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Han X.,Hebei United University | Han X.,Mining Development and Safety Technology Key Laboratory of Hebei Province | Li C.,Hebei United University | Li C.,Mining Development and Safety Technology Key Laboratory of Hebei Province | And 3 more authors.
Advanced Materials Research | Year: 2012

The mineral composition and microstructure of slag film of medium carbon steel are studied systematically with the methord of the technological mineralogy. The result shows that: The main mineral compositions of slag film are melilite and glass phase, and the texture of slag film is of two-layer or three, in which glassy-layer and crystallizing-layer appear alternately, the crystallization rate is from 2% to 5%. The melilite in slag film is good for improving lubrication and controlling heat transfer, so melilite can be promote in slag film for improving the quality of medium carbon steel. The slag film which take shape between the copp erplate of crystallizer and the solidified shell of casting blank can be divided into liquid and solid. The former is usually used to control lubrication of the casting blank while the solid is mainly used to control heat transfer. By means of controlling the structure of slag film, the rate of longitudinal crack in casting blank can be decreased[1, 2]. The technological mineralogy of slag film have been studied systematacially for improving the quality of casting blank of medium carbon. © (2012) Trans Tech Publications. Source


Wang Y.,China University of Mining and Technology | Zhang F.,China University of Mining and Technology | Yu J.,China University of Mining and Technology | Yang F.,Minmetals Hanxing Mining Co. | Cheng B.,China University of Mining and Technology
2011 International Conference on Multimedia Technology, ICMT 2011 | Year: 2011

complex coal mining economic research is an important factor for method determining. Based on the Muchenjian mine reverse "S" coal mining as the research object, we established different schemes of piecewise mining coal economic model of the 5# coal seam and analyzed the economic benefits of the different mining schemes. Considering the influence of the three main factors that coal production, the time value of money and the service life of mining equipment, on coal production cost of coal seam mining 5.Then we make economic benefit analysis and finally determine that we will adopt the pseudo sharp inclined section of flexible shield support mining method in heavy pitch section and tilt segment using prone pseudo inclined dense pillar mining method in inclined section. This conclusion of this paper may provide a new thought for the complex coal seam mining. © 2011 IEEE. Source


Liu Y.,Northeastern University China | Ren F.-Y.,Northeastern University China | Ding H.-X.,Northeastern University China | Song D.-L.,Northeastern University China | Kan J.-W.,Minmetals Hanxing Mining Co.
Gongcheng Kexue Xuebao/Chinese Journal of Engineering | Year: 2016

This article aims at caving corner residual orebody by trench bottom structure in Xishimen Iron Mine. SURPAC software was used to calculate the ore volume, amount of metal and grade. A mathematical model of multi-objective optimization was established to maximize the amount of metal and grade. According to the special situation of corner residual orebody mining, the amount of metal was selected to be the main object. SURPAC software was developed to automatically calculate by using TCL script. With the help of the script software, all factors in the constraint were tested. The optimum position of trench bottom structure was obtained, which is on the 103.1 m level and 18.65 m to the orebody. Compared with the original design, the amount of metal is increased by 27.79% after this optimal design. © All right reserved. Source


Qi J.D.,University of Science and Technology Beijing | Qi J.D.,Minmetals Hanxing Mining Co. | Wang P.,University of Science and Technology Beijing | Gao Y.T.,University of Science and Technology Beijing | Jiang Z.A.,University of Science and Technology Beijing
Applied Mechanics and Materials | Year: 2014

In order to make normal rock avalanche but not have significant impact on other parts of surrounding rock and produce evident deformation in the process of blasting heading, the basic mechanical property of rocks in Xishimen Iron Mine was taken as example to analyze. The process of coupling charge blasting in the surrounding holes of smooth blasting was simulated by applying the finite element numerical simulation software ANSYS/ LS-DYNA. The result shows that the surrounding rock has smallest stress and spall normally when borehole spacing of surrounding holes is 0.6m, thus boosting the efficiency of smooth blasting. © (2014) Trans Tech Publications, Switzerland. Source


Ding H.-X.,Northeastern University China | Ren F.-Y.,Northeastern University China | Liu Y.,Northeastern University China | Song D.-L.,Northeastern University China | And 2 more authors.
Gongcheng Kexue Xuebao/Chinese Journal of Engineering | Year: 2016

Because of the complexity of the residual orebody space form, the traditional cutting drawing method is difficult to show the orebody form intuitively and comprehensively, leading to difficulties in cutting engineering design, while SURPAC uses a 3D modeling method to solve this problem. An induced caving method of residual orebodies was investigated with Xishimen Iron Mine as the background. The trench's ore quantity, metal quantity and grade were calculated by SURPAC. The horizontal and vertical positions of a trench tunnel were taken as the optimization objects, and the trench tunnel in both directions was laid out by analyzing the critical caving span and the field engineering and technical conditions. According to the scope, a scheme of orthogonal test was designed. Taking extraction metal quantity and average grade as the assessment indexes, the range analysis and variance analysis of orthogonal test were conducted to obtain the position of a trench tunnel: double trench tunnels have a separation distance of 24 m, with a horizontal level of 118 m. Along with the scene implement, ideal test results have been achieved for refinement caving. © All right reserved. Source

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