双酯Gemini季铵盐在氟磷灰石与石英界面吸附行为的研究

Study on the Interface Adsorption Behavior of Diester Gemini Quaternary Ammonium Salt on the Fluorapatite and Quartz

摘要: 对自制双酯Gemini季铵盐进行表面张力测试，量子化学计算，以及单矿物浮选实验，结果表明自制双酯Gemini季铵盐与十二胺盐酸盐（DDAH）相比，具有更低的CMC，更强的阳离子性，更大的分子电负性，并且在低浓度5×10^-6mol/L时，双酯Gemini季铵盐对石英单矿物的浮选上浮率可以达到88.89%，磷灰石上浮率仅为4.04%。通过接触角测试、分子动力学模拟，研究双酯Gemini季铵盐在石英、磷矿界面上的吸附过程，结果表明，相比磷灰石，双酯Gemini季铵盐更易于在石英表面吸附，可作为石英和氟磷灰石浮选分离的捕收剂。

Abstract: Surface tension tests, quantum chemical computation and flotation tests were carried on the self-synthesized Diester Gemini quaternary ammonium salt. The results indicated that Diester Gemini quaternary ammonium salt has lower CMC, stronger cationic, larger molecular electro negativity, and at the low concentration of 5×10^-6 mol/L, resulting in quartz recovery at 88.89%, fluorapatite recovery at 4.04%. According to the results of contact angle tests and molecular dynamics simulations, Diester Gemini quaternary ammonium salt prefer to adsorb on quartz surface than fluorapatite. Thus, the Diester Gemini quaternary ammonium salt can be used as a cationic collector for quartz from fluorapatite.