Insights into Selection of the Auxiliary Collector and Its Applicability Analysis for Improving Molybdenite Flotation

Hui Li,Yufeng Guo,Jianping Jin,Tingshu He,Yuexin Han,He Wan

doi:10.3390/min11050528

Abstract

In this study, two auxiliary collectors (methyl naphthalene and naphthalene) of molybdenite and the traditional collector (kerosene) were mixed for molybdenite flotation, respectively. According to the selection and analysis of the auxiliary collector, it was found that the surface energy (γC= 44.50 mJ/m2) of the polycyclic aromatic hydrocarbons is very close to that (γS= 42.55 mJ/m2) of the molybdenite {100} surface. Therefore, it can be physically adsorbed onto the molybdenite {100} surface according to the principle of similar compatibility. Batch flotation was conducted on actual ore with the mixed collector, compared with kerosene alone. Batch flotation results showed that the mixed collector at a mass ratio of 95:5 of main collector to auxiliary collector at pH 11.0 improved molybdenite flotation, that is, the Mo recovery was increased by 3–4%. The practical application feasibility of the auxiliary collector was analyzed by the filtration speed of the flotation concentrate and the crystal resolution characteristics of the auxiliary collector. The results show that solid naphthalene (Nap) is easy to crystallize at low temperature and adhere to the surface of the flotation concentrate, resulting in a decrease of filtration velocity, while liquid methylnaphthalene (MNap) does not crystallize at low temperature. These results imply that the mixed collector Kerosene/MNap can generate a superior synergistic effect and achieve better collecting capacity than kerosene alone, resulting in the increase of flotation recovery by 3–4 percentage points. Moreover, the addition of MNap has little negative impact on the subsequent treatment of the product.

Highlights

College of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China; National-Local Joint Engineering Research Center of High-Efficient Exploitation Technology for Refractory
We reported research on improving fine molybdenite flotation using a combination of aliphatic hydrocarbon oil and liquid polycyclic aromatic hydrocarbon [25]
We obtained a maximum recovery of 89.01% and 85.74% using the kerosene/MNap as the collector at temperatures of 25 ◦ C and 3 ◦ C, while using the kerosene/Nap as the collector at the temperature of 25 ◦ C and 3 ◦ C we obtained 88.23% and 85.41%

Summary

Introduction

College of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China; National-Local Joint Engineering Research Center of High-Efficient Exploitation Technology for Refractory. The results show that solid naphthalene (Nap) is easy to crystallize at low temperature and adhere to the surface of the flotation concentrate, resulting in a decrease of filtration velocity, while liquid methylnaphthalene (MNap) does not crystallize at low temperature. These results imply that the mixed collector Kerosene/MNap can generate a superior synergistic effect and achieve better collecting capacity than kerosene alone, resulting in the increase of flotation recovery by 3–4 percentage points. The rupture of weak van der Waals forces between S−Mo−S layers exposes a low-energy surface, the basal plane or “face”. These edge and face surfaces display different surface properties, especially wettability [4]

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Conclusion