Study On High Efficient Mining Technologies Of Loufan Ximihe Iron Mine

Loufan Ximihe iron ore is sedimentary-metamorphic iron ore deposits of Anshan type, the deposit is hosted in the sedimentary strata of the upper part of Luliang group Yuanjia village. The mining area distributes Ⅰ# and Ⅱ# two orebodies. The orebodies, as stratiform and stratoid, the thickness 5-20m, and the dip 30°～55。.The mine utilizes sublevel caving method, as the surface loess mix in the overburden and the mining plan is not suited to the conditions of ore-rock stability. The production emerge many technical problems, for example, frequent activities of stope ground pressure, low ore recovery rate, large loess mix in the ore, low stope production capacity and output connection difficulties, in addition the mine also has the problem of crushing plant press mine. These problems seriously restrict the mining production smoothly. Therefore, with application of northeastern university "three laws" (ground pressure law, the rock mass caving rule and the bulk flow rule) adaptive efficiency mining theory. This article according to ground conditions and production status study improvement scheme of mining method, and technical measures of safety production, which forming the efficient mining techniques of Ximihe iron ore.On the basis of studying the orebody mining conditions and ore-bearing rock properties, we conduct the stability classification and caving analysis. According to determining the sectional size of roadway reasonably, we control the activities of stope ground pressure; according to monitoring the surface fracture line, we determine the move time of the crushing station, and solve the problem of crushing plant pressure mine reasonably; according to arranging reasonable blast holes, we process the mined-out area of the end of 1544m level segmentation crossheading, and induce the roof rock of empty area caving as soon as possible to ensure the safe production of mines. Meanwhile, according to the ore body morphology and distribution conditions of loess, we put forward the upper and lower districts synchronization mining plan along the tilt direction of the ore body. Upper mining area by improving stope mining order to improve ore production; under mining area according to controlling the induction area and the order of ore removal to ensure ore down evenly, and citing the waste stone of the roof forming overburden to control the mixed loess and reduce ore loss and dilution. In addition, we take measures to speed up the mining preparation process of under sublevel, and stope more work surface at the same time, which improving the comprehensive production capacity of the mine.The analysis shows that, under current conditions of Loufan Ximihe iron ore, the mining plan can effectively control the stope ground pressure and the mixed surface loess, thus these can significantly reduce ore loss and dilution, increase the ability of mine production, and achieve the expected target of efficient exploitation.