Control of pyrite surface chemistry in physical coal cleaning
The removal of pyrite from coal by flotation or any other surface- based separation process is often hampered by the apparent hydrophobicity of the mineral. Microflotation tests and induction time measurements conducted under different conditions showed that the hydrophobicity of coal pyrite is due to superficial oxidation of the mineral surface. X-ray photoelectron spectroscopy (XPS) analysis of the oxidized pyrite samples suggests that the sulfur-rich surfaces formed during oxidation may be responsible for the hydrophobicity of both coal pyrite and mineral pyrite. Based on these findings, an oxidation mechanism is proposed in which metal polysulfides and iron oxides-hydroxides are produced. The floatability of both coal pyrite and mineral pyrite can be correlated with the atomic ration between these hydrophobic and hydrophilic species that are formed on the surface. 14 refs., 7 figs., 1 tab.
- Research Organization:
- Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (USA). Dept. of Mining and Minerals Engineering
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- FG22-89PC89789
- OSTI ID:
- 5709988
- Report Number(s):
- DOE/PC/89789-T2; ON: DE91012788
- Country of Publication:
- United States
- Language:
- English
Similar Records
Control of pyrite surface chemistry in physical coal cleaning. Third quarterly progress report, March 1, 1990--May 31, 1990
Control of pyrite surface chemistry in physical coal cleaning
Related Subjects
COAL
SURFACE PROPERTIES
PYRITE
BINDING ENERGY
CORRELATIONS
ELECTRONIC STRUCTURE
FLOTATION
HYDROXIDES
INDUCTION
IRON OXIDES
OXIDATION
PH VALUE
PROGRESS REPORT
SPECTRA
SULFIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
DOCUMENT TYPES
ENERGY
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
IRON COMPOUNDS
IRON SULFIDES
MATERIALS
MINERALS
OXIDES
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SULFIDE MINERALS
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
010300* - Coal
Lignite
& Peat- Preparation- (1987-)
010600 - Coal
Lignite
& Peat- Properties & Composition