论文部分内容阅读
溜井系统的矿石混合特性,对质量管理;特别是对于在溜井系统中进行配矿的石灰石矿,具有重大意义。在本研究中,用玻璃球(作为大矿块)和特殊溜井系统的按比例缩小的模型,进行了旨在弄清矿石混合机理及其特性的试验。特别是在垂直溜井系统中,矿石的混合,除在周边之外,主要是在漏斗流区发生。由于玻璃球的咬合效应的加强,在溜井部分的这一漏斗流区,料流开始转为漏斗流,并变得较长,这将促进混合。根据假设的漏斗流区的表观下降速度区而计算出的混合特性曲线与试验结果非常一致。在试验时未能再现真实溜井系统中经常出现的断续重力流动,所以,未能见到斜溜井中由于断续流动的作用而引起的特殊混合。尽管如此,矿石在斜溜井内的混合被促进的程度仍然稍大于垂直溜井的混合。
Ore mixing characteristics of the chute system are of great importance to quality management, especially for limestone mines that are allocated to the chute system. In this study, a test was conducted to clarify the ore mixing mechanism and its characteristics using a scaled-down model of glass spheres (as large nuggets) and special slip-on systems. Especially in the vertical run-of-mine system, ore mixing takes place mainly in the funnel flow area, except at the periphery. Due to the bling effect of the glass bulb, in this funnel flow section of the runway section, the flow begins to turn into a funnel flow and becomes longer, which will promote mixing. The calculated mixing characteristic curve based on the hypothetical zone of apparent rate of decline of the funnel flow zone is in good agreement with the experimental results. The intermittent gravity flow, which often occurs in the real chute system, was not reproduced at the time of the test and, as a result, no special mixing due to the intermittent flow was found in the inclined chute. In spite of this, the mix of ores in inclined sloping wells is still promoted to a slightly greater extent than that of vertical slides.