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

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.