Slag and metal oxide vaporization in reactive atmospheres

Journal Article · Tue Jan 01 04:00:00 EST 1980 · High Temp. Sci.; (United States)

OSTI ID:6041867

Hastie, J W; Bonnell, D W; Plante, E R

Metal oxides, whether they are present in the form of refractory ceramics or slags, are key components of high temperature energy systems. Planned magnetohydrodynamic (MHD) and coal gasifier systems are particularly dependent on the thermochemical properties of ceramic and slag materials. However, almost no basic thermochemical data exist for oxides in the presence of high temperature-high pressure reactive gases such as H/sub 2/O. The present study utilizes a modification of the now classical Knudsen effusion mass spectrometric technique and a new technique, transpiration mass spectrometry, for molecular-level thermochemical analysis of MgO and a potassium enriched MHD coal slag in the presence of H/sub 2/O vapor and related gases. New data are presented for the enthalpy of formation of MgOH (..delta..H/sub f,298/ = -35.8 +- 3.0 kcal/mol). Species partial pressures and derived activity coefficients are given for a potassium enriched Illinois number 6 coal slag over a range of K/sub 2/O content (15.4 to 8.0 mol %) and temperature (1100 to 1820/sup 0/K). Data on the effect of H/sub 2/O vapor on alkali vapor transport are also given.

• Research Organization: National Bureau of Standards, Washington, DC
• OSTI ID: 6041867
• Journal Information: High Temp. Sci.; (United States), Journal Name: High Temp. Sci.; (United States) Vol. 13:1; ISSN HITSA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600 -- Coal
Lignite
& Peat-- Properties & Composition
30 DIRECT ENERGY CONVERSION
300104 -- MHD Generators-- Duct Engineering & Fluid Dynamics
36 MATERIALS SCIENCE
360600* -- Other Materials
ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
CARBONACEOUS MATERIALS
CHALCOGENIDES
COAL
COAL-FIRED MHD GENERATORS
DIRECT ENERGY CONVERTERS
ELEMENTS
ENERGY SOURCES
EVAPORATION
FLUID FLOW
FLUIDS
FOSSIL FUELS
FUELS
GAS FLOW
GASES
HYDROGEN COMPOUNDS
HYDROXIDES
KNUDSEN FLOW
MAGNESIUM COMPOUNDS
MAGNESIUM HYDROXIDES
MAGNESIUM OXIDES
MASS SPECTROSCOPY
MATERIALS
METALS
MHD GENERATORS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POTASSIUM
SEED-SLAG INTERACTIONS
SLAGS
SPECTROSCOPY
THERMODYNAMIC PROPERTIES
TRANSPIRATION
VAPOR PRESSURE
VAPORS
WATER VAPOR