期刊
ADVANCED POWDER TECHNOLOGY
卷 31, 期 8, 页码 3628-3639出版社
ELSEVIER
DOI: 10.1016/j.apt.2020.07.011
关键词
Ilmenite; Titanaugite; Thermodynamic properties; In situ AFM imaging; Adsorption mechanisms
资金
- National Natural Science Foundation of China [51704263, U1908226, 21606210, U1704252, 19IRTSTHN028]
- Postdoctoral fund of Henan Province [174793]
Titanaugite particles are detrimental to the flotation of fine ilmenite. In this work, the surface adsorption thermodynamic, kinetic properties and the adsorption mechanism of sodium oleate on ilmenite and titanaugite surfaces were investigated by measuring surface wettability, lipophilic hydrophilic ratio, surface free energy, adsorption rate, adsorption density and adsorption thickness. The hydrophilicity of the minerals were determined by the contact angle, lipophilic hydrophilic ratio, gamma(LW)(s) value, and gamma(AB)(s)/gamma(s) value. The surface wettability results showed that the hydrophilicity of the minerals decreased following: -20 mu m titanaugite >-20 mu m ilmenite >-38 + 20 mu m ilmenite >- 74 + 38 mu m ilmenite. The adsorption process can be represented with Langmuir isotherm and a pseudo second-order kinetic model. Calculation of the adsorption thermodynamic parameters confirmed that the adsorption of sodium oleate on ilmenite surfaces is spontaneous, feasible, and endothermic. And it was also confirmed that sodium oleate was adsorbed onto ilmenite due to both physical and chemical adsorption. In situ AFM imaging visually demonstrated that the adsorption density and thickness of the sodium oleate adsorbed onto titanaugite were lower than those of sodium oleate on ilmenite, which was consistent with the adsorption thermodynamic parameters. It was further confirmed that the electrostatic interaction, chemisorption, hydrogen-bonding adsorption and specific hydrogen-bonding adsorption were the main mechanisms for the sodium oleate adsorbed onto ilmenite, as the zeta potential and XPS spectra analyses. (C) 2020 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据