| Xinyang Coal Mine of Fenxi Coal Mining Group carries out the thechnology ofbackfill mining with cemented materials of high concentration. This technology takescoal gangue, fly ash, cement and water as backfill materials, which not only solves thesolid waste, but also extractsthe coal resources under villages.This paper utilized themethods of SEM microstructure survey, energy spectrum analysis and XRD analysis toanalyze the physical and chemical properties of coal gangue, fly ash and cementedbackfill structures. Besides, the effect of admixtures on backfill slurries and structuresis also studied. Through the mix proportion experiment, the optimal mix proportion ofthe backfill materials is determined.On the basis of analyzingthe data obtained bylaboratory rheological experiment, the rheological model for the backfill slurry withhigh concentration is determined. Based on theoretical analysis, the mathematicalmodel for the pipeline trasportation of backfill slurry is developed. With the help ofCOMSOL Multiphysicssoftware, the numerical simulation of the flowing of backfillslurry is conducted. In addition, the frictional and local resistance losses of the backfillslurry through pipeline transportation are analyzed.Finally, the industrial application ofthe transportation of backfill slurry with high concentration is discussed. |
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