Enhancing Gold Recovery from Nevada Double Refractory Gold Ores using a Novel Dual Bubble Generator

  • Author / Creator
    Huang, Jian
  • In this study, the influence of dual bubble generator on mineral flotation was investigated. A Venturi-based dual bubble generator was designed and characterized in both liquid-gas two-phase system and solid-liquid-gas three-phase flotation system. The dual bubble generator featured immediately contact of fresh micron size bubbles generated by hydrodynamic cavitation with conventional flotation size bubbles produced by forcing the air through ceramic sparger into the liquid downstream of the Venturi tube, reducing bubble aging and hence the bubble-particle induction time. In the two-phase system, the influence of the gas injection rate, gas injection point, fluid velocity and addition of frother on the size of bubbles and gas hold up was investigated. In the three-phases flotation test, the effect of different flotation methods and different bubble generators on fine particle flotation was studied. Increasing gas injection rate was found to increase both the gas hold up and bubble size. Increasing the frother concentration led to an increase in gas hold up but a decreased in the size of bubbles. Injection of gas at Venturi port (G1) generated small bubbles while injection of gas at expanding zone after Venturi (G2) led to generation of large bubbles. The use of the dual bubble generator was found to enhace both the fine gold recovery and the gold grade of the concentrate.

  • Subjects / Keywords
  • Graduation date
    Fall 2018
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.