The material level control of filling mixing equipment is the key to achieve the homogenization of slurry.Frequent fluctuations in material level and flow rate have a significant impact on the quality of the slurry and the transmission pipeline network,ultimately leading to a decrease in filling quality and an increase in cost.In order to solve the problem of difficulty in controlling the filling material level and discharging flow rate in a mine,a theoretical calculation model was constructed,and a formula for calculating the head loss of the mixing and discharging system was proposed.It is found that the diameter of the discharge pipe D is inversely proportional to the flow velocity v at the discharge port,and the yield shear stress to bulk density ratio τ0/γ,viscosity coefficientηto bulk density γ ratio(η/γ)are directly proportional to the material level Hj.The results of the filling material experiment indicate that as the slurry mass concentration Cw increases,τ0/γ、η/γ also increase,which is beneficial for improving the material level in the mixing tank.Taking slurry mass concentrations of 74％,72％,70％,68％,and discharge pipe diameters of 140,125 mm as variables,the calculation and analysis show that under two working conditions of Cw=7 4％,D=140 mm and Cw=72％,D=125 mm,the material level in mixing tank is 1.59 m and 1.65 m,respectively,which is within the optimal operating material level range of the mixing tank.
Material level of mixing tankFilling slurrySlurry mass concentrationSteady-state dischargeDischarge pipeNumerical simulation
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