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重选可选性研究工作,通常是从研究有用矿物在不同粒级,不同比重部分中的分布特性入手,并据此判断可能的入选粒度和分选指标。但是,分离不同比重组分的重液分离法(浮沉试验),需要一套不同比重的重液或重悬浮液,尤其是由于常用的重液价格通常较高,且常有毒性或带腐蚀性,而当试料粒度较粗时需用的重液数量又很大,故其应用受到限制。另外,
Reselection selectivity studies usually start with the study of the distribution characteristics of useful minerals at different grain sizes and different proportions and determine the possible selected grain sizes and sorting indices. However, heavy liquid separation (floatation test), which separates fractions of different specific gravity, requires a different set of heavy or resuspension fluids, especially since commonly used heavy fluids are generally expensive and often toxic or corrosive , And when the sample size is coarse, the amount of heavy liquid required is very large, so its application is limited. In addition,