端部放矿废石漏斗形成规律的实验研究

发布时间：2018-12-12 17:08

【摘要】：端部放矿崩落采矿法应用十分广泛,但是损失贫化大是其突出的缺点,如何降低损失贫化一直是采矿界研究的重点。以往的研究对象多是矿石放出体形态、结构参数和放矿管理,但是矿石损失贫化问题并没有得到很好的解决,放矿过程中,矿石是在废石包裹下放出的,废石的混入是造成矿石贫化的直接原因,有必要以废石为研究对象。本文以鞍钢集团矿业公司弓长岭矿业公司为工程背景,针对弓长岭井下铁矿损失贫化大的特点,对端部放矿废石移动规律进行了深入研究。端部放矿的废石混入情况非常复杂,来自顶部、正面、侧面三方面,放矿过程中,它们各自形成顶部、正面、侧面小漏斗,最终汇集成一个大漏斗。为了得到各方面的混入情况,本文提出采用拆分的方法研究各个小废石漏斗独立形成过程,采场结构参数对废石漏斗形成的影响最大,本文又进行了不同结构参数下废石漏斗形成规律的实验,得出以下结论:1、提出了废石漏斗形成过程的一种拆分实验研究方法;2、分别进行了大漏斗放矿和3次小漏斗拆分实验,通过对比,顶部、正面、侧面小漏斗废石混入总和与大漏斗内废石混入结果相符,验证了把大废石漏斗拆分成小废石漏斗的实验方法是合理的;3、在目前崩落采矿法采场结构参数情况下,正面废石最先到达放矿口,其次是侧面,最后是顶部。整个废石混入中,正面废石混入占绝大部分;4、采场结构参数中,崩矿步距直接影响正面废石混入,进路间距影响侧面废石混入,分段高度影响顶部废石的混入;5、目前大结构参数方法,高分段结构有利于延迟顶部废石的混入,大间距能够延迟侧面废石的混入,但由于崩矿步距的调整有限,正面废石提前混入,并提前击穿矿石流,大量的矿石都是以矿岩混杂的方式放出。因此,大结构参数在矿石损失贫化方面效果不佳。
[Abstract]:The end drawing caving mining method is widely used, but the great loss and dilution is its outstanding shortcoming. How to reduce the loss dilution is always the focus of the mining industry. In the past, most of the objects of study were the shape of ore release body, structural parameters and ore drawing management, but the problem of ore loss and dilution was not well solved. In the process of ore drawing, the ore was released under the wrap of waste rock. The mixing of waste rock is the direct cause of ore dilution, so it is necessary to take waste rock as the object of study. In this paper, based on the engineering background of Gongchangling Mining Company of Angang Group Mining Co., aiming at the characteristics of large loss and dilution of iron ore in Gongchangling mine, the moving law of end-drawing waste rock is studied in depth. The mixing of the waste rock in the end drawing is very complicated, which comes from the top, the front and the side. During the drawing process, they form the top, the front, the side of the small funnel, and finally assemble into a big funnel. In order to get the mixed situation of various aspects, this paper puts forward the separate method to study the independent formation process of each small waste rock funnel, and the stope structure parameters have the greatest influence on the formation of the waste rock funnel. In this paper, the formation law of waste rock funnel under different structural parameters is tested, and the following conclusions are drawn: 1. A split experimental study method for the formation process of waste rock funnel is proposed; 2. Large funnel drawing and three small funnel splitting experiments were carried out respectively. By comparison, the summation of small funnel waste rock at the top, front and side is consistent with the results of the large funnel waste rock mixing. It is proved that the experimental method of separating the large waste rock funnel into small waste rock funnel is reasonable. 3. At present, under the condition of caving mining stope structure parameters, the front waste rock reaches the ore drawing opening first, then the side, and finally the top. In the whole waste rock mixing, the front waste rock mixing accounts for the majority; 4, in the stope structure parameter, the caving distance directly affects the front waste rock mixing, the approach distance affects the side waste rock mixing, and the section height affects the top waste rock mixing; 5. At present, the large structure parameter method, the high section structure is advantageous to delay the top waste rock mixing, the large spacing can delay the side waste stone mixing, but because of the caving step adjustment, the front waste rock mixes in ahead of time, and breaks through the ore flow ahead of time, A great deal of ore is released in a mixture of ore and rock. Therefore, large structural parameters are not effective in ore loss and dilution.
【学位授予单位】：辽宁科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD853.36

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