Microscale mechanism of tailing thickening in metal mines  

作　　者：Huazhe Jiao Wenbo Yang Zhu’en Ruan Jianxin Yu Juanhong Liu Yixuan Yang 

机构地区：[1]School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,China [2]School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2023年第8期1538-1547,共10页矿物冶金与材料学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.51834001)。

摘　　要：Water-locking flocs formed by ultrafine tailings particles will damage the thickener underflow concentration in the thickening process during paste preparation.The relationship between the mesostructure and seepage characteristics of tail mortar is typically ignored when investigating the deep dehydration stage.A shearing seepage test of an unclassified tailing-sedimentation bed was performed with copper tailings,and the morphology and geometric distribution of micropores were analyzed via X-ray computed tomography.Moreover,the shearing evolution of the micropore structure and seepage channel was investigated to evaluate the dewatering performance of underflow slurry using a three-dimensional reconstruction approach.The results show that porosity decreases considerably under shearing.The connected-pore ratio and the average radius of the throat channel reach peak values of 0.79 and 31.38μm,respectively,when shearing is applied for 10 min.However,the reverse seepage velocity and absolute permeability in the bed decrease to various extents after shearing.Meanwhile,the maximum flow rate reaches 1.537μm/s and the absolute permeability increases by 14.16%.Shearing alters the formation process and the pore structure of the seepage channel.Isolated pores connect to the surrounding flocs to form branch channels,which then become the main seepage channel and create the dominant water-seepage flow channel.

关 键 词：paste thickening computed X-ray tomography shear action pore structure seepage channel 

分 类 号：TD926.4[矿业工程—选矿]