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根据空气重介干法选模型机分选试验结果，提出了分粒级产品预测法———不同粒级物料按相应的Ｅｐ值分别预测其数、质量，然后依据物料的粒度组成，综合得到最终产品数、质量指标．应用实例证明该方法能如实地反映实际分选效果，在重力选领域中具有普遍的实际意义．
According to the results of the test of air heavy medium dry separation machine, the forecasting method of classified product is put forward. According to the corresponding Ep value, the prediction of the number and quality of different grain size materials is carried out. Then, based on the granularity of the material, The final product number, quality indicators. The application example proves that this method can faithfully reflect the actual sorting effect and has universal practical significance in the gravity selection field.