How to sustainably produce bauxite by effective reverse froth flotation of kaolinite at low temperature is an urgent problem to be solved in the field of mineral processing. In this work, a novel amino-based Gemini surfactant butadiyl-1, 4-bis (dimethyl dodecylammonium bromide) (BBDB) was prepared and first utilized as a novel collector for kaolinite flotation. Its flotation performance for kaolinite was compared with that of the common monomolecular surfactant 1-dodecylamine (DDA) by micro-flotation tests. The tests results indicated that 95% kaolinite recovery was obtained using 2.0 × 10⁻⁴ mol/L BBDB at 25 ℃, which was half of the dosage when DDA obtained the maximum kaolinite recovery of 81%. At extremely low temperature (0 ℃), 3.0 × 10⁻⁴ mol/L BBDB could still collect 91% kaolinite, while DDA showed a frustrating ability. The contact angle tests indicated that BBDB could still significantly improve the hydrophobicity of the kaolinite surface (contact angle 71.7°) than DDA (contact angle only 25.8°) at 0 ℃. The Krafft point comparison tests indicated that BBDB had a much lower Krafft point (below 0 ℃) than DDA. Fourier transform infrared spectroscopy (FTIR)-spectrum analysis and zeta potential measurements showed that BBDB was physically adsorbed on the surface of kaolinite through electrostatic interaction.

如何通过高岭石高效反浮选法在低温下可持续生产铝土矿是选矿领域亟待解决的问题。在这项工作中，制备了一种新型氨基双子表面活性剂butadiyl-1,4-bis（二甲基十二烷基溴化铵）（BBDB），并首次用作高岭石浮选的新型捕收剂。通过微浮选试验，将其对高岭石的浮选性能与常见的单分子表面活性剂1-十二胺（DDA）进行了比较。试验结果表明，在25℃下使用2.0×10 ^-4 mol/L BBDB可获得95%的高岭石回收率，这是DDA获得81%最高高岭石回收率时用量的一半。在极低温度（0℃）下，3.0 × 10 ^-4mol/L BBDB 仍然可以收集 91% 的高岭石，而 DDA 显示出令人沮丧的能力。接触角测试表明BBDB在0℃下仍能比DDA（接触角仅为25.8°）显着提高高岭石表面的疏水性（接触角71.7°）。克拉夫特点比较试验表明，BBDB 的克拉夫特点（低于 0 ℃）比 DDA 低得多。傅里叶变换红外光谱 (FTIR) 光谱分析和 zeta 电位测量表明，BBDB 通过静电相互作用物理吸附在高岭石表面。