In oxide mineral flotation, salicylhydroxamic acid (SHA) is a frequently employed collector renowned for its commendable selectivity. Nevertheless, SHA manifests an insufficient collecting efficacy in bastnaesite flotation. In response, the paper synthesized a novel collector, 5,5′-methylenedisalicylic acid (MDSA), by tethering two SHA molecules with a methylene group. In the flotation separation of bastnaesite and fluorite, MDSA collector exhibits an excellent selectivity. The synergistic application of MDSA collector and sodium alginate (SA) inhibitor effectively accomplishes the flotation separation of these two minerals. Zeta potential experiments and X-ray photoelectron spectroscopic tests consistently reveal that, with same MDSA doses in bastnaesite and fluorite slurries, MDSA possess heightened adsorption capacities on bastnaesite surface in contrast to fluorite. Consequently, in flotation experiments, the use of MDSA collector yields superior recoveries of bastnaesite compared to fluorite. Furthermore, the prior attachment of SA to fluorite interferes with the subsequent MDSA adsorption, whereas the initial SA binding to bastnaesite surface exerts a diminished influence on the subsequent adsorption of MDSA. First-principles calculations elucidate that MDSA can engage with two neighboring surface Ce3+ ions of bastnaesite through its two N-hydroxy amide groups, creating two pentacoordinate chelate rings and facilitating its adsorption onto bastnaesite surface. Furthermore, MDSA demonstrates a diminished adsorption energy on bastnaesite in contrast to fluorite.

中文翻译：

---

基于水杨异羟肟酸分子结构的氟碳铈矿 5,5′-亚甲基二水杨酸的新型浮选捕收剂的合成


在氧化物矿物浮选中，水杨基异羟肟酸 （SHA） 是一种经常使用的捕收剂，以其值得称道的选择性而闻名。然而，SHA 在氟碳铁矿浮选中表现出收集效率不足。作为回应，该论文通过将两个 SHA 分子与亚甲基拴合，合成了一种新的捕收剂 5,5′-亚甲基二水杨酸 （MDSA）。在氟碳铈矿和萤石的浮选分离中，MDSA 捕收剂表现出优异的选择性。MDSA 捕收剂和海藻酸钠 （SA） 抑制剂的协同应用有效地完成了这两种矿物的浮选分离。Zeta 电位实验和 X 射线光电子能谱测试一致表明，在氟碳铈矿和萤石浆料中具有相同 MDSA 剂量的情况下，与萤石相比，MDSA 在氟碳铈矿表面具有更高的吸附能力。因此，在浮选实验中，与萤石相比，使用 MDSA 捕收剂可产生更高的氟碳铈矿回收率。此外，SA 先前附着在萤石上会干扰随后的 MDSA 吸附，而初始 SA 与氟碳酸盐矿表面的结合对 MDSA 的后续吸附的影响减弱。第一性原理计算阐明了 MDSA 可以通过其两个 N-羟基酰胺基团与氟碳铈矿的两个相邻表面 Ce3+ 离子啃合，形成两个五配位螯合环并促进其吸附到氟碳铈矿表面。此外，与萤石相比，MDSA 在氟碳铈矿上的吸附能降低。