Semiconductor electrochemistry of coal pyrite. Technical progress report, January--March 1993
This project seeks to advance the fundamental understanding of the physicochemical processes occurring at the pyrite/aqueous interface, in the context of coal cleaning, coal desulfurization, and acid mine drainage. A novel approach to the study of pyrite aqueous electrochemistry is proposed, based on the use of both synthetic and natural ( i.e. coal-derived) pyrite specimens, the utilization of pyrite both in the form of micro (i.e. colloidal and subcolloidal) and macro (i.e. rotating ring disk) electrodes, and the application of in-situ direct electroanalytical and spectroelectrochemical characterization techniques. The work performed during this quarter focuses on the synthesis of pyrite in aqueous solutions at room temperature and atmospheric pressure. The experimental results show that the initial product from the reaction between ferrous ions and sulfide ions is X-ray amorphous iron sulfide, and the final product is mackinawite from this reaction. Both amorphous iron sulfide and mackinawite in wet states are oxidized quickly in air to {gamma}-FeOOH. Pyrite can form in aqueous solution through a simple path from a reaction between ferric ions and sulfide ions at room temperature within 9 days. It is believed that a redox reaction occurs between ferric and sulfide ions to form ferrous ions and elemental sulfur. The Fe{sup 2+}, S{sup 2{minus}} ions and elemental sulfur, S{sup o}, in the system can then react with each other to form pyrite. This pathway of pyrite formation can be used in synthesizing nanoparticles of pyrite in microemulsions.
- Research Organization:
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Materials Science and Engineering
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-91PC91303
- OSTI ID:
- 10164207
- Report Number(s):
- DOE/PC/91303-T6; ON: DE93016856
- Resource Relation:
- Other Information: PBD: May 1993
- Country of Publication:
- United States
- Language:
- English
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Semiconductor electrochemistry of coal pyrite
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COAL
DESULFURIZATION
PYRITE
ELECTROCHEMISTRY
SYNTHESIS
IRON COMPOUNDS
CHEMICAL REACTION KINETICS
SULFIDES
PROGRESS REPORT
CLEANING
AQUEOUS SOLUTIONS
ATMOSPHERIC PRESSURE
AMBIENT TEMPERATURE
EXPERIMENTAL DATA
010600
400201
PROPERTIES AND COMPOSITION
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES