Adsorption mechanism of two different anionic collectors on quartz surface

被引：6
作者：
Kou, Jue [1 ]
Guo, Yu [1 ]
Sun, Tichang [1 ]
Xu, Shihong [1 ]
Xu, Chengyan [1 ]
机构：
[1] School of Civil and Environment Engineering, University of Science and Technology Beijing, Beijing
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2015年 / 46卷 / 11期
基金：
中国国家自然科学基金;
关键词：
Atomic force microscope (AFM); Mixed fatty acid; Quartz; Quartz crystal microbalance with dissipation (QCM-D); Sodium oleate; Zeta potential;
D O I：
10.11817/j.issn.1672-7207.2015.11.005
中图分类号：
学科分类号：
摘要：
A real-time and in-situ measurement of adsorption mass of sodium oleate and KS-I on SiO2 surface activated by Ca2+ was carried out by using quartz crystal microbalance with dissipation (QCM-D). The adsorption mechanism was investigated in combination with single mineral flotation, atomic force microscope (AFM) and Zeta potential as well, and the adsorption mechanism was discussed. The results show that sodium oleate has better flotation performance than KS-I at pH 12.0, and the dosages of both activator and collectors are smaller than those of KS-I. The highest quartz recovery of 97.9% is obtained with 6.48×10-5 mol/L Ca(OH)2 and 30 mg/L sodium oleate. However, by using 90 mg/L KS-I and 2.16×10-4 mol/L Ca(OH)2, the optimum quartz recovery is only 78.6%. Two distinct adsorption behaviors of Ca2+ on SiO2 surface are identified by QCM-D results. Sodium oleate forms a high viscosity and elasticity adsorption layer with adsorption quantity of 5.4×10-6 g/cm2 on the activated SiO2 surface, and there is only one stage of adsorption. However, the adsorption quantity of KS-I on SiO2 is only 2.5×10-8 g/cm2. Sodium oleate forms a adsorption layer with thickness ranging from 15.2 to 97.3 nm on SiO2 surface, but the highest adsorption layer of KS-I is only 10 nm. The electrostatic adsorption occurs on activated quartz surface with both sodium oleate and KS-I, but the adsorption amount of sodium oleate is larger than that of KS-I. © 2015, Central South University of Technology. All right reserved.
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页码：4005 / 4014
页数：9
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