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Published on: June 28, 2019
Adsorption Mechanism of 3-Tetradecylamine Propyl Amidoxime in the Reverse Flotation Separation of Quartz from
Jinpeng Ma1, Jingjie Wu2, Yong Chen2
1Jiangxi Province Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 34100, China.
Abstract:
Magnetite is an excellent resource for steel production, and silicon is a typical harmful impurity in magnetite. Therefore, the removal of quartz minerals is essential to improve the quality of magnetite. Herein, a novel hammer amidoxime surfactant 3-tetradecylamine propyl amidoxime (TPA) was synthesized to collect quartz effectively and improve the recovery of magnetite in reverse flotation. The collecting performance of TPA for magnetite and quartz was contrasted to the conventional surfactant 1-dodecylamine (DA). Foam flotation results showed that TPA could effectively recover quartz, and the recovery was 25% higher than that of DA. Meanwhile, the recovery of magnetite by TPA is 6.92% lower than that by DA. The contact angle revealed that TPA molecules could significantly enhance the surface hydrophobicity of quartz. Fourier transform infrared (FTIR) analysis showed that TPA could adsorb on the quartz surface but not on the magnetite surface. Moreover, the hydrogen atoms of the -NH3+ and -CNOH groups on the TPA molecule were found to form hydrogen bonds with the oxygen atoms on the surface of quartz mineral by ζ potential tests and quantum chemical calculations. Therefore, TPA can be used as an efficient collector for reverse flotation magnetite, contributing to a stable supply of iron ore resources.
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