Abstract In this paper, tetrasodium glutamate diacetate (TGD) was applied as a depressant for cationic direct flotation separation of specularite and chlorite. The depression performance of TGD was compared with starch via microflotation experiments. The adsorption mechanism of TGD onto chlorite surface were investigated by surface charge measurements, fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculation. The microflotation results indicated that, compared with starch, TGD exhibited better depression performance with chlorite recovery of 16.73% and specularite recovery of 92.41% at pH 10. The mechanistic study demonstrated that TGD mainly chemisorbed on chlorite surface by O Mg and bonds, from which O Mg bonds were created preferentially. TGD could be an efficient depressant of chlorite in the specularite/chlorite separation.

中文翻译：

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了解谷氨酸四钠二乙酸钠对镜面岩和绿泥石分离的差异抑制：实验和 DFT 研究

摘要 本文以谷氨酸四钠二乙酸钠（TGD）为抑制剂，用于阳离子直接浮​​选分离镜砂和绿泥石。通过微浮选实验将TGD的抑制性能与淀粉进行了比较。通过表面电荷测量、傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）和密度泛函理论（DFT）计算研究了TGD在亚氯酸盐表面的吸附机理。微浮选结果表明，与淀粉相比，TGD 表现出更好的抑制性能，在 pH 10 时，绿泥石回收率为 16.73%，镜面石回收率为 92.41%。机理研究表明，TGD 主要通过 O Mg 和键化学吸附在绿泥石表面，其中优先产生 O Mg 键。