Study Of The Rheological Properties Of Tailings Backfilling Slurry And The Transport Properties Of High-density Backfilling Slurry

This article based on the engineering fluid dynamics, rheology, two-phase fluid pipeline transportation theory and so on. The integrated use of literature search, laboratory testing, mechanical analysis and other means were performaced to solve the practical issue of a mine,about high-density slurry gravity flow pipeline transportation backfill system. Aiming at high-density cemented backfilling slurry, this paper put up systematic and deep research to theory and technology. Main contents and main conclusions of this paper are summarized as follows:(1) The thesis is focused on the discussion of high-density cemented backfilling slurry of the classified tailings 0r the unclassified tailings. We analysed the physical and chemical properties of the tailings form the several aspects such as material physicochemical property, particle size distribution, settle ability and permeability. It's the foundation and the Premise of backfilling slurry study. The tailings have stable physical and chemical properties, good settle ability and poor permeability. The particle size distribution of the unclassified tailings is more appropriate.(2) The study of influence factors of filling body intensity is by performing a series of ratio tests. The search for control measures of filling body intensity bases on quantitative analysis of tests data. By curve fitting analysis, optimal ratio is presented.(3) Using round-pipe experiment system of Changsha Institute of Mining Research,we get some friction resistance losses under various operating conditions and research the main factors that determinates the pipe conveying parameteer scope,to find the critical factor of the stability and reliability of high-density slurry gravity flow pipeline transportation backfill system.(4) The study of several fluid model determine which high-density cemented backfilling slurry is. The research based on round-pipe experiment data of resistance losses resistance losses, analysed the rheological properties of high-density cemented backfilling slurry and get experiential formulas through academic analysis.We get the formula for calculating times of line by analysing gravity flow system.These formulas were applied to feasibility study of mines gravity flow system.(5) Research of the classified tailings high-density backfilling slurry suggests that the slurry has good flow property, little bleeding and subsiding. It says that classified tailings with a suitable particles grade match can be applied to high density filling. In addition its transportation performance is not inferior the unclassified tailings and achieve better filling mass quality.(6) The article developly utilized software FLUENT to established model of a mine actual pipe systerm and to numerical damage simulate the high-density cemented backfilling slurry gravity flow in the pipe systerm. Simulation results show the pressure distribution and liquid status of pipe systerm, provide reference for optimization arrangement of pipline and system operation.