Numerical Simulation And Application Research Of High Concentration Of Cemented Full Tailing Backfilling Pipeline Transportation

High Density Tailing back filling mining has become a hot point of filling mining technology research on account of its prominent advantages of environmental protection, energy saving, emission reduction, safety and high efficiency. Considering the limitations of the theory and complexity of transportation of high density filling slurry, this paper adopts the indoor experiment, round-pipe experiment, numerical simulation and engineering to verify the combination method and establish the pipeline transportation resistance loss calculation method of high-density unclassified tailings slurry. The main research contents and results are as follows:(1) Round-pipe Experiment. On the basis of measurements of physical and chemical properties of full tailings materials and test results of mixture ratio and the slump, design and do full-size round-pipe experiment of different cement-sand ratio, different concentration and different conveying flow and collect pressure data and calculate the loss of frictional resistance of each segmented line.(2) Established the initial physical attributes numerical simulationparameter model of high-density unclassified tailings slurry. On the basis of round-pipe experiment of high-density unclassified tailings slurry,using ANSYS/FLOTRAN fluid dynamics analysis software to do analogue simulation of the pipeline of the full-size round-pipe experiment.Compared with frictional resistance loss of round-pipe experiment“horizontal straight pipe” section, conduct ANSYS/FLOTRAN numerical simulation of parameter optimization, and establish the initial physical attributes numerical simulation parameter model of high-density unclassified tailings slurry.(3) Verified in the project. On the basis of numerical simulation parametric model of the initial physical properties of high-density unclassified tailings slurry, analyze numerical simulation results and theoretical analysis results of high-density unclassified tailings slurry pipeline transportation and verify the feasibility of the initial physical attributes numerical simulation parameter model of high-density unclassified tailings slurry on transformation and application of high concentrations of total backfilling filling system of a certain mine in Anhui based on two-phase flow, rheology, etc related theories.(4) Analyzed change rule of high-density unclassified tailings slurry pipeline transportation resistance loss. On the basis of the validation of numerical model feasibility, do deep analysis and discussion of high-density unclassified tailings slurry pipeline numerical simulationresults. Considering slurry concentration and slurry flow, simulate transfer line velocity distribution, pressure distribution and maximum velocity distribution of elbow pipe and analyze change rule of high-density unclassified tailings slurry pipeline transportation resistance loss.In this project, a high-density unclassified tailings slurry cementation filling pipeline transport numerical simulation method directly reveals the intuitive reveal slurry in pipe flow dynamic characteristics and the frictional loss calculation result meets the requirements of engineering design. In order to obtain high concentration whole tailing cementation filling slurry in pipeline conveying in the process of frictional resistance loss and to provide new ideas and a reference for similar mines of high concentration mine filling system design, filling the relevant process parameters optimization and high concentration filling technology research have certain theoretical and practical significance in solving the issue of high-density unclassified tailings slurry pipeline conveying.