膏体尾矿屈服应力的塌落度试验研究
发布时间：2018-07-15 22:20
【摘要】：屈服应力是高浓度非牛顿膏体的关键流变参数,是膏体充填输送系统设计的基础。工程应用中采用塌落度这一经验参数评判其流动性,却无法获取准确的屈服应力参数值。通过构建圆柱和圆锥2种理论模型并利用模型与流变仪的测试结果对比,明确塌落度与屈服应力的反比例关系;通过模型计算屈服应力,在较低屈服应力,圆柱比圆锥模型计算结果准确。尾砂膏体塌落度试验表明增大塌落筒的尺寸可以提高模型计算结果的准确性。添加胶结剂的塌落度试验,因胶结剂的物理化学作用,颗粒间产生絮网结构形成悬浊液,料浆更加均质,却增加了料浆的内摩擦力,屈服应力升高。不同粗砂比的塌落度试验显示:因添加的粗颗粒降低了物料整体的比表面积,物料吸附水的能力下降,使大量水分子由吸附态转变为游离态,增强料浆的可流动性使料浆屈服应力显著降低。
[Abstract]:Yield stress is the key rheological parameter of high concentration non-Newtonian paste and the basis of the design of paste filling and conveying system. In engineering application, the empirical parameter of collapse degree is used to judge its fluidity, but the accurate yield stress parameter can not be obtained. By constructing two kinds of theoretical models of cylinder and cone and comparing the measured results of the model and rheometer, the inverse relation between collapse degree and yield stress is determined, the yield stress is calculated by the model, and the yield stress is lower. The cylinder is more accurate than the cone model. The results of tailings paste collapse test show that the accuracy of model calculation can be improved by increasing the size of caving tube. Because of the physical and chemical action of the binder, the suspending liquid was formed by the flocculation net structure between the particles, the slurry was more homogeneous, but the internal friction of the slurry was increased and the yield stress was increased because of the physical and chemical action of the binder. The results of collapse tests of different coarse sand ratios show that the addition of coarse particles reduces the specific surface area of the whole material, and the ability of absorbing water decreases, which makes a large number of water molecules change from adsorption state to free state. The fluidity of the enhanced slurry significantly reduces the yield stress of the slurry.
【作者单位】： 东北大学资源与土木工程学院;深部金属矿山安全开采教育部重点实验室;沈阳有色冶金设计研究院;麦吉尔大学采矿与材料工程系;
【基金】：国家重点研发计划项目(编号:2016YFC0801605)
【分类号】：TD853.3
本文编号：2125562
[Abstract]:Yield stress is the key rheological parameter of high concentration non-Newtonian paste and the basis of the design of paste filling and conveying system. In engineering application, the empirical parameter of collapse degree is used to judge its fluidity, but the accurate yield stress parameter can not be obtained. By constructing two kinds of theoretical models of cylinder and cone and comparing the measured results of the model and rheometer, the inverse relation between collapse degree and yield stress is determined, the yield stress is calculated by the model, and the yield stress is lower. The cylinder is more accurate than the cone model. The results of tailings paste collapse test show that the accuracy of model calculation can be improved by increasing the size of caving tube. Because of the physical and chemical action of the binder, the suspending liquid was formed by the flocculation net structure between the particles, the slurry was more homogeneous, but the internal friction of the slurry was increased and the yield stress was increased because of the physical and chemical action of the binder. The results of collapse tests of different coarse sand ratios show that the addition of coarse particles reduces the specific surface area of the whole material, and the ability of absorbing water decreases, which makes a large number of water molecules change from adsorption state to free state. The fluidity of the enhanced slurry significantly reduces the yield stress of the slurry.
【作者单位】： 东北大学资源与土木工程学院;深部金属矿山安全开采教育部重点实验室;沈阳有色冶金设计研究院;麦吉尔大学采矿与材料工程系;
【基金】：国家重点研发计划项目(编号:2016YFC0801605)
【分类号】：TD853.3
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