Effect of variations in the polar and azimuthal angles of coarse particles on the structure of drainage channels in thickened beds  

作　　者：Cuiping Li Gezhong Chen Zhu’en Ruan Raimund Bürger Yuan Gao Hezi Hou Hui Wang 

机构地区：[1]Key Laboratory of the Ministry of Education of China for High-efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing,Beijing 100083,China [2]Shunde Innovation School,University of Science and Technology Beijing,Foshan 528399,China [3]CI2MA and Departamento de Ingeniería Matemática,Facultad de Ciencias Físicas y Matematicas,Universidad de Concepcion,Casilla 160-C,Concepción,Chile [4]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China [5]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12期2321-2333,共13页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Key R&D Program of China(No.2022YFC2903803);National Natural Science Foundation of China(No.52130404);Guangdong Basic and Applied Basic Research Foundation(No.2021A1515110161);ANID(Chile)through Fondecyt project 1210610;Centro de Modelamiento Matemático(BASAL funds for Centers of Excellence FB210005);CRHIAM project ANID/FONDAP/15130015;Anillo project ANID/ACT210030。

摘　　要：The 3D reconstruction and quantitative characterization of drainage channels and coarse tailings particles in a bed were conducted in this study.The influence of variations in the azimuthal angle(θ)and polar angle(φ)of coarse particles on drainage channel structure was analyzed,and the drainage mechanism of the bed was studied.Results showed that water discharge in the bed reduced the size of pores and throat channels,increasing slurry concentration.The throat channel structure was a key component of the drainage process.Theφandθof particles changed predominantly along the length direction.The changes inφhad a cumulative plugging effect on the drainage channel and increased the difficulty of water discharge.The rake and rod formed a shear ring in the tailings bed with shear,and theθdistribution of particles changed from disorderly to orderly during the rotation process.The drainage channel was squeezed during the shearing process with the change inθ,which broke the channel structure,encouraged water discharge in the bed,and facilitated a further increase in slurry concentration.The findings of this work are expected to offer theoretical guidance for preparing high-concentration underflow in the tailings thickening process.

关 键 词：tailings thickening coarse particle azimuthal angle polar angle drainage channels 

分 类 号：TD926.4[矿业工程—选矿]