1、内蒙古科技大学毕业设计说明书 I 大杨庄选矿厂年处理量为 40 万吨原矿，给矿粒度为 5000mm，选厂设计 为一次性平地建厂。 大杨庄铁矿属于中硬度矿石，含泥量小，采用三段一闭路破碎流程；主要 有用矿物是磁铁矿，且粒度不均匀，细粒选别粒度为 0.2mm，采用阶段磨矿， 阶段磁选工艺。原矿品位为 29.07%。矿石经第一段磨矿分级溢流进入第一段磁 选，磁选产品品位为 45.8%，产率为 55.62%，回收率为 89.92%；粗选产品再经 过地二段磁选，产品品位为 49.50%，回收率为 218.98%，产率为 128.60%；此 时大量的尾矿被甩出，然后第二段磁选产品再进入第二段磨矿，之后对细
2、粒磁 铁矿进行选别；磨矿产品经过细筛选别，筛下产品品位为 52.79%，产率为 48.60%， 回收率为 88.26%； 筛下产品经过第三段磁选， 磁选产品品位为 64.00%， 回收率为 85.84%，产率为 38.99%；第三段磁选产品再经第四段磁选，精矿品位 可达 68.00%，回收率为 85%，产率为 36.34%，精矿经过滤机过滤，含水率小于 10%。 关键词：选矿 磁选 精矿品位 阶段选别 内蒙古科技大学毕业设计说明书 II Abstract The capacity of the Dayangzhuang dressing plant is 400,000t/a,the plan
3、t is going to be built on the ground which is filt and is put up at one time. The Dayangzhuang iron ore is the medium degree of hardness and contains little slime, so we choose the three section of closed crushing circults; Consideration of the mainly valuable mineral is magnetite and the size of ma
4、gnetite particles are not average ,we adopted stage grinding and magnetic separation technology. The grade of run-of-mine ore is29.07%. The overflow product of the first classifier is given into the first magnetic and the degree of the product of the first magnetic separator is 45.8%, product ratio is 55.62% and recovery of concentrate is 89.92%; Then the concentrate is given into the magnetic separator and the degree,the product ratio and the recovery of concentrate of its are 49.50%,218.98%,1
