The usage of synergic reagents plays vital role in the effective flotation of phosphate ore. In this paper, the adsorption mechanism of synergic reagents and its effect on apatite flotation in oleamide-sodium dodecyl benzene sulfonate (SDBS) system were investigated via micro-flotation experiment, Zeta-potential determination, X-ray photo-electron spectroscopy (XPS), and Time-of-flight secondary ion mass spectrometry (ToF-SIMS). Experimental research represented that a highest recovery rate of 97.09% could be obtained when a mixed collector dosage of 4 × 10⁻⁴ mol/L was used with a molar ratio of oleamide to SDBS of 2:1 at pH = 9.0, and the recovery could be improved by ~4.87% comparing with the theoretical recovery rate of single collector. Results of Zeta potential and XPS indicated that the chemisorptions of C₁₇H₃₃CONH⁻, (C₁₇H₃₃CONH₂)_m and sulfonate species originated from the mixed collector onto apatite surfaces occurred. More importantly, the adsorption of amide could be reinforced in the presence of SDBS, and the N atomic concentration increased from 1.23% to 1.66%. The results of ToF-SIMS further confirmed that the normalized peak intensities of C₄H₅⁺ and C₄H₇⁺ for apatite-oleamide-SDBS sample showed a statistically increase comparing with corresponding results of apatite-oleamide sample, while the normalized peak intensities of C₆H₄⁺ presented an opposite trend comparing with that of apatite-SDBS sample. The whole thickness of the formed hydrophobic species on the apatite surfaces was approximately 40.29 nm. The synergistic effects of mixed collector were mainly attributed to the improvement of solubility and dispersion and the decrease in critical micelle concentration of oleamide in the presence of SDBS, which provided easy access to the interaction between C₁₇H₃₃CONH⁻, (C₁₇H₃₃CONH₂)_m and apatite surfaces. The results provided a new path for apatite flotation, and reinforced the theoretical basis for flotation technique of phosphate ore.

增效剂的使用对磷矿的有效浮选起着至关重要的作用。本文通过微浮选实验、Zeta电位测定、X射线光电子能谱(XPS)研究了油酰胺-十二烷基苯磺酸钠(SDBS)体系中增效剂的吸附机理及其对磷灰石浮选的影响。和飞行时间二次离子质谱（ToF-SIMS）。实验研究表明，当混合捕收剂用量为 4 × 10 ^-4时，回收率最高可达 97.09%。使用mol/L，油酰胺与SDBS的摩尔比为2:1，pH=9.0，与单捕收剂的理论回收率相比，回收率可提高~4.87%。Zeta电位和XPS的结果表明，C ₁₇ H ₃₃ CONH ^-、(C ₁₇ H ₃₃ CONH ₂ ) _m和源自混合捕收剂的磺酸盐物质在磷灰石表面发生了化学吸附。更重要的是，在 SDBS 的存在下可以增强酰胺的吸附，并且 N 原子浓度从 1.23% 增加到 1.66%。ToF-SIMS 的结果进一步证实了 C ₄ H ₅ ⁺的归一化峰强度和磷灰石-油酰胺-SDBS样品的C ₄ H ₇ ⁺与磷灰石-油酰胺样品的相应结果相比显示出统计学上的增加，而C ₆ H ₄ ⁺的归一化峰强度与磷灰石-SDBS样品的归一化峰强度相反. 在磷灰石表面形成的疏水物质的总厚度约为 40.29 nm。混合捕收剂的协同效应主要归因于在 SDBS 存在下溶解度和分散性的提高以及油酰胺临界胶束浓度的降低，这为 C ₁₇ H ₃₃ CONH ^-之间的相互作用提供了容易的途径，（C₁₇ H ₃₃ CONH ₂ ) _m和磷灰石表面。研究结果为磷灰石浮选提供了一条新途径，巩固了磷矿浮选技术的理论基础。