The collecting performances of N-dodecylethylene-diamine (ND) to quartz and hematite were studied via single mineral flotation. Experimental results show that ND has stronger collecting ability to quartz than hematite. Different floatability of quartz and hematite was presented in the existence of depressant. Compared with lauryl amine, ND has stronger collecting performances to quartz. Satisfied separation result of artificially mixed sample was acquired with iron grade of concentrate of 59.92% and iron recovery of 88.85% when pulp pH value was 7.27 with 41.7 mg/L collector and 3.33 mg/L starch. Polar group properties calculation results indicated that ND has stronger collecting capability and better selectivity than lauryl amine. Measurement results of zeta-potentials and infrared spectrum showed that hydrogen bonding adsorption and electrostatic adsorption occur between the surface of ND and quartz.%通过单矿物实验考察N-十二烷基乙二胺(ND)对石英和赤铁矿的捕收能力.结果表明,ND对石英具有很强的捕收能力,而对赤铁矿的捕收能力较弱.在抑制剂存在的情况下,石英和赤铁矿体现出不同的浮游特性.与十二胺相比,ND对石英具有更强的捕收能力.人工混合矿分选实验结果表明,在矿浆pH值为7.27、捕收剂用量为41.7 mg/L、抑制剂用量为3.33 mg/L时取得较好的分选效果,此时精矿中的铁品位为59.92%、铁回收率为88.85%.极性基团性能计算结果表明,与十二胺相比,ND具有更强的捕收能力和更好的选择性.Zeta电位测试和红外光谱分析结果表明,ND与石英表面发生静电和氢键吸附.
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