偕氨肟捕收剂对石英和磁铁矿的浮选性能

采用羟胺法合成了3-十二烷基氨基丙偕氨肟（简称DAPA）作为铁矿反浮选捕收剂。通过单矿物浮选试验，考察了DAPA和十二胺对石英和磁铁矿的浮选特性，结果表明，在矿浆pH为4~6.5的条件下，DAPA捕收剂对石英的回收率可达到85%以上，同时在此条件下对磁铁矿的回收率均不超过20%，选择性能明显优于十二胺。用DAPA对石英和磁铁矿的人工混合矿进行反浮选，在不添加抑制剂的情况下，浮选精矿中TFe品位可达68.78%，可以应用于磁铁矿的脱硅浮选中。Zeta电位测试和红外光谱分析结果显示，DAPA在石英和磁铁矿表面的吸附主要为物理吸附。 

Study on the Flotation Performance of Quartz and Magnetite Using Amidoxime as Collector

3-(dodecylamino)-N'-hydroxypropanimidamide (DAPA) was synthesized using hydroxylamine method as a reverse flotation collector for iron ore. Micro-flotation tests were employed to detect quartz and magnetite minerals' flotation behaviors using DAPA and lauryl amine as collectors. The results showed that regulating the pulp pH as 5~6.5, DAPA collector could recover more than 85% of quartz and less than 20% of magnetite, the selectivity was obviously better than dodecylamine. The reverse flotation tests on the artificial mixed ores of quartz and magnetite were made, enhancing the grades of iron to 68.78% without any other reagents added. It could be used in desiliconization flotation of magnetite. The Zeta potential measurements and infrared spectroscopy results showed that DAPA adsorption on quartz and magnetite surface is mainly physical absorption.