端部放矿崩落体陷落区深度对矿石损失贫化的影响

发布时间：2018-07-28 11:43

【摘要】：无底柱分段崩落法是一种结构参数简单、机械化程度高、生产能力大、成本低、安全性能好的采矿方法。在无底柱分段崩落法中,崩落体形态是影响放矿效果好坏的重要因素,崩落体陷落区深度是崩落体形态重要参数之一,但以往缺乏崩落体陷落区深度对降低矿石损失贫化的影响研究,因此该研究具有重要的意义。本文在文献综述的基础上,提出了崩落体陷落区深度对矿石损失贫化影响的问题。研制了端部放矿大比例尺模型,并制作配套的定位片以及带有编码的彩色标志性颗粒。确定了具体的实验方案,并进行了五组不同深度崩落体陷落区实验,每组实验都按照实验方案进行矿岩的装填,标志性颗粒的摆放,以及放矿实验。在放矿过程中,采集了分选的矿岩数据、回收的标志性颗粒并记录相应的编码及放出时间,并对五组实验组数据分别进行分析与处理。取得如下成果:1.研制端部放矿实验模型,并用该模型进行了实验。2.进行五组不同深度崩落体陷落区的实验,结果表明:在其它条件一定时,崩落体陷落区深度影响放出体的形成,对矿石损失贫化有较大影响,随着陷落区深度加深,矿石损失率加大,矿石贫化率的变化幅度不大。崩落体陷落区深度为Omm时,矿石损失率是29.73% ,贫化率是20.60% ,矿石损失率最小,贫化率相对较低。3.实验发现:在其它条件一定时,当截止品位为20%时,随着崩落体陷落区深度的变化,每组实验回收的纯矿石量是纯矿石阶段纯矿石量的约2倍。4.端部放矿时,陷落区极点位置越靠近流轴,极点下降速度、废石与矿石接触面的扩展速度以及矿石的贫化速度越快。5.通过最小二乘法和高斯消元法拟合矿石损失率q(%)、矿石贫化率ρ(%)与崩落体陷落区深度h(mm)的关系为:q =- 1× 10~(-7)h~4 - 7 × 10~(-6) h~3 - 0.0002h~2 + 0.1526h + 29.73ρ = -6× 10~(-7)h~4 - 0.0001h~3 + 0.0056h~2 - 0.0224h + 20.06
[Abstract]:Sublevel caving without bottom pillar is a kind of mining method with simple structure parameters, high mechanization, large production capacity, low cost and good safety performance. In the sublevel caving method without bottom pillar, the caving shape is an important factor affecting the drawing effect, and the depth of caving area is one of the important parameters of caving shape. However, the previous study on the influence of depth of caving area on ore loss and dilution is of great significance. On the basis of literature review, this paper puts forward the influence of the depth of caving area on ore loss and dilution. A large scale model of end drawing was developed, and the matching location sheet and coded color landmark particles were made. The specific experimental scheme was determined and five groups of experiments on caving areas with different depth were carried out. Each group of experiments carried out the filling of ore and rock the placing of symbolic particles and the ore drawing experiment according to the experimental scheme. In the process of ore drawing, the separated ore and rock data were collected, the symbolic particles were recovered, the corresponding coding and releasing time were recorded, and the data of the five experimental groups were analyzed and processed respectively. The results are as follows: 1. The end drawing experiment model was developed and the experiment was carried out with the model. The experiments of five groups of caving areas with different depth are carried out. The results show that the depth of caving area affects the formation of the releasing body and the ore loss and dilution, and the depth of the caving area deepens with the depth of the subsidence area. The ore loss rate increases and the ore dilution rate does not change much. When the depth of caving area is Omm, the ore loss rate is 29.73%, the dilution rate is 20.60%, the ore loss rate is the least, and the dilution rate is relatively low. It is found that when the cutoff grade is 20 and the depth of caving area changes, the amount of pure ore recovered in each group of experiments is about 2 times that of pure ore in the stage of pure ore. At the end of ore drawing, the closer the pole position is to the flow axis, the lower the pole is, the faster the expansion rate of the interface between the waste rock and the ore is, and the faster the dilution rate of the ore is .5. By least square method and Gao Si elimination method, the ore loss rate Q (%) is fitted. The relation between ore dilution rate 蟻 (%) and depth h (mm) of caving area is: 1 脳 10 ~ (-7) hau 4-7 脳 10 ~ (-6) hum 3-0.0002h~2 0.1526 h 29.73 蟻 = 6 脳 10 ~ (-7) 0.0001h~3 0.0056h~2 -0.0224 h 20.06
【学位授予单位】：辽宁科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD853.362

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