Flotation and flocculation chemistry of coal and oxidized coals
The objective of this research project is to understand the fundamentals involved in the flotation and flocculation of coal and oxidized coals and elucidate mechanisms by which surface interactions between coal and various reagents enhance coal beneficiation. An understanding of the nature of the heterogeneity of coal surfaces arising from the intrinsic distribution of chemical moieties is fundamental to the elucidation of mechanism of coal surface modification and its role in interfacial processes such as flotation, flocculation and agglomeration. A new approach for determining the distribution in surface properties of coal particles was developed in this study and various techniques capable of providing such information were identified. Distributions in surface energy, contact angle and wettability were obtained using novel techniques such as centrifugal immersion and film flotation. Changes in these distributions upon oxidation and surface modifications were monitored and discussed. An approach to the modelling of coal surface site distributions based on thermodynamic information obtained from gas adsorption and immersion calorimetry is proposed. Polyacrylamide and dodecane was used to alter the coal surface. Methanol adsorption was also studied. 62 figs.
- Research Organization:
- Columbia Univ., New York, NY (USA)
- Sponsoring Organization:
- DOE/FE
- DOE Contract Number:
- FG22-87PC79919
- OSTI ID:
- 6471008
- Report Number(s):
- DOE/PC/79919-T2; ON: DE91002479
- Country of Publication:
- United States
- Language:
- English
Similar Records
Flotation and flocculation chemistry of coal and oxidized coals: Annual technical progress report, September 15, 1987 to September 15, 1988
Flotation and flocculation chemistry of coal and oxidized coals
Related Subjects
COAL
SURFACE PROPERTIES
METHANOL
ADSORPTION
POLYAMIDES
ADSORPTION HEAT
CATIONS
DODECANE
FLOCCULATION
FLOTATION
HETEROGENEOUS EFFECTS
PROGRESS REPORT
SURFACE TENSION
WETTING HEAT
ALCOHOLS
ALKANES
CARBONACEOUS MATERIALS
CHARGED PARTICLES
DOCUMENT TYPES
ENERGY SOURCES
ENTHALPY
FOSSIL FUELS
FUELS
HYDROCARBONS
HYDROXY COMPOUNDS
IONS
MATERIALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PHYSICAL PROPERTIES
POLYMERS
PRECIPITATION
SEPARATION PROCESSES
SORPTION
THERMODYNAMIC PROPERTIES
010600* - Coal
Lignite
& Peat- Properties & Composition
010300 - Coal
Lignite
& Peat- Preparation- (1987-)