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采用了新型Gemini双季铵盐捕收剂丁烷-1,4-双十二烷基二甲基溴化铵(BDDA)和乙烷-1,2-双十二烷基二甲基溴化铵(EDDA)对比研究了其对高岭石、叶腊石、伊利石的浮选行为及作用机理。单矿物试验结果表明,在广泛的pH范围内,新型Gemini双季铵盐捕收剂BDDA和EDDA对三种铝硅酸盐矿物具有优异的捕收性能,且BDDA的捕收能力强于EDDA。红外光谱和动电位研究表明,Gemini双季铵盐捕收剂对三种铝硅酸盐矿物的作用机理为静电吸附和氢键作用。采用DFT密度泛函理论,在B3LYP/6-31G(d)水平上对捕收剂阳离子BDDA2+和EDDA2+进行量化计算,结果表明BDDA的捕收能力强于EDDA。这与单矿物浮选结果、动电位测定结果一致。
The new Gemini double quaternary ammonium salt collector butane-1,4-dodecyldimethylammonium bromide (BDDA) and ethane-1,2-didodecyl dimethyl bromide Ammonium (EDDA) was used to study the flotation behavior and mechanism of kaolinite, pyrophyllite and illite. The single mineral test results show that the new Gemini double quaternary ammonium salt collectors BDDA and EDDA have excellent catching properties for the three aluminosilicate minerals over a wide range of pHs, and BDDA has better ability to collect than EDDA. Infrared spectroscopy and potentiodynamic studies show that the mechanism of Gemini double quaternary ammonium salt collector on the three kinds of aluminosilicate minerals electrostatic adsorption and hydrogen bonding. DFT density functional theory was used to quantify collector cations BDDA2 + and EDDA2 + at B3LYP / 6-31G (d) level. The results show that BDDA has a better ability of trapping than EDDA. This is consistent with the single mineral flotation results and the potentiodynamic measurements.