Abstract The crystal chemistry and the flotation behavior of ilmenite and titanaugite using sodium oleate collector were investigated. The substitution of Fe3+ and Mg2+ in the crystal structure of ilmenite was identified by X-ray diffraction, scanning electron microscopy/energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy (XPS) analyses; Ti4+ was replaced by Fe3+, and Fe2+ was substituted by Mg2+. The crystal structure of titanaugite consisted of Ca, Mg, Fe, and Ti species. The micro-flotation results showed that ilmenite and titanaugite exhibited good floatability at pH 5.0–8.0, but they had no significant difference. The NaOL adsorption on the ilmenite surface was similar to that of titanaugite at pH 6.0. The results of zeta potential and Fourier-transform infrared spectroscopy analyses indicated that NaOL chemisorbed on the surfaces of ilmenite and titanaugite. The XPS analyses demonstrated that NaOL reacted with Fe and Mg, resulting in ilmenite flotation, whereas NaOL interacted with Fe, Ca, and Mg on the titanaugite surface. The similarity of surface active sites between ilmenite and titanaugite resulted in the non-selective adsorption of NaOL, and the actual mineral flotation obtained only a 42.86% TiO2 grade with 59.79% recovery.

中文翻译：

---

油酸钠对钛铁矿和钛辉石的浮选行为及机理研究

摘要 研究了油酸钠捕收剂对钛铁矿和钛辉石的晶体化学和浮选行为。通过X射线衍射、扫描电子显微镜/能量色散X射线光谱和X射线光电子能谱（XPS）分析确定钛铁矿晶体结构中Fe3+和Mg2+的取代；Ti4+被Fe3+取代，Fe2+被Mg2+取代。钛辉石的晶体结构由 Ca、Mg、Fe 和 Ti 物种组成。微浮选结果表明，钛铁矿和钛辉石在 pH 5.0-8.0 时表现出良好的可浮性，但两者无显着差异。钛铁矿表面的 NaOL 吸附与 pH 为 6.0 的钛辉石相似。Zeta电位和傅里叶变换红外光谱分析结果表明NaOL化学吸附在钛铁矿和钛辉石表面。XPS 分析表明 NaOL 与 Fe 和 Mg 反应，导致钛铁矿浮选，而 NaOL 与钛辉石表面上的 Fe、Ca 和 Mg 相互作用。钛铁矿和钛辉石表面活性位点的相似性导致 NaOL 的非选择性吸附，实际浮选仅获得 42.86% 的 TiO2 品位，回收率为 59.79%。