(1)对于一段分级溢流的选别，随起重砂时间间隔的延长，金富集比增大，回收率降低。在2～3 h之间，回收率在20%左右，富集比可达2 000以上。时间超过3 h，富集比不再增大，回收率有所下降。
(2)根据现场标定的流量，在给矿2 m3/h时，选别效果最好。富集比较大，回收率也较高。
(3)根据模拟多段选别的结果来看，选别段数以三段为佳;超过三段，回收率增加幅度不大，流程复杂。
1) for a period of separation of classification overflow, with the prolongation of time interval of placer gold enrichment ratio, recovery rate, reduce the. Between 2 and 3 h, the recovery rate is about 20%, and the enrichment ratio is more than 2000. Time more than 3 h, enrichment ratio is no longer increased, the recovery rate has declined.
(2)根据现场标定的流量，在给矿2 m3/h时，选别效果最好。富集比较大，回收率也较高。
(2) according to the field calibration of the flow, in the 2 m3/h to the mine, the best effect of the election. Enrichment is relatively large, the recovery rate is also higher.
(3)根据模拟多段选别的结果来看，选别段数以三段为佳;超过三段，回收率增加幅度不大，流程复杂。
(3) according to the simulation of multi segment selection of other results, the selection of the three paragraph is better; more than three, the recovery rate is not increased, the process is complex.
