柔性隔离层下多漏斗矿岩流动特性及影响因素正交模拟试验
发布时间：2019-02-28 17:00
【摘要】：研究散粒体的流动性能及其影响因素对于降低损失和贫化具有重要的意义.借鉴前人研究成果,选择了隔离层厚度、隔离层界面摩擦系数、颗粒摩擦系数、颗粒半径、墙体摩擦系数5项主要影响因素,采用正交实验法。建立了五因素三水平正交放矿数值模型;通过对多漏斗放矿条件下矿岩流动规律的模拟,探讨了柔性隔离层作用下多漏斗放矿流动特性;结合多漏斗放矿试验特点,选取放出量与放出体交线高度比与隔离层起伏角为评价指标.利用矩阵分析法,获取指标体系的权矩阵,阐明了影响因素作用规律.研究结果表明:多漏斗放矿条件下,因各放矿口间的相互影响而产生交错、缺失等不同程度的变异,放出体并不呈规则椭球体形状;隔离层界面在放矿初期呈近似水平下移,后期弯曲起伏较大,呈圆弧形下移,直至放矿终了以波浪形悬浮于底部结构;隔离层运动形态对放矿效果的影响起着至关重要的作用;5项主要因素影响的主次顺序是墙体摩擦系数、颗粒摩擦系数、颗粒半径、界面摩擦系数、隔离层厚度;当墙体摩擦系数为0.2、颗粒摩擦系数为0.8、颗粒半径为0.008m、界面摩擦系数为0.8、厚度为0.005 m时,放矿效果最佳.
[Abstract]:It is of great significance to study the flow performance of bulk particles and its influencing factors for reducing loss and dilution. Referring to the previous research results, the orthogonal experiment method was adopted to select five main influencing factors, such as the thickness of the isolation layer, the friction coefficient of the interface of the isolation layer, the radius of the particle and the friction coefficient of the wall. The numerical model of five-factor and three-level orthogonal drawing is established, and the flow characteristics of multi-funnel drawing under the action of flexible isolation layer are discussed by simulating the ore-rock flow law under the condition of multi-funnel drawing. Combined with the characteristics of multi-funnel drawing test, the ratio of drawing volume to drawing line height and the angle of isolation layer fluctuation are selected as the evaluation index. By using the matrix analysis method, the weight matrix of the index system is obtained, and the action rule of the influencing factors is clarified. The results show that under the condition of multi-funnel drawing, the drawing body does not show regular ellipsoid shape because of the interlaced and missing variation of each ore drawing mouth. The boundary of isolation layer moves down approximately horizontally at the initial stage of ore drawing, and the bending fluctuation is large at the later stage, and moves downward in a circular arc until the end of drawing with wave shape suspended on the bottom structure, and the movement form of the isolation layer plays an important role in the effect of ore drawing. The primary and secondary order of the five main factors are wall friction coefficient, particle radius, interfacial friction coefficient and thickness of isolation layer. When the wall friction coefficient is 0.2, the particle friction coefficient is 0.8, the particle radius is 0.008m, the interfacial friction coefficient is 0.8and the thickness is 0.005 m, the drawing effect is the best.
【作者单位】： 广西大学资源与冶金学院;北京科技大学土木与环境工程学院;
【基金】：国家自然科学基金(批准号:51464005)资助项目
【分类号】：TD801
本文编号：2431982
[Abstract]:It is of great significance to study the flow performance of bulk particles and its influencing factors for reducing loss and dilution. Referring to the previous research results, the orthogonal experiment method was adopted to select five main influencing factors, such as the thickness of the isolation layer, the friction coefficient of the interface of the isolation layer, the radius of the particle and the friction coefficient of the wall. The numerical model of five-factor and three-level orthogonal drawing is established, and the flow characteristics of multi-funnel drawing under the action of flexible isolation layer are discussed by simulating the ore-rock flow law under the condition of multi-funnel drawing. Combined with the characteristics of multi-funnel drawing test, the ratio of drawing volume to drawing line height and the angle of isolation layer fluctuation are selected as the evaluation index. By using the matrix analysis method, the weight matrix of the index system is obtained, and the action rule of the influencing factors is clarified. The results show that under the condition of multi-funnel drawing, the drawing body does not show regular ellipsoid shape because of the interlaced and missing variation of each ore drawing mouth. The boundary of isolation layer moves down approximately horizontally at the initial stage of ore drawing, and the bending fluctuation is large at the later stage, and moves downward in a circular arc until the end of drawing with wave shape suspended on the bottom structure, and the movement form of the isolation layer plays an important role in the effect of ore drawing. The primary and secondary order of the five main factors are wall friction coefficient, particle radius, interfacial friction coefficient and thickness of isolation layer. When the wall friction coefficient is 0.2, the particle friction coefficient is 0.8, the particle radius is 0.008m, the interfacial friction coefficient is 0.8and the thickness is 0.005 m, the drawing effect is the best.
【作者单位】： 广西大学资源与冶金学院;北京科技大学土木与环境工程学院;
【基金】：国家自然科学基金(批准号:51464005)资助项目
【分类号】：TD801
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1 林学良,龙子平;四角田矿试用石膏隔离层防灭火[J];煤矿安全;1989年03期
，本文编号：2431982
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