1、内蒙古科技大学毕业设计说明书 I 摘摘 要要 新建大华选矿厂处理原矿能力为 40 万吨，给矿粒度为 5000 毫米。 大华铁矿主要矿物中磁铁矿占 36.5%，赤铁矿占 2.79%，褐铁矿占 0.68%，黄铁矿占 0.15%，全矿区以磁铁矿为主，个别有极少量赤铁矿。脉石矿物占 59.88%，其中石英占 36.42，角闪石占 13.2%，辉石 7.36%，云母类 1.85%碳酸岩类 1.05%。选用阶段磨矿、 阶段选别流程。 工艺流程介绍如下：破碎为三段一闭路。磨矿为两段闭路磨矿，一段磨矿分级的溢 流给入一段大筒径磁选,粗精矿产物品位为 48.52%、产率为 53.58%、回收率为 89.58%；
2、 粗精矿给入浓缩磁选， 同时二段磨矿分级返砂给入浓缩磁选。 浓缩磁选产率为 131.46%。 二段分级溢流给入二段磁选，经磁选后，粗精矿的品位为 63.5%、产率为 39.26%，回收 率为 85.9%。二段磁选精矿接着给入三段小筒径，三段磁选精矿品位为 67%，产率为 36.88%，回收率 85.14%。三段磁选精矿经浓缩脱水得到最终精矿，品位为 67%、产率 为 36.88%、回收率为 85.14%。 选矿厂设计总投资为 1095.52 万元人民币，建设期为一年，设计服务年限为 15 年， 投资回收期 0.8 年。年精矿产量 14.75 万吨，按目前市场价格预计年销售收入 10325 万
3、元。 关键词：关键词：磁选；阶段磨矿；阶段选别 内蒙古科技大学毕业设计说明书 II ABSTRACT The newly-designed Da Hua mineral processing plant has a capacity of 40 thousands tons, in which the size is from 500 to 0 mm. In the mainly valuable mineral, magnetite is about 36.5%, hematite is 2.79%, limonite accounted 0.68%, pyrite is 0.15% , m
4、agnetite dominated the whole mining area, a very small amount of hematite individual mine. Gangue minerals accounted for 59.88%, which accounted for 36.42% of quartz, hornblende 13.2%, 7.36% pyroxene, mica 1.85%, 1.05% carbonate rocks.So stage-grinding and stage-concentration are employed. Technical flawsheet is introduced as following: crushing is carried out through three stages with one stage closed-circuit. Grinding is two stage closed-circuits, and the overflow of first classifier is given
