle collision optimization in the feedwell

Huazhe Jiao; Weilin Chen; Aixiang Wu; Yang Yu; Zhuen Ruan; Rick Honaker; Xinming Chen; Jianxin Yu

doi:10.1007/s12613-021-2402-3

Volume 29 Issue 12

Dec. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(12): 2126-2135

Huazhe Jiao, Weilin Chen, Aixiang Wu, Yang Yu, Zhuen Ruan, Rick Honaker, Xinming Chen, and Jianxin Yu, Flocculated unclassified tailings settling efficiency improvement by particle collision optimization in the feedwell, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2126-2135. https://doi.org/10.1007/s12613-021-2402-3

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Huazhe Jiao, Weilin Chen, Aixiang Wu, Yang Yu, Zhuen Ruan, Rick Honaker, Xinming Chen, and Jianxin Yu, Flocculated unclassified tailings settling efficiency improvement by particle collision optimization in the feedwell, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2126-2135. https://doi.org/10.1007/s12613-021-2402-3

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Flocculated unclassified tailings settling efficiency improvement by particle collision optimization in the feedwell

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Corresponding authors:
Yang Yu E-mail: yuyang2005@139.com

Zhuen Ruan E-mail: ustb_ruanzhuen@hotmail.com
Received: 18 June 2021; Revised: 9 November 2021; Accepted: 21 December 2021; Available online: 25 December 2021

Abstract

Abstract

Efficient thickening of tailings is a prerequisite for the metal mine tailings backfill and surface disposal operation. The effective collision of ultrafine tailings particles in suspension with flocculant molecules is essential for flocs aggregates formation and settling. Unreasonable feeding speed and flocculant adding method will lead to the failure of effective dispersion of flocculant and high particle content in thickener overflow. In this work, the effect of turbulence intensity and flocculant adding method on floc size, strength, and movement characteristics are analysed. Aiming to solve the turbidity increased, a pilot-scale continuous thickening test was carried out. Taking a single particle and multiple flocs of full tailings as the research object, the particle iterative settlement model of flocs was established. The influence of turbulence intensity on collision effect is studied by tracking and simulating particle trajectory. The results show that in the process of single particle settlement, chaos appears in the iterative process owing to particle adhesion which caused by micro action. When the turbulence intensity is 25.99%, the maximum particle size of tailings floc is 6.21 mm and the maximum sedimentation rate is 5.284 cm·s⁻¹. The tailings floc presents a multi-scale structure of particle-force chain system when hindered settling, and the interweaving of strong and weak force chains constitutes the topological structure of particles. The results are applied to a thicker in plant, the flocculant addition mode and feed rate are optimized, and the flocs settling speed and overflow clarity are improved.
- unclassified tailings;
- flocculation settling rate;
- thickener feedwell;
- turbulence intensity;
- flocs micro-structure

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