粗粒级，翡翠粒度等级的第四级，也是最差的一级。
铁矿石则表现为辐照后粗粒级产率明显降低。
For iron ore, the yield of coarse fraction was obviously reduced after irradiation.
本文通过对分级试验数据的分析，指出混杂作用对粗粒级的影响是不可忽略的。
In this paper, it is pointed out that the effects of entrainment on coarse particle size are not neglected through analysis of data of classification tests.
铜矿含矿信息的直接指示元素倾向于向两极富集，即富集于最粗粒级和最细粒级。
Direction elements of including Cu ore information tend to concentrate in coarse and fine fractions.
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