崩落矿岩散粒体流动性能试验研究

Experimental research on granular flow characters of caved ore and rock

崩落矿岩散粒体的流动性能对于降低损失贫化具有重要的意义。分析了影响散粒体流动性能的因素,采用标志颗粒法进行了崩落矿岩散粒体流动性能试验,主要考虑的因素有放矿口大小、散体颗粒的粒径以及不同的散体材料。试验内容有放矿口大小与散体移动带试验;不同散体粒径与散体移动带试验、不同散体材料与散体移动带试验;平面和立体模型时放矿口尺寸对放出量影响试验;散体堆积高度与散体移动带试验。研究结果表明,(1)移动边界与散体的材料、颗粒的尺寸大小、放矿口大小等因素有关,而散体堆积高度对其影响不大;(2)散体的流动速度与散体颗粒的大小和放矿口尺寸有关。根据所得试验结果,提出了采矿设计参数的确定方法。

The flow characters of caved ore and rock is important for reducing ore lose and ore dilution. Firstly, the effected reasons of flow characters for caved ore and rock are analyzed. Secondly, experiments are carried out to study the granular flow characters considering the size of drawing hole, size of grain and type of material by index grain method. The relationship among the moving border, size of drawing hole, size of grain, type of grain and the height of grain is studied. The relationship between the size of drawing hole and the released quantity is studied by plane pattern and stereo pattern. The main experimental results are as follows： （1） the moving border is related with the size of grain, size of drawing hole and type of material. However, the piling height of grain has little effect on the moving border; （2） the flow speed of grain is effected by size of grain and size of drawing hole. Based on the experimental results, a method of determining the mining design parameters is put forward.