Characteristics Of Velocity Field And Resistance Loss Of Superfine Tailings Pipeline With Large Flow Rate

Pipeline transportation is a key to ensure slurry to reach stope.To safe and efficient,slurry temperature's influence on rheological parameters,flow pattern and flow characteristics should be studied urgently.The ultra-fine tailings analyzed,the rheological test was explored.The rheological parameter prediction model and new flow pattern discriminant model were established,applied to simulation.Finally,the pipeline transport design was optimized for mines.The research contents include these aspects:1)The influences of temperature,concentration and gray-sand ratio on the rheological parameters of ultra-fine tailing mortar were verified,and the rheological parameter prediction model was established.The plastic viscosity and yield stress of superfine tailings mortar decrease with the increase of temperature and increase with the increase of mass concentration and gray-sand ratio.2)The model between temperature and Re is deduced and conveying L pipe model is established.Temperature influence on the flow state of superfine tailings mortar pipe is analyzed,the temperature and rheological parameters are fitted,and the Re model with temperature is constructed from fluid mechanics.This test condition is laminar flow.3)The flow characteristics of ultra-fine mortar is carried out.With temperature and velocity increasing,central max velocity increases,and decreases with diameter increasing.It reaches the max at 60?,2.8m/s,150 mm,the min at 30?,2.0m/s,210 mm.The area of flow core decreases with temperature and diameter increasing.The resistance loss decreases with temperature and diameter increasing,and increases with velocity decreasing.The rate of loss changes from 150 mm to 190 mm less than 190 mm to 210 mm.4)Proposed the mine pipeline transportation optimization proposal.Different filling pipelines and pipeline transport parameters on the resistance loss and flow velocity of ultra-fine tailings slurry is analyzed.Temperature 40??50?,pipe diameter 190 mm and flow rate 2.4m/s should be adopted for slurry transportation in the mine.Figure 53;Table 16;Reference 89...