考虑温度的超细尾砂触变行为研究

Thixotropic behavior of superfine tailings considering temperature

为了探究不同温度下超细尾砂触变行为灵活性的规律,设计三因素四水平正交试验方案,利用温控式桨式流变仪,结合电子显微镜,分析温度、灰砂比和浓度对料浆触变性的影响规律,并从细观层面解释触变行为。结果表明:温度对较高浓度料浆的触变环形态影响最大;三种因素对触变性的影响顺序为浓度>温度>灰砂比,且灰砂比的影响水平与其他两因素不在同一个数量级;较之剪切试验前,料浆在剪切试验后内部絮团单体直径变大,且絮团分布明显变稀疏,与黏度降低现象一致。对触变行为做出了一般解释,为工业现场控制料浆触变性提供了理论依据。

In order to explore the law of the thixotropic behavior flexibility under different temperature for superfine tailings filling slurry,three factors and four levels orthogonal experiment is designed.The influence of temperature,cement-sand ratio and concentration on the thixotropy of slurry is analyzed by using paddle rheometer and electron microscope,and the thixotropy behavior is explained from the micro level.The results show that temperature has the greatest influence on the form of thixotropy ring of high-concentration slurry.The thixotropy is most affected by the concentration,followed by the temperature,and they are on the same order of magnitude.The effect of cement-sand ratio on thixotropy is much lower than that of other two factors.Compared with before shear test,the diameter of flocs in slurry increases after shear test,and the distribution of flocs becomes sparse,which is consistent with the decrease of viscosity.The general interpretation of thixotropic behavior is provided,and it is very useful to control the thixotropy of slurry in industrial field.