Type of Document Master's Thesis Author Chen, Xianguo Author's Email Address email@example.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 Keywords
- surface chemistry
Date of Defense 1997-08-23 Availability unrestricted Abstract(ABSTRACT)
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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