Abstract
In the present work, a modified thermal analysis technique was used for studying the heat effect of slag foaming with carbonates addition. Experiments were conducted by sinking limestone and dolomite pieces of defined shapes (together with iron sinkers) in molten slag and monitoring the temperature changes accompanying the decomposition of carbonates. The heat effects of dolomite and limestone decompositions were determined at 1623 K (1350 °C) and 1673 K (1400 °C). It was found that the decomposition energy for dolomite and limestone for the studied slag composition is in the range of 56 to 79 pct of theoretical values, which is linked to the energy-saving effect of slag foaming. No influence of sample shape on decomposition energy was found for both limestone and dolomite.
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Abbreviations
- Q :
-
the amounts of energy (J)
- ΔH :
-
an enthalpy change (J mol1)
- H T :
-
a substance enthalpy at the temperature T (J mol−1)
- n i :
-
stochiometric coefficient for i substance
- q :
-
irradiation heat flux power (W)
- F ij :
-
view factor from A i to A j area
- σ :
-
Stefan–Boltzmann’s constant, 5.67 ×10−8 (W m−2 K−4)
- S :
-
surface area (m2)
- A :
-
an area of the projection (m2)
- T :
-
temperature (K)
- R :
-
sphere radius (m)
- R c :
-
crucible radius (m)
- r :
-
distance to the sphere center (m)
- t :
-
time (s)
- κ :
-
thermodiffusivity coefficient (m2 s−1)
- K :
-
thermal conductivity (W m−1 K−1)
- ρ :
-
density (kg m−3)
- C p :
-
heat capacity (J mol−1 K−1 or J kg−1 K−1)
- a, b, c and d:
-
the terms in the heat capacity equation (J/K2 mol, J/K3 mol, J/mol, J/K4 mol, respectively)
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Acknowledgments
The authors are thankful to the Swedish Institute and Swedish Strategic Foundation for Environmental Research (MISTRA), project no. 88032 financed by the Swedish Steel Producers Association (Jernkontoret) for financial support, and to Dr. Lidong Teng and Professor A.K. Lahiri for fruitful discussions and suggestions.
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Manuscript submitted March 9, 2010.
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Chychko, A., Seetharaman, S. Foaming in Electric Arc Furnace Part I: Laboratory Studies of Enthalpy Changes of Carbonate Additions to Slag Melts. Metall Mater Trans B 42, 20–29 (2011). https://doi.org/10.1007/s11663-010-9447-4
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DOI: https://doi.org/10.1007/s11663-010-9447-4