This paper researched the enhanced flotation separation performance of ilmenite and titanaugite using the mixed collector benzhydroxamic acid/dodecylamine (BHA/DDA). The interface assembly mechanism was mainly investigated through in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy combined with the two-dimensional correlation spectroscopy (2D-COS) and X-ray photoelectron spectroscopy (XPS). It has been found that BHA/DDA mixed collectors successfully separate ilmenite from titanaugite at a molar ratio of 8:1. Zeta potential experiments suggested that, in the presence of mixed collector system, the BHA-DDA complex adsorbed on the ilmenite surface via the chemically adsorbed BHA and the electrostatically adsorbed DDA, however, the complex adsorbed on the surface of titanaugite unstably. According to in situ ATR-FTIR combined with 2D-COS and XPS results, the interface assembly mechanism of BHA/DDA is summarized as: the function group of BHA molecules first binds to the metal sites on minerals to form bidentate ligand, then DDA co-adsorbed with BHA on the surface of minerals through hydrogen bonding. DDA may change the adsorption modes of some BHA on the ilmenite surface from four-membered ring to five-membered ring, while the modes on the titanaugite surface is true opposite. Finally, recommended adsorption configurations of the BHA/DDA complex on the two mineral surfaces are proposed.

研究了苯异羟肟酸/十二胺混合捕收剂（BHA/DDA）对钛铁矿和钛辉石的强化浮选分离性能。主要通过原位衰减全反射傅里叶变换红外（ATR-FTIR）光谱结合二维相关光谱（2D-COS）和X射线光电子能谱（XPS）研究界面组装机制。已经发现，BHA/DDA 混合捕收剂以 8:1 的摩尔比成功地将钛铁矿与钛辉石分离。Zeta电位实验表明，在混合捕收剂体系存在下，BHA-DDA络合物通过化学吸附BHA和静电吸附DDA吸附在钛铁矿表面，而络合物在钛辉石表面的吸附不稳定。根据原位 ATR-FTIR 结合 2D-COS 和 XPS 结果，BHA/DDA 的界面组装机制概括为：BHA 分子的官能团首先与矿物上的金属位点结合形成双齿配体，然后 DDA 共- 通过氢键与矿物表面的 BHA 吸附。DDA 可能将一些 BHA 在钛铁矿表面的吸附模式从四元环改变为五元环，而钛金矿表面的模式正好相反。最后，提出了 BHA/DDA 复合物在两种矿物表面上的推荐吸附配置。然后DDA与BHA通过氢键共吸附在矿物表面。DDA 可能将一些 BHA 在钛铁矿表面的吸附模式从四元环改变为五元环，而钛金矿表面的模式正好相反。最后，提出了 BHA/DDA 复合物在两种矿物表面上的推荐吸附配置。然后DDA与BHA通过氢键共吸附在矿物表面。DDA可能将一些BHA在钛铁矿表面的吸附模式从四元环改变为五元环，而钛辉石表面的模式正好相反。最后，提出了 BHA/DDA 复合物在两种矿物表面上的推荐吸附配置。