Hydrophobic character of pretreated coal surfaces
Conference
·
· Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States)
OSTI ID:5955079
Increased hydrophobicity and hence the flotability of coals of different rank has been observed for CO/sub 2/ pretreatment and/or controlled thermal pretreatment. DRIFT- and ATR-FTIR and XPS techniques have been used to determine the surface chemical characteristics in order to evaluate coal hydrophobicity. These results agree very well with those determined by traditional methods. The enhanced hydrophobicity of CO/sub 2/-treated coal is attributed to the high specific affinity of coal for CO/sub 2/ which results in the displacement of pore water and hydration water by CO/sub 2/ and on pressure release leads to nanobubble formation at the coal surface in aqueous suspension. Increased hydrophobicity of lignite by thermal treatment arises from the removal of pore water, hydration water and some organic OH functional groups as well as the diffusion of volatile matter to the surface and the reorientation of surface functional groups.
- Research Organization:
- Univ. of Utah, Salt Lake City (USA)
- DOE Contract Number:
- FG22-85PC80530
- OSTI ID:
- 5955079
- Report Number(s):
- CONF-8809271-
- Conference Information:
- Journal Name: Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States) Journal Volume: 33:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
010300 -- Coal
Lignite
& Peat-- Preparation-- (1987-)
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ADSORPTION
AIR
ANTHRACITE
BITUMINOUS COAL
BLACK COAL
BROWN COAL
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
COAL
COAL PREPARATION
COAL RANK
CRYSTAL STRUCTURE
DEASHING
EFFICIENCY
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY SOURCES
FLOTATION
FLUIDS
FOSSIL FUELS
FOURIER TRANSFORMATION
FUELS
GASES
HEAT TREATMENTS
INFRARED SPECTRA
INTEGRAL TRANSFORMATIONS
LIGNITE
MANAGEMENT
MATERIALS
MATERIALS RECOVERY
MATTER
MICROSTRUCTURE
NITROGEN
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
POROSITY
PRESSURIZING
PROCESSING
RECOVERY
REMOVAL
SEPARATION PROCESSES
SORPTION
SPECTRA
SPECTROSCOPY
SUBBITUMINOUS COAL
SURFACE PROPERTIES
TRANSFORMATIONS
VOLATILE MATTER
WASTE MANAGEMENT
WASTE PROCESSING
WATER REMOVAL
X-RAY SPECTROSCOPY
010300 -- Coal
Lignite
& Peat-- Preparation-- (1987-)
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ADSORPTION
AIR
ANTHRACITE
BITUMINOUS COAL
BLACK COAL
BROWN COAL
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
COAL
COAL PREPARATION
COAL RANK
CRYSTAL STRUCTURE
DEASHING
EFFICIENCY
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY SOURCES
FLOTATION
FLUIDS
FOSSIL FUELS
FOURIER TRANSFORMATION
FUELS
GASES
HEAT TREATMENTS
INFRARED SPECTRA
INTEGRAL TRANSFORMATIONS
LIGNITE
MANAGEMENT
MATERIALS
MATERIALS RECOVERY
MATTER
MICROSTRUCTURE
NITROGEN
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
POROSITY
PRESSURIZING
PROCESSING
RECOVERY
REMOVAL
SEPARATION PROCESSES
SORPTION
SPECTRA
SPECTROSCOPY
SUBBITUMINOUS COAL
SURFACE PROPERTIES
TRANSFORMATIONS
VOLATILE MATTER
WASTE MANAGEMENT
WASTE PROCESSING
WATER REMOVAL
X-RAY SPECTROSCOPY