The wetting film evolution process is essential for flotation, especially in bubble–particle attachment. A mixed collector has been proved effective in promoting flotation. In this paper, the effect of a mixed collector (MC) composed by n-dodecane (D) and oleic acid (OA) on wetting film evolution was investigated using the extended Derjagin–Landau–Verwey–Overbeek (EDLVO) theory, the Stefan–Reynolds model, induction time, and zeta potential measurement. The hydrophobic force constant between bubble and coal treated by different collectors was analyzed. The results showed that MC was superior in reducing the induction time and increasing the zeta potential. When bubbles interacted with coal treated by MC, they had relatively low interaction energy, high critical film thickness, and high drainage rate. The order of hydrophobic force constant was no reagent < D < OA < MC. It indicated that the hydrophobic interaction between bubbles and coal particles treated by MC was the strongest because of the synergistic effect of D and OA.

中文翻译：

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十二烷-油酸收集剂混合物对气泡与低排量煤之间润湿膜演变的影响

湿膜的演变过程对于浮选至关重要，尤其是在气泡-颗粒附着中。事实证明，混合捕收剂可有效促进浮选。在本文中，使用扩展的Derjagin-Landau-Verwey-Overbeek（EDLVO）理论，研究了由正十二烷（D）和油酸（OA）组成的混合捕集剂（MC）对润湿膜演变的影响。 –雷诺模型，感应时间和Zeta电位测量。分析了不同收集器处理后的气泡与煤之间的疏水力常数。结果表明，MC在减少诱导时间和增加ζ电势方面具有优势。当气泡与MC处理过的煤发生相互作用时，它们具有相对较低的相互作用能，较高的临界膜厚度和较高的排水速率。疏水力常数的顺序是没有试剂＜D ＜OA ＜MC。这表明，由于D和OA的协同作用，气泡与煤颗粒之间的疏水作用最强。