Effect of nano-micro bubble size on the flotation of quartz particles

Publish Year: 1396
نوع سند: مقاله کنفرانسی
زبان: English
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NFSI01_211

تاریخ نمایه سازی: 17 آبان 1396

Abstract:

Introduction: Recently, there is a great interest in the use of nano bubbles due to their extensive applications such as: flotation, drug delivery, ultra sound imaging and detergent-free cleaning. In the flotation process, bubble size has a major role in the recovery. Also, amount of the recovery increased by reducing of bubble size. Nano bubbles are smaller than 1 µm and are produced using a nano bubble generator [1-3]. This study investigates the different bubble size distribution (from nano bubbles to micro bubbles) effects on the flotation of the quartz particles. Material and Methods: Quartz particles of three fraction was used for flotation tests. The collector used in the flotation tests was Dodecyl amine, 50 g/ton, from Merck and the frother used in the flotation tests was MIBC, 22.4 ppm, from Sigma-Aldrich. Nano-micro bubbles were generated in water from dissolved gas using a nano-micro bubble generator, concentration of MIBC frother and the hydrodynamic cavitation process. Flotation tests were conducted using a 1 L mechanical cell and four different bubble size. Results and Conclusion: Result showed that maximum recovery of quartz particles was obtained 95.59 % for bubble size of 171 nm. In other words, the flotation recovery in the nano bubbles size was higher than micro bubbles. One of the reasons for increasing the recovery of particles in the nano bubbles size was due to the adsorption of dodecyl amine on quartz particles. These amines absorb small bubbles and small bubbles attached the coarse bubbles and increase the recovery of flotation. Another reason for increasing the recovery is the absorption of amine molecules on the nanobubbles by hydrophobic reaction that is the hydrophobic tails surrounding the bubbles.

Authors

Sabereh Nazari

Faculty of Engineering, Department of Mining Engineering, University of Tehran, Tehran, Iran, P.O. Box ۴۵۶۳-۱۱۱۵۵

Sied Ziaedin Shafaei

Faculty of Engineering, Department of Mining Engineering, University of Tehran, Tehran, Iran, P.O. Box ۴۵۶۳-۱۱۱۵۵

Mahdi Gharabaghi

Faculty of Engineering, Department of Mining Engineering, University of Tehran, Tehran, Iran, P.O. Box ۴۵۶۳-۱۱۱۵۵

Rahman Ahmadi

Faculty of Engineering, Department of Mining Engineering, Imam Khomeini International University of Qazvin, Qazvin, Iran, P.O. Box ۳۴۱۴۹۱۶۸۱۸