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料浆的流变特性是实现料浆管道输送的基础,影响着管路设计与阻力计算等技术问题.废石-尾砂料浆的水灰比或骨料性质都不同于混凝土及全尾砂浆,料浆结构更加复杂,确定最佳管输料浆组合变得更加困难.通过对某矿山废石和尾砂的级配分析,选用废石和尾砂优化后的配合比(6∶4,7∶3,8∶2)制成高浓度料浆进行流变实验,首先回归流变曲线获取流变参数,其次应用灰色关联理论对屈服应力及粘度的影响因素进行排序与分析,最后应用Deport Expert软件确定优化后的料浆组合.结果表明水泥添加量和质量浓度是屈服应力的决定因素;废石-尾砂比是粘度的主要影响因素,水泥量、质量浓度次之;料浆的优化组合为废尾比取1.40,质量浓度取82%,水泥添加量取275.29 kg/m3.此研究为矿山自流充填管道输送提供了理论依据.
The rheological properties of slurry is the basis for the realization of slurry pipeline transportation and affects the technical problems of pipeline design and resistance calculation etc. The water-cement ratio or aggregate properties of waste rock-tail slurry are different from those of concrete and full-tail mortar , The structure of the slurry is more complicated, and it is more difficult to determine the optimal pipe slurry composition.Based on the grading analysis of waste rock and tailings in a mine, the optimized ratio of waste rock and tailings is selected (6: 4, 7: 3, 8: 2) were used to make the high concentration slurry for rheological experiments. The rheological parameters were first returned to the rheological curve, and then the gray correlation theory was used to rank and analyze the influence factors of yield stress and viscosity. Finally, Deport Expert software The results show that cement content and mass concentration are the determinants of yield stress. The ratio of waste rock to tailings is the main influencing factor of viscosity, and the cement content and mass concentration are the second. The optimal combination of slurry is The tail waste ratio is 1.40, the mass concentration is 82%, and the amount of cement is 275.29 kg / m3. This study provides a theoretical basis for the gravity pipeline transportation.