Flotation and flocculation chemistry of coals and oxidized coals: Technical progress report, March 15, 1988--June 15, 1988
A novel technique based on the centrifugal force required to detach particles from the liquid/vapor interface has independently established the existence of surface energy distribution in coal. In addition film flotation of coal and polymer treated coal samples from various points on the partition curves shows that the observed heterogeneity and surface energy distribution are representative of single coal particles. Cationic and nonionic polyacrylamide adsorption on coal was studied along with film flotation of coal samples treated with these polymers. Surface energy distribution spectra constructed from cumulative partition curves obtained by film flotation reveals useful new information on possible conformations of the adsorbed polymers. Adsorption of PAM on coal occurs by hydrogen bonding and hydrophobic interaction leading to nitrated hydrocarbon and amide surfaces respectively. In the case of CAPM treated coal the surface comprises of 30% amide groups, 20% water, bound to adsorbed polymer and 10% to 15% nitrated hydrocarbons.35% of the surface of coal treated with NPAM consists of water of hydration and 20% nitrated hydrocarbon. The observed decrease in hydrophobicity is due to the water of hydration along with adsorbed polymer molecules. 11 refs., 7 figs.
- Research Organization:
- Columbia Univ., New York (USA)
- DOE Contract Number:
- FG22-87PC79919
- OSTI ID:
- 6988089
- Report Number(s):
- DOE/PC/79919-3; ON: DE88015033
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Flotation and flocculation chemistry of coal and oxidized coals: Technical progress report, December 15, 1987 to March 15, 1988
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Related Subjects
ACRYLAMIDE
ADSORPTION ISOTHERMS
COAL
SURFACE PROPERTIES
AFFINITY
CHEMICAL STATE
FLOCCULATION
FLOTATION
OXIDATION
PROGRESS REPORT
SORPTIVE PROPERTIES
AMIDES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
ISOTHERMS
MATERIALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PRECIPITATION
SEPARATION PROCESSES
010600* - Coal
Lignite
& Peat- Properties & Composition
010300 - Coal
Lignite
& Peat- Preparation- (1987-)