无底柱分段崩落法放出体形态的研究
发布时间：2018-11-28 13:09
【摘要】：无底柱分段崩落法以其安全高效和成本较低的特点,在国内外地下矿山开采中应用广泛。无底柱分段崩落法回采系统中,放出体、松动体、崩落体三个不同形体相互制约,对损失贫化指标产生较大影响。因此研究不同崩落体形态下放出体的形态,对提高矿石回收率和矿山经济效益有着重要的理论意义和实际价值。在总结前人研究成果的基础上,结合眼前山铁矿应用无底柱分段崩落法开采的现状,采用理论分析、计算机模拟和实验室实验等手段,对不同崩落体形态下放出体的形态进行了研究,取得了以下成果:1、通过对眼前山铁矿无底柱分段崩落法放矿的数值模拟,为实验室实验提供了指导作用;通过实验室放矿实验,分析了放出矿石量、岩石量随着出矿次数的变化规律,求出了每组实验的矿石贫化率和回收率,利用标志性颗粒和放出散体圈出了出放出体的形态。2、运用ANSYS软件进行了不同崩落体形态的放矿模拟试验,直观再现了无底柱分段崩落法的放矿过程和崩落体内不同位置的颗粒的移动过程,统计分析了不同崩落体形态下放矿过程中颗粒的移动规律。3、不同崩落体形态模型下实验室放矿实验结果表明:随着出矿次数的增加,在达到一定次数之后,矿石开始贫化,而且,随着出矿次数的继续增加,矿石贫化率不断增加,矿岩的混杂也越明显。4、实验证明放矿过程中放出体形态开始时呈现上部小、下部大的形态,随着放矿的进行,放出体形态的逐渐变宽,但是上部变宽的速度明显大于下部变宽的速度,放出体形态最宽的位置由下部逐渐移动到上部,随后放出体的形态呈现出上部大、下部小的形态。5、通过用放出的矿石和标志性颗粒恢复不同崩落体形态放矿过程中放出体形态变化图,得出第二组实验的放出体形态与崩落体形态比较接近的结论。在无贫化放矿条件下,矿石回收率达到52.20%,截止放矿时,矿石的回收率达到了78.28%,为寻找最佳崩落体形态和优化崩落体结构参数提供了依据。
[Abstract]:Sublevel caving without bottom pillar is widely used in underground mining at home and abroad because of its safety, efficiency and low cost. In the stoping system of sublevel caving method with no bottom pillar, three different bodies, I. e., releasing body, loose body and caving body, restrict each other, which have great influence on the index of loss and dilution. Therefore, it is of great theoretical significance and practical value to study the forms of the caving body in different caving and falling forms to improve the ore recovery rate and the economic benefit of the mine. On the basis of summing up the previous research results, combined with the present situation of the application of sublevel caving method without bottom pillar in Qianshan Iron Mine, theoretical analysis, computer simulation and laboratory experiments are adopted. The following results are obtained: 1. Through the numerical simulation of sublevel caving of Qianshan Iron Mine without bottom pillar, this paper provides guidance for laboratory experiment; Through laboratory ore drawing experiment, the rule of ore quantity and rock quantity varying with the number of ore drawing are analyzed, the ore dilution rate and recovery rate of each group of experiments are calculated, and the shape of exfoliation is obtained by means of symbolic particles and exhumation particles. 2. The drawing process of sublevel caving method without bottom pillar and the moving process of particles in different positions of caving body were visualized by using ANSYS software. The rule of particle movement in the process of ore dispersal with different caving forms is analyzed statistically. 3. The results of laboratory drawing experiments under different caving shape models show that with the increase of ore drawing times, the ore begins to be depleted after a certain number of times. Moreover, with the increase of ore drawing times, the ore dilution rate increases continuously, and the mixing of ore rocks becomes more obvious. 4. Experimental results show that in the process of ore drawing, the shape of the drawing body is small in the upper part and large in the lower part, and with the ore drawing going on, However, the velocity of the upper part becoming wider is obviously larger than that of the lower part. The widest position of the releasing body is gradually moved from the lower part to the upper part, and then the exfoliating body appears to be larger in the upper part and smaller in the lower part. Based on the recovery of the drawing patterns of different caving bodies by using the ores and the typical particles, the conclusion of the second group of experiments is that the shape of the caving body is close to that of the caving body. Under the condition of no dilution drawing, the ore recovery reaches 52.20, and the ore recovery reaches 78.28 at the end of drawing, which provides the basis for finding the best caving shape and optimizing the caving structure parameters.
【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】：TD853.362
本文编号：2362910
[Abstract]:Sublevel caving without bottom pillar is widely used in underground mining at home and abroad because of its safety, efficiency and low cost. In the stoping system of sublevel caving method with no bottom pillar, three different bodies, I. e., releasing body, loose body and caving body, restrict each other, which have great influence on the index of loss and dilution. Therefore, it is of great theoretical significance and practical value to study the forms of the caving body in different caving and falling forms to improve the ore recovery rate and the economic benefit of the mine. On the basis of summing up the previous research results, combined with the present situation of the application of sublevel caving method without bottom pillar in Qianshan Iron Mine, theoretical analysis, computer simulation and laboratory experiments are adopted. The following results are obtained: 1. Through the numerical simulation of sublevel caving of Qianshan Iron Mine without bottom pillar, this paper provides guidance for laboratory experiment; Through laboratory ore drawing experiment, the rule of ore quantity and rock quantity varying with the number of ore drawing are analyzed, the ore dilution rate and recovery rate of each group of experiments are calculated, and the shape of exfoliation is obtained by means of symbolic particles and exhumation particles. 2. The drawing process of sublevel caving method without bottom pillar and the moving process of particles in different positions of caving body were visualized by using ANSYS software. The rule of particle movement in the process of ore dispersal with different caving forms is analyzed statistically. 3. The results of laboratory drawing experiments under different caving shape models show that with the increase of ore drawing times, the ore begins to be depleted after a certain number of times. Moreover, with the increase of ore drawing times, the ore dilution rate increases continuously, and the mixing of ore rocks becomes more obvious. 4. Experimental results show that in the process of ore drawing, the shape of the drawing body is small in the upper part and large in the lower part, and with the ore drawing going on, However, the velocity of the upper part becoming wider is obviously larger than that of the lower part. The widest position of the releasing body is gradually moved from the lower part to the upper part, and then the exfoliating body appears to be larger in the upper part and smaller in the lower part. Based on the recovery of the drawing patterns of different caving bodies by using the ores and the typical particles, the conclusion of the second group of experiments is that the shape of the caving body is close to that of the caving body. Under the condition of no dilution drawing, the ore recovery reaches 52.20, and the ore recovery reaches 78.28 at the end of drawing, which provides the basis for finding the best caving shape and optimizing the caving structure parameters.
【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】：TD853.362
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