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Volume 102
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An approach to determine settling properties of flocculated tailings suspensions based on a single batch settling test
Lianfu Zhang a b *, Ke Yang b *, Feiyue Liu b, Lingshan Zhu b, Wentao Xia b, Hongjiang Wang c *, Xiang He b, Yongqiang Hou b
a Anhui Engineering Research Center of Exploitation and Utilization of Closed/abandoned Mine Resources, Anhui University of Science and Technology, Huainan, 232001, China
b School of Mining Engineering, Anhui University of Science and Technology, Huainan, 232001, China
c School of Civil & Resource Engineering, University of Science and Technology Beijing, Beijing, 100083, China
10.1016/j.partic.2025.04.003
Volume 102, July 2025, Pages 15-26
Received 3 December 2024, Revised 19 March 2025, Accepted 3 April 2025, Available online 12 April 2025, Version of Record 22 April 2025.
E-mail: lfzhang@aust.edu.cn; keyang@aust.edu.cn; wanghj1988@126.com
Highlights

• Zhang's approach is modified to enhance maximum settling velocity prediction.

• The MZ method exhibits superior prediction than DE and NM methods.

• The aggregate rarefaction is identified in the simulation of batch settling tests.


Abstract

Determining the settling properties of flocculated suspensions is crucial in the design and optimization of thickeners. A novel method was proposed to predict the settling parameters of the Vesilind function. Such a method determines the maximum settling velocity by minimizing the difference between the predicted and measured batch settling curves. The performance of the method was compared with those of the differential evolution (DE) and Nelder-Mead (NM) algorithms. The results indicate that the method predicts the settling parameters with higher accuracy than the DE and NM algorithms do. Finally, the thickening process of flocculated tailings suspensions in batch settling tests was simulated. An increase in flocculant dosage causes an increase in compressive yield stress, leading to aggregate rarefaction. Consequently, the underflow concentration decreases at high solid fractions of suspensions as flocculant dosage increases.

Graphical abstract
Keywords
Batch settling; Settling velocity; Thickening process; Aggregate rarefaction; Underflow concentration
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