Title page for ETD etd-110398-115411

Type of Document Master's Thesis
Author Chen, Xianguo
Author's Email Address chen6688@aol.com
URN etd-110398-115411
Title Control of Surface Chemistry of Gold, Pyrite and Pyrrhotite
Degree Master of Science
Department Mining and Minerals Engineering
Advisory Committee
Advisor Name Title
Yoon, Roe-Hoan Committee Chair
Adel, Gregory T. Committee Member
Karmis, Michael E. Committee Member
Luttrell, Gerald H. Committee Member
  • surface chemistry
  • gold
  • pyrite
  • pyrrhotite
Date of Defense 1997-08-23
Availability unrestricted

Removing pyrite from coal and pyrrhotite from pentlandite play a critical role in coal and nickel production, respectively, to meet the stringent restriction on SO2 emission. The present project investigates first the mechanism of xanthate adsorption on gold using Atomic Force Microscope (AFM), then the depression of pyrite and pyrrhotite using the synthetic polymers developed by Cytec Industries. The results show that for xanthate/gold system, dixanthogen is the only species that renders the surface hydrophobic. Chemisorbed xanthate is observed on the gold surface but is hydrophilic. The synthetic polymers may adsorb on pyrite and pyrrhotite possibly through the hydrophobic interaction between the hydrophobic moiety of the polymer and the mineral surface that has been hydrophobized by collector adsorption. The hydrophilic moieties of the polymer are exposed to the aqueous phase and render the surface hydrophilic.

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