1、 I 摘摘 要要 内蒙古黄岗矿业公司I区选矿厂年处理量为150万吨原矿， 给矿粒度为5000mm， 选厂设计为一次性平地建厂。 黄岗铁矿属于中硬度矿石，含泥量小，设计采用三段一闭路破碎流程；矿床中有 磁铁矿和锡矿等 29 种可利用元素。磁铁矿的粒度不均匀且较粗，约为 0.13.5mm， 所以设计采用阶段磨矿，阶段磁选工艺；第一段分级设计采用水力旋流器，第二段分 级设计采用高频细筛。原矿品位为 37.91%。矿石经第一段磨矿分级后，分级溢流进 入第一段磁选，磁选产品品位为 55.00%，产率为 55.95%，回收率为 79.80%；粗选产 品经过细筛和浓磁后进入第二段磨矿，细筛的筛下产品进入第二
2、段磁选，产品品位为 64.99%，回收率为 76.85%，产率为 41.42%；此时大量的尾矿被甩出，然后第二段磁 选产品再进入第三段磁选，磁选产品品位为 66%，回收率为 76.15%，产率为 40.42%； 精矿经浓磁过滤，含水率小于 10.21%。 关键词：选矿 磁选 精矿品位 阶段选别 II Abstract I Huanggang Mining District in Inner Mongolia concentrator with capacity of 1.8 million tons ore to the mine size is 500 0mm, designed as a
3、one-time flat concentrator plant. Huang Gang hardness of iron ore are in, with a small amount of clay, designed with three sections of a closed-circuit crushing process; deposits in magnetite and tin and other 29 kinds of available elements.Uneven and coarse grain size of magnetite is about 0.1 3.5m
4、m, so the design uses stage grinding, magnetic separation stage process; first paragraph of the hierarchical design using hydrocyclone, and the second design using high gradeFrequency fine sieve.Ore grade of 37.91%.The first paragraph of ore grinding and classification, the classification of overflow into the first paragraph of the magnetic separation, magnetic separation product grade of 55.00%, the yield was 55.95%, recovery was 79.80%; crude product through a fine sieve and selected
