Dongxiang Copper deep cemented filling system to carry the parameter optimization study
|School||Jiangxi University of Technology|
|Keywords||pipeline transportation two-phase flow resistance loss critical velocity CFD simulation|
Dongxiang Copper Mine plans to expand production by exploiting the deep ore bodies. Due to the original design of gravity pipeline system only took the need of filling -75m level above mined-out area into account, with the continuous extension of deep mining, the filling system is also exposed some problems, such as the low concentration of slurry transport, the large discharge of underground water, the long filling pipe, the big filling times-lane, more accident of pipe blocking, so study on the optimization of Dongxiang Copper Mine filling system is very necessary.On the basis of research methods in the field of on-the-spot investigation, theoretical analysis, laboratory test and numeral simulation analysis, combined with pipeline transportation theory, the theoretical calculation and numeral simulation analysis is conducted at the pipe gravity stability in Dongxiang Copper Mine. And this paper makes some studies on the deep cemented backfilling system of Dongxiang Copper Mine, which can provide a guiding role for high effectiveness and the safety production. The research contents and results of this thesis are as follows:First, study on the theory of slurry pipeline transportation. Basically involve the two-phase flow resistance calculation and project characteristics on pipeline transportation.Second, this paper measured the hydraulic gradient parameters that impact slurry pipeline transportation. The experiment contents including tailings proportion,tailings volume weight,tailings porosity and the of composition particles size and the critical velocity sedimentation experimentThird, local industrial experiments research high concentration slurry pipeline transportation. The earth’s surface simulated experiment through four concentrations (65.5%, 68.5%, 71.5% and 74.5%) paste, and find out it can be gravity at current maximum filling times-lane similitude standards, without additional pump.Fourth, this paper makes theory calculation in the pipeline slurry hydraulic gradient. Through a large number of the empirical equations before, and combined with the case of slurry in Dongxiang Copper Mine, this paper chooses empirical equations, for example Jinchuan equations and Changsha Institute of Mining Research equations, to check pipeline gravity. And find that slurry can be gravity without additional pump when this mine does the paste filling.Fifth,this paper made ANSYS FLOTRAN CFD simulation from the two parts of concentration and flow rate. And found that the concentration of slurry from 68.5% to 71.5% was much suitable to transport in pipeline, the variation of flow velocity had much effect on hydraulic gradient. So recommend that the mine should transport slurry at a low flow velocity in the condition of promising the filling amounts and gravity.