Coal flotation and flocculation in the presence of humic acids: Fianl report, January 1--December 31, 1988
- Department of Mechanical Engineering & Energy Processes, Southern Illinois Univ., Carbondale, IL (United States)
The principle of coal cleaning using humic acid as follows. Humic acid is an anionic polyelectrolyte which possesses a high density of carboxyl groups. The mechanism of coal depression involves the selective adsorption of humic acid on the hydrophobic coal through hydrophobic bonding. Pyrite and ash are hydrophilic in nature and can be separated from the carbonaceous part of the coal, thus resulting in a cleaner coal. During the one-year period of investigation, the following tasks were accomplished: (1) determination of electrokinetic properties of coal; (2) depression of coal flotation due to the humic acid addition, (3) reversal of coal depression (originally caused by humic acid addition) by a sequential treatment of kerosene and MIBC, and (4) evaluation of coal cleaned as a function of the amount of humic acid added and air flow rate. It was found that the coal cleaned by this process has 24% lower ash content than the raw coal. 3 refs., 10 figs.
- Research Organization:
- Southern Illinois Univ., Carbondale (USA). Coal Extraction and Utilization Research Center
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FC22-88PC88861
- OSTI ID:
- 6177647
- Report Number(s):
- DOE/PC/88861-T6; ON: DE89009573
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL
FLOCCULATION
ASHES
FLOTATION
HUMIC ACIDS
ILLINOIS
KEROSENE
PROGRESS REPORT
SLURRIES
CARBONACEOUS MATERIALS
DISPERSIONS
DOCUMENT TYPES
ENERGY SOURCES
FEDERAL REGION V
FOSSIL FUELS
FUELS
LIQUID FUELS
MATERIALS
MIXTURES
NORTH AMERICA
ORGANIC ACIDS
ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
PRECIPITATION
RESIDUES
SEPARATION PROCESSES
SUSPENSIONS
USA
010300* - Coal
Lignite
& Peat- Preparation- (1987-)