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  • http://hdl.handle.net/10402/era.24907
  • Understanding zinc sulfide activation mechanism and impact of calcium sulfate in sphalerite flotation
  • Teng, Fucheng
  • English
  • Zinc sulfide activation
    Surface adsorption
    Sphalerite flotation
  • Jan 4, 2012 10:11 AM
  • Thesis
  • English
  • Adobe PDF
  • 12019591 bytes
  • Quartz crystal microbalance with dissipation (QCM-D) was used to study the zinc sulfide activation with silver, copper and lead. The interactions between calcium sulfate and minerals and gypsum nucleation on functional surfaces were investigated using a QCM-D, surface forces apparatus (SFA), and atomic force microscope (AFM). This study is the first of its kind to apply the QCM-D technique to investigate sphalerite activation, which indroduces a new in-situ approach to investigate surface adsorption and activation in many mineral processes and surface modifications. The fitting of adsorption of copper and lead species to sphalerite at pH 6.5 and 9 with kinetic models indicates that the activation in this pH range is a chemisorption process. Gypsum was found to grow on functional surfaces following the growth rates as -COOH>-OH>-CH3, but not on sphalerite. The uptake of copper and adsorption of xanthate on sphalerite could be retarded in the presence of calcium sulfate.
  • F. Teng, Q. Liu, H. Zeng, In situ kinetic study of zinc sulfide activation using a quartz crystal microbalance with dissipation (QCM-D), Journal of Colloid and Interface Science, 2011 (in press)
    F. Teng, H. Zeng, Q. Liu, Understanding the Deposition and Surface Interactions of Gypsum, Journal of Physical Chemistry C, 115 (2011) 17485-17494
  • Master's
  • Master of Science
  • Department of Chemical and Materials Engineering
  • Chemical Engineering
  • Spring 2012
  • Liu, Qingxia (Chemical and Materials Engineering)
    Zeng, Hongbo (Chemical and Materials Engineering)
  • Zhang, Hao (Chemical and Materials Engineering)
    Szymanski, Jozef (Civil and Environmental Engineering)
    Liu, Qingxia (Chemical and Materials Engineering)
    Zeng, Hongbo (Chemical and Materials Engineering)