重选分配曲线广泛地用于选煤作业的分析。由于选煤时的分选比重较低,因而有多种廉价的重液可供分析时选用。然而当分选比重较高的矿物时,可采用的重液往往有毒,且很昂贵。另外,采用重液分析还存在其他方面的不足。首先是难以从大量的矿石中取得具有代表性的矿样。由于矿样必须达到统计学上要求的数量,因此当具有关键比重的那部分矿粒含量较低时,需要的试样量必须,很大,这给分析带来很大困难,有时甚至无 Reselection distribution curve is widely used in coal preparation operations analysis. Due to the lower proportion of sorting when selecting coal, a variety of cheap heavy liquids are available for analysis. However, heavy fluids that can be used are often toxic and expensive when sorting minerals of higher specific gravity. In addition, the use of heavy liquid analysis there are other deficiencies. The first is that it is difficult to obtain representative mineral samples from a large number of ores. Since the number of ore samples must meet the statically required quantity, when the content of the part of the ore with the critical mass is relatively low, the amount of sample required must be large enough to cause great difficulties in the analysis, sometimes not even