5 结果和考察在用单一粒度玻璃球所进行的试验中,在任何条件下,在溜井内的整个区段,最外周的表观下降速度都比内侧部分的要慢。就整个趋势来说,在垂直溜井情况下,整个外周都平均约慢20%～25%左右。在斜溜井情况下,最外周的矿石中,底板侧矿石的表观下降速度有更慢的趋向。这种粒度比较均匀的玻璃球最外周的分离现象,是由于溜口和料斗部位的流动断面缩小引起的、对溜口上部的断面内表观下降速度分布的影响,只限于玻璃球水平方向的运动几乎完全受限制的最外周,并传到溜井上部而引起的。在玻璃球的粒度为 d、溜井内径为 D时,如果(d/D)~2值越大,则这一最外周部分在 5 Results and Inspections In the tests carried out with single-grain glass spheres, the apparent rate of decline of the outermost periphery was slower in all sections within the slipway under any conditions than in the inner part. As far as the whole trend is concerned, in the circumstance of vertical run-off, the entire periphery is about 20% ~ 25% slower on average. In the case of inclined chutes, the apparent rate of decline of the bedside ore tends to be slower in the outermost ores. The separation of the outermost periphery of the glass balls with a relatively uniform grain size is caused by the reduction of the flow cross section of the hopper and the hopper. The influence on the apparent rate of drop in the cross section of the upper portion of the hopper is limited to the horizontal The movement is almost completely restricted to the outermost circumference and is caused by the upper part of the runway. If the particle size of the glass spheres is d and the inner diameter of the slip well is D, the larger the value of (d / D) ~2, the outermost peripheral portion of