Abstract: The  overflow discharge of spiral classifier is changed to be bilateral discharging from the traditional front-end approach, forming a  spiral classifier with bilateral discharging.Then this new spiral classifier was used to carry out the pilot plant classification tests on one-grinding products of a sulfide ore, and compared with the traditional spiral classifier.The results showed that under different feed concentration, gradient of spiral classifier and feed flow rate, the efficiency of the bilateral spiral classifier reached up to 52.21%~73.06%.Comparing with the traditional classification of spiral classifier, its classification efficiency can be improved by at least 5.77%, and at most 17.74%.

Key words: Spiral classifier, Overflow discharge, Bilateral discharge, Classification efficiency