金堆城钼业汝阳有限责任公司选矿厂有2台2FG-20型分级机,单重42.41t,长11.7 m,宽4.4m。自投产以来,螺旋上部返砂大量堆积,严重时漫过上沿,造成支架弯曲与断裂,大小叶片磨损严重,电机超负荷运行。返砂不畅又影响球磨机磨矿效率,影响生产任务的完成。1 改造方案鉴于该厂2FLG-1500型分级机返砂沟坡度较大,砂子流动顺畅,最终确定将2FG-20型分级机返砂沟提高300 mm,以增加返砂沟坡度,解决返砂不畅带来 Jinduicheng Molybdenum Ruyang Co., Ltd. concentrator has 2 2FG-20 classifier, single weight 42.41t, length 11.7 m, width 4.4m. Since put into production, a large number of spiral back to a large pile of sand, diffuse along the edge of the serious, resulting in stent bending and fracture, the size of the blade wear and tear, the motor overload operation. Poor return of sand also affect ball mill grinding efficiency, affecting the completion of production tasks. 1 Reconstruction Scheme Given 2FLG-1500 classifier grading sand back slope larger, smooth sand flow, and ultimately determine the 2FG-20 classifier sand return ditch increased by 300 mm, in order to increase the return sand ditch gradient to solve the sand is not Cheong brings