This study designed a mixed surfactant with solubilization behavior for selective flotation separation of feldspar and quartz. By optimizing the compounding ratio and dosage of reagents, the optimal mixed surfactants, dodecylamine (DDA), sodium dodecyl sulfate (SDS), and dodecane with the concentrations of 1.75, 0.58, and 3.5 mmol/L, used in flotation separation of feldspar and quartz has the maximum flotation difference of 91.36 % at pH 3 for single mineral. The result of flotation experiments of artificial-mixed-ore shows that the Al2O3 grade was maintained at 14.23 %, and Al2O3 recovery was achieved at 69.21 % for the froth product with a selectivity index (SI) of 1.59. The bench-scale flotation tests confirmed a better effect by using mixed surfactants with Al2O3 grades of 14.72 % and the Al2O3 recovery of 66.62 %. The separation mechanism of quartz and feldspar was proposed through analyses of critical micelle concentration (CMC), fourier transform infrared spectrometer (FTIR), contact angle, zeta potential, microscopy image, and X-ray photoelectron spectroscopy (XPS) measurements, and indicated that the flotation difference between quartz and feldspar mainly originated from the selective adsorption of anions on feldspar and the aggregation and subsidence of quartz in mixed surfactants.

中文翻译：

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具有增溶特性的混合表面活性剂：通过自组装浮选分离长石和石英


本研究设计了一种具有增溶行为的混合表面活性剂，用于长石和石英的选择性浮选分离。通过优化试剂的复合比例和用量，用于长石和石英浮选的最佳混合表面活性剂十二烷胺 （DDA）、十二烷基硫酸钠 （SDS） 和十二烷，浓度分别为 1.75、0.58 和 3.5 mmol/L，在 pH 3 条件下，单一矿物的最大浮选差为 91.36 %。人工混合矿石浮选实验结果表明，泡沫产物的 Al2O3 品位保持在 14.23 %，Al2O3 回收率达到 69.21 %，选择性指数 （SI） 为 1.59。小规模浮选测试证实，使用 Al2O3 品位为 14.72% 且 Al2O3 回收率为 66.62% 的混合表面活性剂效果更好。通过临界胶束浓度 （CMC）、傅里叶变换红外光谱仪 （FTIR）、接触角、zeta 电位、显微镜图像和 X 射线光电子能谱 （XPS） 测量分析，提出了石英和长石的分离机理，表明石英和长石的浮选差异主要源于阴离子在长石上的选择性吸附和石英在混合表面活性剂中的聚集和沉降。