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Tan Y.-Y.,University of Science and Technology Beijing | Du J.-H.,University of Science and Technology Beijing | Song W.-D.,University of Science and Technology Beijing | Yang L.-H.,University of Science and Technology Beijing | Mei L.-F.,Wuhan Iron and Steel Group Mining Co.
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2012

Taking the mining of the 2 # hanging wall ore in Daye Iron Mine by a filling method as an engineering background, the change of high-steep slope stability in the mining process was analyzed first in this paper. Then through using on-site monitoring together with similar material simulate experiments, the stress and displacement changing rules of rock pillars and surrounding rock were studied to discuss the effect of mining the hanging wall ore using the filling method on the surrounding rock stability. The results show that the average value of slope safety coefficient decreases from 1.274 to 1.005 after slope expansion and mining. This indicates that the slope stability is poor. Although the rock pillars and surrounding rock are stable currently, the existing mined-out areas must be filled to change the stress concentration state before the mining of pillar ore and the roof & floor ore. Source


Yang D.-W.,University of Science and Technology Beijing | Sun T.-C.,University of Science and Technology Beijing | Yang H.-F.,University of Science and Technology Beijing | Xu C.-Y.,University of Science and Technology Beijing | And 2 more authors.
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2010

Direct reduction-roasted products and final products after magnetic separation, which are reduced from high-phosphorus oolitic hematite in west Hubei Province of China by adding a dephosphorization agent, were investigated by XRD and SEM. The results show that the dephosphorization agent added in the reduction-roasting process can remove phosphorus and promote iron reduction. The dephosphorization agent not only transforms partial phosphorus ores into easy removed solvable phosphate but also breaks the oolitic structure, leading to an easy separation of iron from gangue after fine grinding and magnetic separation in order to remove phosphorus. The grade and recovery of iron also improve due to adding the dephosphorization agent. © Right. Source


Wu S.,University of Science and Technology Beijing | Song W.-D.,University of Science and Technology Beijing | Du J.-H.,University of Science and Technology Beijing | Zhang X.-C.,Wuhan Iron and Steel Group Mining Co. | Zhou J.-X.,Wuhan Iron and Steel Group Mining Co.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2013

Exploitation of hanging wall ore with filling method can not only recycle ore, but also avoid decline of the slope and control deformation of surrounding rock effectively. Based on the hanging wall ore mining by filling method of Daye Iron Mine, Cavity Monitoring System (CMS) is used in this paper to detect the original goaf of hanging wall ore. Then stress, displacement and plastic deformation of surrounding rock and open-pit slope in the processing of mining the hanging wall ore are analyzed by CMS and 3D mine-FLAC3D coupled method. The calculation results show that the surrounding rock and open-pit slope deformation can be controlled by filling the goaf effectively, so that the hanging wall ore can be mined safely. In the process of mining the hanging wall ore, monitoring network containing stress, fractures convergence and total station is established to monitor real-timely the displacement and stress changes of the surrounding rock, the pillar and the slope. The monitoring results are generally in agreement with the numerical simulation. Source

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