Further studies of the effects of oxidation on the surface properties of coal and coal pyrite
- Univ. of California, Berkeley, CA (United States)
The objective of this research was to investigate the oxidation behavior of coal and coal pyrite and to correlate the changes in the surface properties induced by oxidation, along with the intrinsic physical and chemical properties of these organic and inorganic materials, with the behavior in physical coal cleaning processes. This provide more fundamental knowledge for understanding the way in which different factors interact in a medium as heterogeneous as coal. Fourteen coal samples of different ranks ranging from high to medium sulfur content were studied by dry oxidation tests at different temperatures and humidities, and by wet oxidation tests using different oxidizing agents. The concentration of surface oxygen functional groups was determined by ion-exchange methods. The changes in the coal composition with oxidation were analyzed by spectroscopic techniques. The wettability of as-received and oxidized coal and coal pyrite samples was assessed by film flotation tests. The electrokinetic behavior of different coals and coal pyrite samples was studied by electrokinetic tests using electrophoresis. Possible oxidation mechanisms have been proposed to explain the changes on the coal surface induced by different oxidation treatments.
- Research Organization:
- Univ. of California, Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG22-90PC90287
- OSTI ID:
- 10110773
- Report Number(s):
- DOE/PC/90287-T15; ON: DE95006248; BR: AA1525050
- Resource Relation:
- Other Information: TH: Thesis (Ph.D.); PBD: 1994
- Country of Publication:
- United States
- Language:
- English
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