This study evaluated the effects of collector type amide-amine compared with those of conventional etheramine acetate (both cationic collectors) on the surface properties of quartz and hematite. An examination of certain properties of the reagents indicated that the new collector amide-amine has CMC (critical micelle concentration) and pKa values (100 mg/L and 8.2, respectively) significantly lower than those of etheramine (800 mg/L and 9.4, respectively). Microflotation tests showed that the recoveries of quartz with amide-amine in all the concentrations tested were higher than those with etheramine. This is attributed to its lower CMC and pKa values. The selectivity window between quartz and hematite flotation using amide-amine was higher at pH 10.5 (approximately 80% for 5 mg/L). Therefore, the use of starch is not necessary in siliceous itabirite flotation by amide–amine collector. Zeta potential measurements and infrared spectra reveal that the adsorption of amide-amine collector on quartz surface occurs mainly by electrostatic attraction. Considering the better collectability of amide-amine for quartz flotation and lower adsorption affinity for hematite surface than etheramine, the amide-amine is a promising collector to be used in reversal iron ore flotation.

本研究评估了酰胺胺类捕收剂与常规醋酸醚胺（均为阳离子捕收剂）相比对石英和赤铁矿表面性质的影响。对试剂某些特性的检查表明，新型捕收剂酰胺胺的 CMC（临界胶束浓度）和 pKa 值（分别为 100 mg/L 和 8.2）显着低于醚胺（800 mg/L 和 9.4，分别）。微浮选试验表明，在所有测试浓度下，含有酰胺胺的石英的回收率均高于含有醚胺的回收率。这归因于其较低的 CMC 和 pKa 值。使用酰胺胺进行石英和赤铁矿浮选的选择性窗口在 pH 10.5 时更高（5 mg/L 约为 80%）。所以，酰胺-胺捕收剂在硅质板石浮选中不需要使用淀粉。Zeta 电位测量和红外光谱表明，酰胺-胺收集器在石英表面的吸附主要通过静电引力发生。考虑到酰胺胺比醚胺对石英浮选具有更好的捕收性和对赤铁矿表面的吸附亲和力更低，酰胺胺是一种很有前途的捕收剂，可用于铁矿石逆浮选。