Corrosion of refractories in synthetic coal slags

Conference · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5434679

Greenberg, S; Poeppel, R B; Chen, J

The effects of slag temperature and slag velocity on the corrosion of chromia-containing refractories were studied in a rotating-cylinder test furnace. In this furnace, 1-in.-diameter x 1-in.-high refractory cylinders are rotated at a controlled velocity (50 to 150 rpm) in slag of known composition, under controlled temperature (1500 and 1600/sup 0/C) and oxygen partial pressure (approx. 10/sup -9/ atm) conditions. Refractories containing 60 to 80% Cr/sub 2/O/sub 3/ showed negligible corrosion at 1500/sup 0/C. At 1600/sup 0/C, significant differences between refractories of similar composition were apparent, particularly at high rotational speeds. Subtle mineralogical differences among the various high-chromia refractories are the apparent cause of the differences in corrosion rates. Low-chromia (10% Cr/sub 2/O/sub 3/) refractories showed greatly accelerated corrosion rates in comparison with the high-chromia refractories. In a complementary study, the rotating-cylinder test furnace was modified to enable measurement of the viscosity of slags as functions of composition, temperature, and oxygen partial pressure. The results indicate that, in general, sensitivity of viscosity to oxygen partial pressure increases with increasing iron concentration in the slag. Published correlations are, in general, not applicable to the slags investigated in this study. Under the conditions of equilibrium achieved in this study, no hysteresis effects were observed.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5434679
• Report Number(s): CONF-831199-2; ON: DE84003616
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
CORROSION
CORROSIVE EFFECTS
DATA
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PARTIAL PRESSURE
REFRACTORIES
SLAGS
TEMPERATURE DEPENDENCE
TEST FACILITIES
TRANSITION ELEMENT COMPOUNDS
VELOCITY
VISCOSITY