1. School of Chemical and Environmental Engineering,China University of Mining and Technology(Beijing),Beijing　 100083,China;2. Marketing Manage-ment Center,Fenxi Mining Group Corporation Ltd. ,Jiexiu　 032000,China

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 medi- um 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 lin- early,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 vol- umetric 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% .

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)；

Wei Lubin,Meng Licheng,Cheng Xiangfeng,et al. Research on rheological properties of dense-medium suspension[ J]. Journal of China Coal Society,2016,41(4):992-996.