1、 I 摘摘 要要 孟家沟铁矿选矿厂年处理量为 40 万吨原矿，给矿粒度为 3000mm，选厂设 计为一次性平地建厂。 孟家沟铁矿主要矿物为磁铁矿，磁铁矿占 36.5%左右，采用单一磁选工艺， 磁铁矿粒度为 0.1 毫米左右， 选用阶段磨矿,阶段选别流程。 原矿品位为 21.96%。 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 51.00%，产率为 33.59%，回收率为 78.00%；粗选产品再经过浓缩磁选，产品品位为 53.90%，产 率为 60.62%，回收率为 148.80%；然后磁选产品再进入第二段磨矿，之后对细粒 磁铁矿进行第二段磁选；磁选产品品位为 57.7%，产率为
2、55.33%，回收率为 144.90%；第二段磁选产品再经细筛，精矿品位可达 62.1%，产率为 25.81%，回 收率为 73.00%，筛下产品经过第三段磁选，磁选产品品位为 63.4%，产率为 25.00%， 回收率为 72.2%； 第三段磁选产品再经第四段磁选， 精矿品位可达 64.8%， 回收率为 24.47%，产率为 72.2%；最后产品再经过磁重选别，精矿品味 66.5%， 产率为 23.11%，回收率为 80% 关键词： 选矿 磁选 阶段选别 阶段磨矿 Abstract Meng jia gous iron capacity for 40 million tons in ore-
3、dressing plant of ore, Feed size for 300 0mm, The factory is designed for one-time ground. Meng jia gous main mineral as magnetite iron, magnetite, using a single of 36.5% magnetic separation technology Magnetite granularity for 0.1 millimeter, choose stage II grinding, stage for process. For 21.96%
4、 ore grade. The first section ore grinding-classification process into the first section, overflow magnetic separation products, production rate for 51.00% grade for the recovery of 78.00%; 33.59%, Through concentrated roughers.tousegravity-flotation products, product grade 53.90% for separation, yield, 148.80% 60.62% for recovery, And then again in the second period of separation products for grinding and fine after the second period of separation, d
