中文摘要：

辽宁某开采深度为1400 m的深部铁矿石铁品位为37．03%，铁主要以磁性铁及赤褐铁矿的形式存在，分布率分别为72．83%、22．52%，硫、磷等有害元素含量很低。为开发利用该矿石，对其进行了弱磁选—强磁选—混磁精矿反浮选工艺研究。结果表明：矿样磨细至-0．043 mm占75%后，经1段弱磁选—2段强磁选，可得到铁品位47．50%、回收率95．01%的混磁精矿；混磁精矿再磨至-0．038 mm占95%后，以淀粉为抑制剂、RS-3为捕收剂、经1粗1精2扫阳离子反浮选流程处理，可获得铁品位67．21%、回收率85．03%的精矿产品。采用磁选—反浮选流程处理该深部铁矿石获得了较为理想的选别指标，对类似复杂难选深部铁矿石选矿具有借鉴意义。

英文摘要：

There is 37. 03% Fe in a deep iron ore with depth of 1 400 m in Liaoning. Iron mainly exists in form of mag-netite and hematite-limonite,with distribution rate of 72. 83% and 22. 52% respectively. The content of harmful elements such as sulfur,phosphorus is very low. Beneficiation experiments of low intensity magnetic separation（ LIMS）-high intensity magnet-ic separation（ HIMS）-reverse flotation on mixed magnetic iron concentrate were applied for exploitation and utilization of the ore. The results indicated that,at the grinding fineness of 75% passing 0. 043 mm,via once LIMS and twice HIMS,mixed mag-netic concentrate with iron grade of 47. 05% and recovery of 95. 01% is obtained. Iron concentrate with iron grade of 67. 21%and recovery of 85. 03% is obtained after ground the mixed magnetic concentrate to 95% passing 0. 038 mm and then endure one roughing-one cleaning-two scavenging flotation process,using starch as depressor and RS-3 as collector. By magnetic and reverse flotation separation technology to deal with the deep iron ore can achieve relative ideal separation indexes,and can pro-vide significant reference for the separation of similar refractory deep iron ore.