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Fractal and microscopic quantitative characterization of unclassified tailings flocs

International Journal of Minerals,Metallurgy and Materials 2021年第9期28卷 1429-1439页

作者： Di Zheng Wei-dong Song Yu-ye Tan Shuai Cao Zi-long Yang Li-juan Sun State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education University of Science and Technology BeijingBeijing 100083China School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory for Nonlinear Mechanics(LNM) Institute of Mechanics Chinese Academy of ScienceBeijing 100190China

A series of laboratory investigations are conducted to analyze the effect of flocculant type on the spatial morphology and microstructural characteristics of flocs during the flocculation and settling of *** flocculant types(i.e.,ZYZ,JYC-2,ZYD,and JYC-1)are considered in this *** fractal characteristics and internal structures of tailings flocs with different flocculant types and settlement heights are analyzed by conducting scanning electron microscopy and X-ray micro-computed tomography scanning experiments based on the fractal *** show that unclassified tailings flocs are irregular clusters with fractal characteristics,and the flocculation effect of the four flocculant types has the following trend:ZYZ>JYC-2>ZYD>*** size and average grayscale value of tailings flocs decrease with the increase in settlement *** average grayscale values at the top and bottom are 144 and 103,*** settlement height remarkably affects the pore distribution pattern,as reflected in the constructed three-dimensional pore model of tailings *** top part of flocs has relatively good penetration,whereas the bottom part of flocs has mostly dispersed *** number of pores increases exponentially with the increase in settlement *** contrast,the size of pores initially increases and subsequently decreases with the increase in settlement height.

关键词： tailings flocs fractal dimension settlement height grayscale value three-dimensional pore model

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