结果表明：再磨后的一段精矿经磁筛精选，最终精矿铁品位未能提高；
The results showed that: the final concentrate did not be improved after crude concentrate was screened by magnetic screening;
探索大石河选厂在生产流程的基础上，应用螺旋溜槽，获取粗磨后最终精矿的可能性。
Based on the processing flow of Dashihe separation mill, using spiral sluice, the possibility of obtaining final concentrate under coarse primary grinding is searched for.
采用组合磨矿的闭路试验得到最终精矿品位为20.14%，回收率为78.98%。
The concentrate grade was 20.14% with the recovery of 78.98%.
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