Zinc oxide ore containing smithsonite is a refractory ore, and it is difficult to separate smithsonite and calcite with traditional flotation collectors. A new collector was developed in this study, the multiligand biodegradable biosurfactant sodium myristoyl glutamate (SMG), which used calcium lignosulfonate (CLS) as a calcite depressant for the flotation of smithsonite. Microflotation experiments showed that SMG was an effective smithsonite flotation collector, with a recovery of more than 95 % after it reached a specific concentration. Adding CLS could achieve a considerable difference in flotation recovery rates between smithsonite and calcite. Adsorption of the collector on the mineral surface was analyzed. The contact angle, zeta potential, Fourier transform infrared (FTIR) spectra, X-ray photoelectron spectra (XPS), and atomic force microscopy (AFM) results confirmed that SMG was strongly adsorbed on smithsonite. Moreover, the depressant CLS was strongly adsorbed on the surface of calcite, and less was adsorbed on the surface of smithsonite. Density functional theory (DFT) calculations confirmed that the amino group in SMG promoted the binding of adjacent carboxyl groups to metal sites on the mineral surface. These results indicated that SMG, which is a biodegradable biosurfactant, is a promising collector for the selective recovery of smithsonite from calcite through flotation.

中文翻译：

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用于菱锌矿浮选的绿色多配体捕收剂肉豆蔻酰谷氨酸钠

含菱锌矿的氧化锌矿石是一种难选矿石，用传统的浮选捕收剂很难将菱锌矿和方解石分离。本研究开发了一种新的捕收剂，即多配体可生物降解的生物表面活性剂肉豆蔻酰谷氨酸钠（SMG），它使用木质素磺酸钙（CLS）作为菱锌矿浮选的方解石抑制剂。微浮选实验表明，SMG是一种有效的菱锌矿浮选捕收剂，达到特定浓度后回收率可达95%以上。添加 CLS 可以使菱锌矿和方解石之间的浮选回收率产生显着差异。分析了捕收剂在矿物表面的吸附情况。接触角、zeta 电位、傅里叶变换红外 (FTIR) 光谱、X 射线光电子能谱 (XPS) 和原子力显微镜 (AFM) 结果证实 SMG 强烈吸附在菱锌矿上。此外，抑制剂CLS在方解石表面吸附较强，而在菱锌矿表面吸附较少。密度泛函理论（DFT）计算证实，SMG 中的氨基促进了相邻羧基与矿物表面金属位点的结合。这些结果表明，SMG是一种可生物降解的生物表面活性剂，是通过浮选从方解石中选择性回收菱锌矿的有前途的捕收剂。