中文摘要：

为提高司家营研山铁矿阴离子反浮选精矿指标，并解决原捕收剂需加温浮选的问题，用东北大学新研制的常温捕收剂DMP-1对现场混合磁选精矿进行了选矿试验。结果表明：在试验确定的工艺条件下，采用1粗1精3扫、中矿顺序返回流程处理铁品位为39．05％的现场混合磁选精矿，最终获得了铁品位为64．65％、铁回收率为78．64％的铁精矿；新型捕收剂DMP-1对浮选温度变化有较强的适应能力，即使在14℃下经1粗1精开路反浮选，仍可获得铁品位62．13％、铁回收率为60．60％的铁精矿。试验产品的XRD、SEM分析表明：新型捕收剂DMP-1对石英、白云石等脉石矿物有较强的选择性捕收效果；吸附在较粗大铁矿物颗粒表面的细小石英因没有得到有效分散，最终随铁矿物一起被抑制是造成精矿铁品位有待进一步提高的主要原因；细小铁矿物颗粒因吸附在较粗大脉石矿物表面而上浮，或以铁矿物贫连生体形式而上浮是造成金属流失的主要原因。

英文摘要：

Beneficiation experiments of on-site mixed magnetic concentrate by using a new type of collector DMP-1 at normal temperature was conducted, in order to improve the concentrate of reverse flotation indices from Sijiaying-Yanshan plant, and solve the problems of original collector requires warming in flotation. The results showed that, iron concentrate with iron grade of 64.65% and iron recovery of 78.64% was finally achieved by dealing with the on-site mixed magnetic concen- trate with iron grade of 39.05%, through the process, derived from experiments, of single-stage roughing, single-stage cleaning and three-stage scavenging,and middles back to the flow-sheet in turn. The new type of collector DMP-1 well adapted to tem- perature variations ,and iron concentrate with iron grade of 62.13% ,iron recovery of 60.60% was also achieved even at tem- perature 14 ~C by single-stage roughing and single-stage cleaning open circuit reverse flotation process. X-ray diffraction （XRD） and scanning electron microscope （SEM） analysis showed that DMP-1 had good selective floating performance to quartz, dolomite and the like gangue minerals. That fine quartz particles, adsorbed and covered on relatively big iron particles, could not effectively dispersed and was depressed accompanying with iron minerals, is the main reason for relatively low grade of iron concentrate. Fine iron particles float by adsorbed and covered on relatively bigger gangue particles or in form of barren associated particles is the main reason for loss of iron.