多因素耦合条件下高浓度全尾砂浆体流变性能研究

Study on rheological properties of high concentration unclassified tailings slurry under multi-factor coupling condition

为了探究多因素耦合条件下全尾砂料浆的流变性能,以某三个矿山的全尾砂料浆为试验对象,采用HAAKE同轴圆筒式流变仪进行试验,测得了5种质量浓度、3种温度条件下的全尾砂浆流变参数,分析了粒度分布、质量浓度及温度对流变参数的影响规律及机理。试验结果表明:同一矿山尾矿浆体,相同质量分数条件下,屈服应力随温度升高而降低,且浆体浓度越高,屈服应力的下降值越大;相同温度条件下,屈服应力随浓度增加而升高,且浆体温度越低,屈服应力增加值越大;料浆屈服应力的影响显著度为质量浓度>粒度分布>温度,质量浓度对流变性影响最为显著且可用指数函数描述;各因素间均存在一定的耦合作用,A矿和C矿尾砂浆的质量浓度高于71%、B矿尾砂浆质量浓度高于68%时,温度和浓度耦合作用明显,料浆的屈服应力和塑性黏度均明显上升。

In order to explore the rheological properties of unclassified tailings slurry under the condition of multi-factor coupling,taking unclassified tailings slurry from three mines as the test object,HAAKE coaxial cylindrical rheometer was used to carry out the test,the rheological parameters of unclassified tailings slurry under 5 mass concentrations and 3 temperature conditions were measured,and the influence law and mechanism of particle size,mass concentration and temperature on rheological parameters were analyzed.The test results show that the yield stress decreases with the increase of temperature for the same mine tailings slurry and the same mass fraction,and the higher the slurry concentration,the greater the decrease of yield stress.Under the same temperature condition,the value of yield stress increases with the increase of concentration,and the lower the slurry temperature,the greater the increase of yield stress.The influence significance degree of slurry yield stress is mass concentration>particle size>temperature.mass concentration has the most significant effect on rheological property and can be described by exponential function.There is a certain coupling effect between various factors.When the mass concentration of mine A and mine C tailing mortar is higher than 71%,and the mass concentration of mine B tailing mortar is higher than 68%,the coupling effect of temperature and concentration is obvious,and the yield stress and plastic viscosity of slurry are obviously increased.