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针对姑山选厂二段分级效率低的问题，介绍了采用螺旋分级机———高频细筛串联分级和用高频细筛代替螺旋分级机两种工艺的试验情况。
Aiming at the problem of low grade efficiency in the second section of Gushan Concentrator, this paper introduces the experiments of spiral classifier --- high frequency fine sieve series classification and high frequency fine sieve instead of spiral classifier.