Flotation and adsorption of quaternary ammonium cationic collectors on diaspore and kaolinite
Flotation and adsorption of quaternary ammonium cationic collectors on diaspore and kaolinite
复制标题
季铵盐阳离子捕收剂在水硬石和高岭石上的浮选和吸附
DOI：
10.1016/s1003-6326(11)61046-7
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发表时间：
2011-11-01
影响因子：
4.5
通讯作者：
Wang Xing-jie
中科院分区：
文献类型：
--
作者：
Jiang Hao;Xu Long-hua;Wang Xing-jie
研究了十二烷基三甲基氯化铵(DTAC)和十六烷基三甲基氯化铵(CTAC)在一水硬铝石和高岭石上的浮选和吸附行为。采用溶液耗尽法测定吸附等温线。为了进一步研究季胺在矿物-水界面上的吸附，还进行了荧光探针法和Zeta电位测量。结果表明，以DTAC和CTAC为捕收剂时，高岭石的浮选回收率随pH的升高而降低，而一水硬铝石的浮选回收率则相反。随着捕收剂碳链长度的增加，矿物的浮选回收率增加。但高岭石的增长速度明显低于一水硬铝石。在低浓度范围内，由于静电作用，阳离子表面活性剂很容易吸附在一水硬铝石表面。高岭石表面也存在离子交换过程。随着表面活性剂浓度的进一步增加，吸附被归因于链-链相互作用的疏水缔合。矿物表面的微极性研究表明，CTAC比DTAC具有更好的疏水性能。在相同的溶液浓度下，CTAC在一水硬铝石上形成的团聚体比在高岭石上形成的团聚体大。结果还表明，阳离子表面活性剂的链长对一水硬铝石吸附的影响大于对高岭石的影响，这与浮选结果一致。
The flotation and adsorption behaviors of dodecyltrimethylammonium chloride(DTAC) and cetyltrimethylammonium chloride(CTAC) on diaspore and kaolinite were studied. Solution depletion methods were used to determine adsorption isotherms. Fluorescence probe test along with Zeta potential measurement was also conducted for further investigation into the adsorption of quaternary amines at the mineral-water interface. The results show that the flotation recovery of kaolinite decreases with an increase in pH when DTAC and CTAC are used as collectors, while diaspore is on the contrary. As the carbon chain length of the collectors increases, the flotation recoveries of minerals increase. However, the increment rate of kaolinite is significantly lower than that of diaspore. In the low surfactant concentration range, the cationic surfactants adsorb readily on diaspore surfaces just due to electrostatic interactions. As for kaolinite surfaces, ion exchange process also exists. With a further increase in surfactant concentration, the adsorption was ascribed to the hydrophobic association of chain-chain interactions. Micro-polarity of mineral surfaces study shows that CTAC has a better hydrophobic characteristic than DTAC. Larger aggregates are formed with CTAC on diaspore than on kaolinite in the same solution concentration. The results also indicate that the chain length of cationic surfactants has a greater influence on the adsorption of diaspore than on kaolinite, which is consistent with the flotation result.