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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.
Studying the flow properties of granular materials and their influencing factors are of great significance to reduce the loss and depletion.Considering the research results of predecessors, the thickness of the separator, the interface friction coefficient, particle friction coefficient, particle radius, wall friction Factor 5 main influencing factors, using orthogonal experiment. A numerical model of orthogonal ore-dressing with five factors and three levels was set up. Through the simulation of ore flow under multi-funnel-draining conditions, the flow characteristics of multi-funnel draining by flexible isolation was discussed. Combined with the characteristics of multi-funnel- Taking the height of the line of intersection between the release volume and the discharge body and the separation angle of the release layer as the evaluation indexes, the weight matrix of the index system is obtained by the matrix analysis method, and the action law of the influencing factors is clarified.The results show that: The interaction between the ore mouth to produce staggered, missing and other varying degrees of variation, release body does not appear to be a regular ellipsoid shape; isolation layer interface in the early stage of ore mining was approximately level down, the latter part of the larger bending undulating, round Arc until the end of the ore-shaped wave suspended in the bottom of the structure; isolation layer movement shape play an important role in the impact of the ore-dressing effect; the order of the five main factors affecting the primary friction coefficient is the wall, Particle friction coefficient, particle radius, interface friction coefficient and barrier layer thickness; when the friction coefficient of the wall is 0.2, the friction coefficient of the particles is 0.8, the particle radius is 0.008m, the interface friction coefficient is 0.8 , The thickness of 0.005 m, the best ore beneficiation.