Surface modification of ilmenite with sodium persulfate and its effect on flotation performance

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2024-10-05 DOI:10.1016/j.apsusc.2024.161354

Chuan Dai, Hao He, Pan Chen, Yaohui Yang, Jihua Zhai, Wei Sun

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Abstract

Ilmenite is a challenging mineral to float, making the improvement of its floatability a prominent research focus. This study proposes a novel surface modification method using sodium persulfate (Na₂S₂O₈) activation in the sodium oleate system for ilmenite. The activation mechanism was investigated using micro-flotation, zeta potential analysis, adsorption measurement, contact angle measurement, Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), flotation kinetics calculation, and thermodynamic analysis. Flotation tests demonstrated a significant increase in ilmenite recovery after Na₂S₂O₈ activation under weakly acidic conditions, particularly at pH 4.0, where recovery increased from 12.41 % to 67.24 %. Zeta potential, contact angle, and adsorption tests revealed that Na₂S₂O₈ activation positively shifted the surface potential of ilmenite, enhancing sodium oleate adsorption and increasing hydrophobicity. FT-IR, XPS, and thermodynamic analyses showed that Na₂S₂O₈ facilitated the conversion of Fe²⁺ to Fe³⁺ on the ilmenite surface, Additionally, activation with sodium persulfate increased the Fe³⁺ content on the surface from 20.13 % to 43.50 %, leading to the formation of a more stable ferric iron oleate. AFM scans confirmed that Na₂S₂O₈ activation significantly increased the area and thickness of sodium oleate adsorbed on the ilmenite surface compared to unactivated ilmenite.

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过硫酸钠对钛铁矿的表面改性及其对浮选性能的影响

钛铁矿是一种难以浮选的矿物，因此改善其可浮性成为研究的重点。本研究提出了一种在油酸钠体系中使用过硫酸钠（Na2S2O8）活化钛铁矿的新型表面改性方法。采用微浮选、ZETA电位分析、吸附测量、接触角测量、傅立叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）、原子力显微镜（AFM）、浮选动力学计算和热力学分析等方法对活化机理进行了研究。浮选试验表明，在弱酸性条件下，特别是在 pH 值为 4.0 时，Na2S2O8 活化后钛铁矿的回收率显著提高，回收率从 12.41% 提高到 67.24%。Zeta电位、接触角和吸附测试表明，Na2S2O8活化可使钛铁矿的表面电位发生正向移动，从而增强油酸钠的吸附性并增加疏水性。傅立叶变换红外光谱、XPS 和热力学分析表明，Na2S2O8 促进了钛铁矿表面的 Fe2+ 向 Fe3+ 的转化，此外，用过硫酸钠活化后，表面的 Fe3+ 含量从 20.13% 增加到 43.50%，从而形成了更稳定的油酸铁。原子力显微镜扫描证实，与未活化的钛铁矿相比，Na2S2O8 活化显著增加了油酸钠在钛铁矿表面的吸附面积和厚度。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.