中文摘要：

随着入选铁矿石中菱铁矿含量的升高,东鞍山混磁精反浮选精矿铁品位和铁回收率均呈下降趋势.为了确保高菱铁矿矿石资源的顺利开发,并改善反浮选精矿指标,东北大学用新研制的改性脂肪酸类常温捕收剂DTX-1,对东鞍山混磁精进行了先正浮选菱铁矿、后反浮选石英等脉石矿物的分步浮选试验.结果表明,对东鞍山选矿厂混磁精进行1次开路正浮选菱铁矿,1粗1精2扫、中矿顺序返回闭路反浮选脱硅,最终可获得铁品位为65.87％、铁回收率为67.92％的铁精矿,与现场1粗1精3扫、中矿顺序返回闭路反浮选精矿指标比较,精矿铁品位和铁回收率分别提高了2.47和2.82个百分点,在工艺流程复杂性相当的情况下,产品指标得到了显著改善.

英文摘要：

With the increase of siderite content in raw iron ore,the iron grade and recovery of the reverse flotation con- centrate derived from Donganshan mixed magnetic concentrate was decreased. In order to well develop the high siderite iron ore resources,and improve the reverse flotation concentrate index, a new modification fatty acids collector DTX-1 synthesized by Northeastern University was used in stepped flotation of the mixed magnetic concentrate, Donganshan Dressing Plant, at room temperature, The results showed that mixed magnetic concentrate of Donganshan Dressing Plant, were treated by the closed-cir- cuit process of siderite concentration by one direct flotation, and desilication by reverse flotation of one roughing, one cleaning, two scavenging and middles back to the flow-sheet, iron concentrate with iron grade of 65.87% and recovery of 67.92% was a- chieved. Comparing with the concentrate index of on-site reverse flotation process of one roughing, one cleaning and three scav- enging, iron grade and recovery cff concentrate was increased by 2.47 and 2.82 percentage points respectively, iron concentrate index is improved remarkably with relative complex mineral processing operation.