作　　者： (李宗楠）; (郭利杰）; (余斌）; (史采星）;

机构地区： 北京矿冶研究总院,北京100160

出　　处： 《黄金科学技术》 2017年第4期33-38,共6页

摘　　要： 高浓度尾砂浆的活化搅拌一直是矿山充填技术研究的重要方向,采用高速搅拌活化充填料浆是破坏充填料浆"团块"的有效办法,能够明显改善充填料浆的流变特性,提高其可输送性。高速搅拌过程的实质是对充填料浆进行快速剪切,不同的搅拌能对应不同的剪切速率,料浆的物化性质也相应地存在差异。为研究这种差异的规律并寻找高浓度尾砂浆的最佳活化能,针对某铜矿充填用尾砂,配制了浓度为70%的尾砂浆,采用新诺AM300S-H实验室搅拌机对尾矿浆开展了多种转速的搅拌实验,并采用Broofield R/SCCT型流变仪分别测试其流变参数,通过Bingham模型分析了剪切变稀特性。研究结果表明:高浓度尾矿浆的黏度(η_b)和屈服应力(τ_0)随搅拌速率(n)的增加而减小,表现出明显的剪切变稀特性,当转速达到400 r/min之后,尾砂浆的屈服应力不再明显减小,有趋于稳定的特性;在转速为120~1 000 r/min的范围内,其黏度与剪切转速之间的关系可用η_b=0.3n^(-0.1)表示。 The activation agitation of high concentration tailings slurry is an important research subject in mine filling technology.High speed stirring is an effective way to destroy the ＂micro aggregate＂in the filling slurry,which can improve the rheological properties and transportability of the filling slurry.High speed stirring means that the filling slurry was sheared rapidly.Different mixing energy,which corresponding to different shear rates,can lead to different physical and chemical properties of filling slurry.To get the law of this phenomenon and find out the best activation energy for high concentration tailings slurry,a kind of copper ore tailing slurry with a mass concentration of 70% has been prepared,stirring tests with different shear rates were carried out by a laboratory blender branded Xinnuo AM300S-H,rheological parameters were tested by Broofield R/S-CCT rheometer,shearing thinning behavior was analyzed based on Bingham model.It is shown that with the agitation speed（n）raised,the viscosity（η_b） and yield-shear-stress（τ_0） decreased,showing an obvious shearing thinning behavior.However,the yield shear stress tends to be stable when the stirring speed beyond 400 r/min.It was found that the relation of viscosity and agitation speed can be expressed as η_b=0.3n^（-0.1） when the stirring speed between 120 r/min and 1 000 r/min.

关 键 词： 剪切变稀 宾汉姆体 黏度 屈服剪应力 活化搅拌 高浓度尾砂浆