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本文报道了－10μm颗粒逆流分级的研究结果。设计并制造了两类分级机：一类是半连续式，另一类为连续式。最新的样机在给矿体积浓度30％时，经连续运转细粒回收率达到90％，分级精度X25／X75达到0.83没有旁路，分离粒度可达1．4μm（根据分级效率曲线X50）。
This paper reports the results of the countercurrent fractionation of -10 μm particles. Two types of graders are designed and manufactured: one is semi-continuous and the other is continuous. The latest prototype achieves a 90% recovery of fines by continuous operation at 30% of the ore volume concentration, a classification accuracy of X25 / X75 of 0.83 and a bypass particle size of up to 1.4 μm (based on the classification efficiency curve X50).