Abstract: Mining method of cement backfilling with high density total tailings slurry has being extensively used in underground iron mines.The pipeline transportation of high density total tailings cemented backfilling slurry is an important part in the study of this mining method.Taking the cement backfilling mining with high density total tailings in Wuzhuang iron mine as raw material,backfilling pipes with inside diameters of 90 mm,113 mm and 122 mm were respectively chosen to study its in-pipe flow states by adopting double precision fluid software fluent-2ddp.According to the occurrence of the ore,the production scale of the mine and the properties of backfilling slurry,a numerical model of pipeline transportation system is built.The boundary conditions of the inlet and pipe walls are set up to make numerical calculating of slurry transportation process.The analysis on the calculation results showed that the pressure lost and velocity are most suitable when the slurry was transported by 113 mm pipe,compared with by 90 mm and 122 mm pipes.The slurry velocity surges at the bends and the slurry velocity inside is higher than one outside.The slurry velocity at the section distributes like a parabola and the highest velocity located at above the pipe center.

Key words: Inner diameter of pipe, Pressure loss, Flow speed of slurry, Numerical simulation