The microflotation experiments were systematically carried out to investigate the inhibitory effect of citric acid (CA) on the flotation behavior of hornblende and magnesite. When the mixture consisted of sodium oleate and dodecyl phosphate was utilized as a mixed trapping reagent, CA could obviously inhibit the hornblende flotation but had little inhibitory effect on magnesite flotation. The desilication of magnesite flotation was accomplished when CA was employed as the hornblende inhibitor. Moreover, to reveal the adsorption mechanism of CA on the surfaces of hornblende and magnesite, a series of surface analysis techniques, such as X-ray photoelectron spectroscopy (XPS), zeta potential and Fourier transform infrared spectroscopy (FTIR), were conducted. Based on the zeta-potential and FTIR analyses, it is revealed that CA or CA together with collector (sodium oleate and dodecyl phosphate mixture) was applicable for the magnesite flotation tests. In the meanwhile, the introduced CA had obviously hindered the adsorption of sodium oleate and dodecyl phosphate mixtures on the hornblende surface, resulting in a significant difference in the flotation performance of hornblende and magnesite minerals. Moreover, XPS measurements revealed that the strong adsorption of CA on the hornblende surface can be ascribed to its affinity for the negative electron groups of CA and Ca ions.

中文翻译：

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添加柠檬酸作为抑制剂提高了角闪石和菱镁矿的浮选分离效率

系统地进行了微浮选实验，研究了柠檬酸（CA）对角闪石和菱镁矿浮选行为的抑制作用。当油酸钠和磷酸十二烷基酯的混合物作为混合捕集剂时，CA对角闪石浮选有明显抑制作用，但对菱镁矿浮选的抑制作用不大。当使用CA作为角闪石抑制剂时，完成了菱镁矿浮选的脱硅。此外，为了揭示 CA 在角闪石和菱镁矿表面的吸附机理，进行了一系列表面分析技术，如 X 射线光电子能谱 (XPS)、zeta 电位和傅里叶变换红外光谱 (FTIR)。基于 zeta 电位和 FTIR 分析，结果表明，CA 或 CA 与捕收剂（油酸钠和十二烷基磷酸酯混合物）适用于菱镁矿浮选试验。同时，CA的引入明显阻碍了油酸钠和十二烷基磷酸盐混合物在角闪石表面的吸附，导致角闪石和菱镁矿矿物的浮选性能存在显着差异。此外，XPS 测量表明 CA 在角闪石表面的强吸附可归因于其对 CA 和 Ca 离子的负电子基团的亲和力。导致角闪石和菱镁矿的浮选性能存在显着差异。此外，XPS 测量表明 CA 在角闪石表面的强吸附可归因于其对 CA 和 Ca 离子的负电子基团的亲和力。导致角闪石和菱镁矿的浮选性能存在显着差异。此外，XPS 测量表明 CA 在角闪石表面的强吸附可归因于其对 CA 和 Ca 离子的负电子基团的亲和力。