分析了凹选二段分级中存在的问题，根据凹山矿石在磨碎过程中存在选择性这一特点，及直线振动筛工业试验情况，参照国内用例，提出了采用振动细筛代替螺旋分级机，尤其是采用高频振动细筛，技术比较成熟，筛孔尺寸有保证，建议开展进一步的研究。 According to the characteristics of Au ore in the grinding process and the industrial test of the linear shale shaker, with reference to the domestic use cases, the paper proposed the use of vibrating fine sieve to replace the spiral grader , Especially the use of high-frequency vibration fine sieve, the technology is more mature, mesh size is guaranteed, it is recommended to carry out further research.