Study on the Movement and Deposition of Particles in Supercritical Water Natural Circulation Based on Grey Correlation Theory

Zhu, Lei; Zhou, Tao; Ding, Xunliang; Xuemeng, Qin; Zhang, Jialei

doi:10.3390/en12122315

Cited by 6 publications

(1 citation statement)

References 24 publications

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“…On the one hand, the engineering characteristics of tailings are not only determined by the physicomechanical properties but also related to the deposition characteristics. , Due to the impacts of ore drawing, damming technique, tailings piling modes, tailings properties, and tailings dam type, there are variations of the tailings particle size at different deposition sites after hydraulic sorting, − along with phenomena like cross-bedding, leading to the anisotropy of tailings dam body. The changes in particle size would result in variations in the dry beach and permeability of dam materials.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Tailings Deposition Distribution Pattern and Sedimentation Characteristics

Tian,

Zhao,

Gong

et al. 2024

ACS Omega

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Tailings pond accidents frequently occur during an extended period, resulting in loss of life and property, wastage of resources, and environmental pollution. Relying on tailings pond engineering, this paper carried out sample particle fragmentation experiments and settling column experiments to explore the deposition distribution pattern of tailings in both horizontal and vertical directions as well as the impact of particle size distribution on the sedimentation stratification effect. The results show that the median particle size on the dry beach surface in the horizontal direction slowly decreased with the increase in the distance from the subdam. The particle size of tailings showed great fluctuations in the vertical direction, which gradually became finer with the increase in the depth overall. At the same time, saturated sedimentation experiments suggested the inconsistent variation rule with the field test, namely, coarse on the bottom and fine at the top, and the change in particle size greatly affected the tailing sedimentation stratification effect. With the increase in fine particle content in tailings, the appearance time of the water–sand interface was shortened to within 30 min, but the sedimentation and consolidation completion times were delayed to about 1400 min. The settling column results indicate that the increase in fine particle content gradually weakened the sedimentation stratification effect, and the sedimentation pattern transformed from independent sedimentation to floc-type average sedimentation, which led to the enhanced water-retaining property of the settled layer. This may lead to an increase in the saturation line and a decrease in the length of the dry beach, seriously affecting the safe operation of the tailings pond. The research results provide some theoretical guidance and basic data for analyzing the consolidation efficiency of tailings and the stability of the tailings pond.

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