基于Washburn法的辉钼矿尺度效应分析及浮选响应  

Scale effect analysis and flotation responsse of Molybdenite based on Washburn method

作　　者：李树磊[1] 曹亦俊[1] 廖寅飞[1] 马子龙[1] 周贺鹏[2] 高丽慧[3] 王军超[4] LI Shulei;CAO Yijun;LIAO Yinfei;MA Zilong;ZHOU Hepeng;GAO Lihui;WANG Junchao(National Engineering Research Center of Coal Preparation and Purification,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;School of Resource and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China;School of Environment Science and Spatial Informatics,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)

机构地区：[1]中国矿业大学国家煤加工与洁净化工程技术研究中心,江苏徐州221116 [2]江西理工大学资源与环境工程学院,江西赣州341000 [3]中国矿业大学环境与测绘学院,江苏徐州221116 [4]中国矿业大学化工学院,江苏徐州221116

出　　处：《中国矿业大学学报》2022年第1期187-195,206,共10页Journal of China University of Mining & Technology

基　　金：中国博士后科学基金面上项目(2019M652025);国家自然科学基金面上项目(51574240);国家自然科学青年基金(51904299)。

摘　　要：辉钼矿是典型各向异性矿物,其表面性质显著影响矿物的浮选行为.为了研究不同粒级辉钼矿表面性质差异及浮选响应,本文采用Washburn动态法分析了-74+38,-38+20,-20μm 3个粒级辉钼矿表面热力学性质,进而研究了不同粒级辉钼矿颗粒的浮选行为,并计算了烃类油捕收剂分子与辉钼矿不同解理面作用差异.研究结果表明:辉钼矿"面"和"棱"亲疏水差异显著,随着粒度减小,辉钼矿表面的疏水性明显降低,且颗粒表面能增加显著,非极性分量降低,极性分量增加明显,-20μm粒级辉钼矿升至高表面能表面,极性强.随着粒度减小,辉钼矿浮选速度及产率均下降,对于-20μm粒级尤为明显;C_(12)H_(26)分子优先在(001)面吸附,而水分子则优先在(010)面吸附,C_(12)H_(26)在(001)面的吸附能远高于(010)面.因此常规烃类油难以有效改善微细辉钼矿表面疏水性,对微细粒辉钼矿浮选性能改善有限.Molybdenite is a typical anisotropic mineral,whose surface properties significantly affect the flotation behavior of particles.In order to further study the difference in surface properties of molybdenite particles with different sizes and response in the flotation,the washburn dynamic method was adopt to analyze the surface thermodynamic properties of molybdenite particles with sizes of-74+38,-38+20,and-20μm.The flotation behaviors of molybdenite particles with different sizes was studied and the interaction differences between hydrocarbon oil collector molecules and different planes of molybdenite were calculated.The research results show that the face and edge of molybdenite has significant differences in hydrophilicity and hydrophobicity.As the particle size decreases,the hydrophobicity of the molybdenite surface decreases significantly,and the surface energy of the particles increases significantly.Moreover,with the particle size decreases,the non-polar component decreases and polar component increases significantly.High surface energy surfaces with strong polarity are obtained by-20μm molybdenite particles.As the particle size decreases,the flotation speed and yield of molybdenite decreases,especially for the size of-20μm.C_(12)H_(26) molecules preferentially adsorb on the(001)plane,while water molecules preferentially adsorb on the(010)plane.The adsorption energy of C_(12)H_(26) on(001)plane is much higher than that on(010)plane.Therefore,conventional hydrocarbon oil is difficult to improve the surface hydrophobicity of fine molybdenite effectively,which limit recovery improvement of fine molybdenite particles in flotation.

关 键 词：辉钼矿 各向异性 极性 表面自由能 浮选 

分 类 号：TD952[矿业工程—选矿]