Ash and slag characterization. Final report for the period ending March 31, 1986
A procedure was developed for mine sampling and the storage of standard coals under argon. In total, 53 coals were collected and are also available to other DOE supported projects at the Center. Task 2 was the study of mineral transformation during ashing of low-rank coals. Results of this study verified the importance of organically-bound alkalies, specifically calcium and sodium, in forming low-melting temperature aluminosilicates (i.e., melilites). Task 3 highlighted the viscosity studies on the molten ash of low-rank coals. A major part of this study involved the modification of the Urbain equation so that it can be used to predict the Newtonian behavior of low-rank coal slags. In addition, the effects of iron and sodium on viscosity, hysteresis, and the nature of the non-Newtonian flow were examined. Task 4 comprised the identification of volatilized species evolved during the combustion of selected low-rank coals. In each case sodium, potassium and sulfur were found to be major components of the condensed volatiles. Verification of their volatility on an experimental basis has significance in their possible contributions to forming new solid and liquid phases at high temperatures. Finally Task 5 evaluated the use of various sessile drop techniques to determine the surface tension of low-rank coal slags. Results show that meaningful surface tension measurements can be obtained with the use of vitreous carbon as a substrate.
- Research Organization:
- North Dakota Univ., Grand Forks (USA). Energy and Mineral Research Center
- DOE Contract Number:
- FC21-83FE60181
- OSTI ID:
- 5446843
- Report Number(s):
- DOE/FE/60181-2092; ON: DE86014275
- Country of Publication:
- United States
- Language:
- English
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Ash and slag characterization for low-rank coals
Ash and slag characterization for low-rank coals
Related Subjects
54 ENVIRONMENTAL SCIENCES
COAL
MINERAL WASTES
FLY ASH
WASTE MANAGEMENT
SLAGS
CALCIUM
CHEMICAL COMPOSITION
CHEMICAL PROPERTIES
IRON
POTASSIUM
SODIUM
SULFUR
SURFACE TENSION
VISCOSITY
VOLATILITY
AEROSOL WASTES
ALKALI METALS
ALKALINE EARTH METALS
ASHES
CARBONACEOUS MATERIALS
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
MANAGEMENT
MATERIALS
METALS
NONMETALS
RESIDUES
SOLID WASTES
SURFACE PROPERTIES
TRANSITION ELEMENTS
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)