重介质悬浮液流变特性研究  

Research on rheological properties of dense-medium suspension

作　　者：韦鲁滨[1] 孟丽诚 程相锋[1] 李大虎[1] 朱学帅[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]汾西矿业集团运销管理中心,山西介休032000

出　　处：《煤炭学报》2016年第4期992-996,共5页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)资助项目(2012CB214904);国家自然科学基金资助项目(51574252);高等学校博士学科点专项科研基金资助项目(20120023110017)

摘　　要：针对颗粒沉降引发的选煤重介质悬浮液流变特性难以测定的难题,采用旋转黏度计结合线性拟合方法,提出了一种提高悬浮液黏度测量精度的方法。对密度1.45-1.80 g/cm3、煤泥含量0-0.30范围内的重介质悬浮液的流变特性进行了系统试验研究,考察了固体体积分数和煤泥含量对悬浮液流变特性的影响。结果表明：通常的选煤重介质悬浮液为假塑性流体;给定固体体积分数,随着煤泥含量增加,悬浮液的稠度系数近似线性减小、幂律指数增大;给定煤泥含量,随着悬浮液体积分数的升高,稠度系数近似线性增加、幂律指数减小;在重介质选煤工业应用的通常范围内,给出了悬浮液稠度系数和幂律指数的计算公式,相对误差基本在±10%范围内。The theoretical and numerical simulation research on dense medium separation involves the rheological properties of suspensions. The apparent viscosities in different conditions of dense-medium suspension were determined to study the influence of density,volumetric concentration and coal slime content on the rheological properties of medium suspension used in coal preparation. Linear fitting method was used to reduce the effect of particles sedimentation when measuring the apparent viscosity by the rotational viscometer on the range of density 1. 45- 1. 80 g / cm3 and coal slime content 0- 0. 30. The experiment results show that the dense medium suspension used in coal preparation is pseudoplastic fluid. When the volumetric concentration is constant,consistency coefficient decreases approximately linearly,and power law exponent increases with the increment of coal slime content. Under the condition of constant coal slime content,consistency coefficient increases approximately linearly,and power law exponent decreases with the volumetric concentration increasing. The equations for calculating consistency coefficient and power law exponent were put forward under the general conditions in industrial application of dense medium coal preparation respectively,and the relative deviation of the approximate formulas is less than ± 10%.

关 键 词：重介质 悬浮液 流变特性 假塑性流体 

分 类 号：TD94[矿业工程—选矿]