半自磨机排料分级是提高选矿厂磨矿效率的重要环节。青海某金矿半自磨机排料采用直线振动筛分级，由于直线振动筛故障率高，选厂设备运转率低，严重影响生产稳定运行。通过将直线振动筛改为圆筒筛分级后，设备运转率提高1%，选矿成本每年节约10万元。研究结果表明：在半自磨机分级设备中，圆筒筛能达到与直线振动筛同样的分级效果；与直线振动筛相比，圆筒筛具有低能耗、低成本、结构简单及维修方便等优点，从而大大降低了工人的劳动强度和设备检修时间，提高了选矿厂设备运转率。本次改造对整个选矿厂工艺指标的提升具有重要意义。

The SAG（semi-autogenous） mill discharge grading is an important link in improving grinding efficiency of concentrator.The Straight-line vibrating screen classification was used in the SAG mill discharge grading of  a gold mine in Qinghai Province，this serious influenced the stability of the production run，due to the high failure rate of linear vibrating screen，low mill plant operation rate.By changing the linear vibrating screen to cylinder sieve classification，equipment operation rate increased by 1%，beneficiation cost savings of nearly 100 000 yuan.The results show that the trommel screen can achieve the same effect as the linear vibrating screen in the grading equipment of the semi-autogenous mill.Compared with the linear vibrating screen，the trommel screen has the advantages of low energy consumption，low cost，simple structure and convenient maintenance.Thus greatly reducing the labor intensity and equipment maintenance time，improve the dressing plant equipment operation rate.The transformation of the beneficiation plant to enhance the process indicators has the vital significance.