Crystallization and vaporization studies on synthetic coal slag compositions. [18 refs]
Technical Report
·
OSTI ID:7291207
Insight as to the chemical behavior of coal slags accumulating on the walls of MHD systems can be gained by examining the results of high temperature experiments on K/sub 2/O-CaO-Al/sub 2/O/sub 3/-SiO/sub 2/ mixtures. An increase in CaO content may increase a/sub K/sub 2/O/ appreciably for certain compositions. Potassium aluminate-silica solid solutions, some of which are relatively water soluble, occur over a significant range of silica-poor and Ca-rich compositions at 1400/sup 0/C. Two synthetic slags, with compositions falling close to an observed distribution of coal ash analyses, have been studied with the mass spectrometer using the Knudsen effusion technique. One slag having initially 15 wt percent CaO yielded a higher K pressure at 10 wt percent K/sub 2/O than a K/sub 2/O-SiO/sub 2/ solution containing 30 wt percent K/sub 2/O. A second slag with relatively high SiO/sub 2/ and AI/sub 2/O/sub 3/ and 13 wt percent K/sub 2/O gave a K pressure above that of a K/sub 2/O-SiO/sub 2/ solution with 20 wt percent K/sub 2/O.
- Research Organization:
- National Bureau of Standards, Washington, DC (USA)
- OSTI ID:
- 7291207
- Report Number(s):
- PB-259851
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ASHES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL ANALYSIS
COAL
DIRECT ENERGY CONVERTERS
ENERGY SOURCES
FOSSIL FUELS
FUELS
MASS SPECTROSCOPY
MHD GENERATORS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
RESIDUES
SILICON COMPOUNDS
SILICON OXIDES
SLAGS
SPECTROSCOPY
010800* -- Coal
Lignite
& Peat-- Waste Management
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ASHES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL ANALYSIS
COAL
DIRECT ENERGY CONVERTERS
ENERGY SOURCES
FOSSIL FUELS
FUELS
MASS SPECTROSCOPY
MHD GENERATORS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
RESIDUES
SILICON COMPOUNDS
SILICON OXIDES
SLAGS
SPECTROSCOPY