中文摘要：

DL-1为东北大学新研制的阴离子反浮选捕收剂,为了检验其性能及效果,以齐大山铁矿选矿厂铁品位为46.02％的混磁精为试样进行了反浮选试验,并借助Zeta电位检测和红外光谱分析手段对DL-1反浮选石英的机理进行了探讨.结果表明：①以DL-1为捕收剂,采用1粗1扫、中矿返回闭路流程常温反浮选试验试样,获得了铁品位为65.38％、铁回收率为89.56％的铁精矿;DL-1对温度变化的适应能力较强,且可在CaCl2用量较低的情况下高效捕收试样中的石英.②在pH =9～ 12的碱性水溶液中,石英与DL-1间存在静电斥力,CaCl2对石英活化后可大大削弱这种静电斥力;在pH =9～ 11.45的矿浆中,被Ca2＋活化的石英与DL-1间既可能发生静电吸附也可能发生化学吸附,而在pH＞ 11.45的矿浆中,被Ca2活化的石英对DL-1有强烈的静电吸引,因而比在pH=9 ～11.45区间可以更好地完成对石英的吸附和捕收.③在pH=11.50时,DL-1与石英表面同时存在物理吸附、氢键及化学吸附,因而DL-1对无Ca2活化的石英也有很好的捕收效果.

英文摘要：

DL-1 is a newly anionic reverse flotation collector developed by Northeastern University.In order to test the floating properties,mixed magnetic concentrate from Qidashan Dressing Plant with Fe grade of 46.02％ was used to make reverse flotation tests,and the mechanism in quartz reverse flotation by DL-1 is discussed with Zeta potential measurement and infrared spectrum analysis.The results showed that：①Iron concentrate with Fe grade of 65.38％,recovery of 89.56％ was obtained through closed-circuit reverse flotation flowsheet of one roughing,one scavenging,and middles back to the flowsheet in turn with normal temperature and DL-1 as collector; DL-1 can endure temperature changes,and high efficiently collecting quartz at a lower dosage of CaC12.②There are electrostatic repulsion between quartz and DL-1 with pH of 9 ～ 12 in aqueous alkaline solution,and can be weakened by activation of CaCl2 to quartz; electrostatic/chemical adsorption may occur between quartz activated by Ca2＋ and DL-1 with pH of 9 ～ 11.45,there are strong electrostatic attraction of quartz activated by Ca2＋ to DL-1 with pH ＞ 11.45,therefore DL-1 can well adsorb and collect quartz at pH range of 9 ～ 11.45.③There are physical adsorption,hydrogen bond and chemical adsorption coexist between DL-1 and quartz surface with pH of 11.45,DL-1 can also well collect quartz without Ca2＋ activation.