Semiconductor electrochemistry of coal pyrite. Quarterly technical progress report, July--September 1993
Pyrite (FeS{sub 2}) synthesis was studied in aqueous solution at room temperature and pressure using ferric chloride (FeCl{sub 3}) and sodium hydrosulfide (NaHS) as reactants, and sodium hexametaphosphate ((NaPO{sub 3}){sub 6}) as dispersant, which was added in the system to control the particle size of pyrite. The effects of the reaction pH and the concentrations of the reactants and the dispersant on the characterization of pyrite were studied. The pH of the reaction determines the products of the reaction. Elemental sulfur is produced at pH 2.4. As pH increases, the reaction product becomes a mixture of elemental sulfur plus pyrite at pH 2.9. In the pH range of 3.6 to 5.7, pyrite is formed with a spherical shape and a size of 2 {mu}m. Further increasing pH, the amorphous iron sulfides are obtained. lowering of the concentration of the reactant can decrease the particle size of pyrite only in the earlier stage of the reaction. The final particles have the same size for any initial concentration of the reactants used in the study. Addition of dispersant can change the properties of the products. The mechanism of the dispersant reaction is carrying out currently in this laboratory.
- 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:
- 10134237
- Report Number(s):
- DOE/PC/91303-T9; ON: DE94008379; TRN: 94:003676
- Resource Relation:
- Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
PYRITE
ELECTROCHEMISTRY
CHEMICAL PREPARATION
PARTICLE SIZE
PROGRESS REPORT
SEMICONDUCTOR MATERIALS
COAL
AQUEOUS SOLUTIONS
PH VALUE
CHEMICAL REACTION YIELD
CHEMICAL REACTION KINETICS
MICROSTRUCTURE
010600
400400
360602
PROPERTIES AND COMPOSITION
STRUCTURE AND PHASE STUDIES