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The Influence of Ca2+ and pH on the Interaction between PAHs and Molybdenite Edges

by He Wan 1,2,*, Wei Yang 1, Tingshu He 1,*, Jianbo Yang 3, Lin Guo 3 and Yongjun Peng 4
College of Materials and Mineral Resources, Xi’an University of Architecture and Technology, Xi’an 710055, China
JinDui Cheng Molybdenum Co., Ltd., Xi’an 710077, China
China Molybdenum Co., Ltd., Luanchuan 471500, China
School of Chemical Engineering, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia
Authors to whom correspondence should be addressed.
Minerals 2017, 7(6), 104;
Received: 14 May 2017 / Revised: 13 June 2017 / Accepted: 14 June 2017 / Published: 17 June 2017
Nonpolar hydrocarbon oils are widely used as collectors for floating molybdenite. However, they can only adsorb on molybdenite faces and not on molybdenite edges, resulting in limited molybdenite recovery, especially in processed water containing a high amounts of Ca2+. In this study, the influence of Ca2+ and pH on the adsorption of polycyclic aromatic hydrocarbons (PAHs), as part of composite collection on molybdenite edges, was studied. It was found that PAHs could only adsorb on molybdenite edges in the presence of Ca2+. Ca2+ reacted with molybdenite edges to form CaMoO4 precipitates. Then, CaMoO4 precipitates interacted with PAHs to form a structure of π–cation–π by (1) the cation–π interaction, (2) the π–π interaction and (3) the electrostatic interaction. It was also found that CaMoO4 precipitates on molybdenite edges promoted the adsorption of PAHs. The more the CaMoO4 precipitates, the easier the PAHs adsorption occurred. As a result, the high amount of Ca2+and low pH enhanced the adsorption of PAHs on molybdenite edges. This study provides insights into reducing the deleterious effect of Ca2+ on fine molybdenite flotation. View Full-Text
Keywords: polycyclic aromatic hydrocarbon; molybdenite edges; calcium ions polycyclic aromatic hydrocarbon; molybdenite edges; calcium ions
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Wan, H.; Yang, W.; He, T.; Yang, J.; Guo, L.; Peng, Y. The Influence of Ca2+ and pH on the Interaction between PAHs and Molybdenite Edges. Minerals 2017, 7, 104.

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