鉱物処理

[2603] Study of Bubble Collisions and Attachment with Molybdenite and Chalcopyrite Surface in an Electrolyte Solution and a Flotation Collector.

^○Suyantara Gde Pandhe Wisnu¹, Hirajima Tsuyoshi², Mohamed A. M. Elmahdy Ahmed^2,3, Miki Hajime², Sasaki Keiko² (1.Graduate School of Engineering, Kyushu University, Japan, 2.Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, 3.Central Metallurgical Research & Development Institute, Helwan, Cairo, Egypt)

司会:芳賀一寿(秋田大学)

Keywords:chalcopyrite, molybdenite, bubble-particle interaction, kerosene, MgCl2

In copper-molybdenite (Cu-Mo) conventional flotation circuit, molybdenite is collected as froth product by adding collectors while chalcopyrite is depressed by adding sodium hydrosulphide as depressant. In order to have an effective flotation, molybdenite particles need to form a stable bubble-particle aggregates while moving to the froth layer. Understanding the mechanism of bubble-particle interaction in the presence of a collector is one of the key factors to improve the selectivity of Cu-Mo flotation process. This work investigated the effect of kerosene as collector on bubble interaction with molybdenite and chalcopyrite surface in MgCl₂ solution at pH 6. Bubble-particle interaction such as bubble collision, bounce, and attachment to the mineral surfaces was captured using a high-speed camera. It was found that after several collisions, bubble could displace the intervening liquid film on mineral surface and form a three-phase contact (TPC) faster in the presence of kerosene in 0.01 M MgCl₂ at pH 6 for both minerals. The reason is because kerosene increases surface hydrophobicity and destabilizes the intervening liquid layer on mineral surface.