细粒级即翡翠粒度粗细等级中的第二级，该级别的翡翠特点为放大镜下能看到硬玉颗粒和翠性，较透明至半透明，颗粒直径小于1MM。
... petroleum fraction 石油馏分 light fraction 轻馏分 ; 光分数 fine fraction 细粒级 ; 细颗粒部分 ...
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微细粒级的样品(2毫米)在玛瑙研钵中呈细粉末状。
The finer fraction (2 mm) of the samples was finely powdered in an agate mortar.
离心力场强化了细粒级的选择性矿化，加快了浮选速度。
The selective mineralization for fine particles is strengthened in the centrifugal force field, resulting in a faster floatation speed.
细粒级尾砂絮凝沉降性能是全尾砂充填应用中的核心问题之一。
The flocculating settling characteristics of fine tailings is one of the key problems in application of filling by all tailings.
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