This study synthesized a novel amine collector, 1-(dodecylamino)-2-propanol (DDAIP), by incorporating a 2-hydroxy propyl group into the molecular structure of dodecylamine (DDA). Flotation experiments showed that utilizing DDAIP collector resulted in a substantial difference of ∼80% in flotation recoveries between apatite and quartz. Employing DDA as the collector yielded a difference of ∼30% in flotation recoveries between the two minerals. DDAIP demonstrated a superior selectivity in the reverse flotation separation of apatite and quartz in comparison to DDA. Zeta potential experiments indicated that, under identical dosages, DDAIP demonstrated increased adsorption capacities on quartz surface in contrast to DDA, whereas the adsorption amounts on apatite surface remained similar for both the collectors. By combining XPS analysis and first-principles calculations, DDAIP demonstrated enhanced chemical interactions with the Si atoms on quartz surface and a greater number of hydrogen bonds with quartz surface compared to DDA. The presence of an isopropyl group between the hydroxyl and secondary amine groups in DDAIP molecular structure leads to steric hindrance, hindering the simultaneous chemical interactions of the O and N atoms in DDAIP with the Ca ions on apatite surface. Thus, the incorporation of the 2-hydroxy propyl group into DDAIP molecular structure does not enhance its adsorption strength on apatite surface when compared to DDA.

中文翻译：

---

新型胺类捕收剂1-(十二烷基氨基)-2-丙醇在磷灰石与石英反浮选分离中的应用

本研究通过在十二胺（DDA）的分子结构中引入2-羟基丙基，合成了一种新型胺捕收剂1-（十二胺）-2-丙醇（DDAIP）。浮选实验表明，使用 DDAIP 捕收剂可使磷灰石和石英的浮选回收率相差约 80%。使用 DDA 作为捕收剂，两种矿物的浮选回收率相差约 30%。与 DDA 相比，DDAIP 在磷灰石和石英的反浮选分离中表现出优异的选择性。 Zeta 电位实验表明，在相同剂量下，与 DDA 相比，DDAIP 在石英表面的吸附能力有所增加，而两种捕收剂在磷灰石表面的吸附量保持相似。通过结合 XPS 分析和第一性原理计算，与 DDA 相比，DDAIP 证明了与石英表面 Si 原子的化学相互作用增强，并且与石英表面的氢键数量更多。 DDAIP 分子结构中羟基和仲胺基之间存在异丙基会导致空间位阻，阻碍 DDAIP 中的 O 和 N 原子与磷灰石表面的 Ca 离子同时发生化学相互作用。因此，与DDA相比，将2-羟基丙基引入DDAIP分子结构并不会增强其在磷灰石表面的吸附强度。