The Effect of CaFsub 2 on Thermodynamics of CaO-CaFsub 2-SiOsub 2(-MgO) Slags

To address the role of CaF2 in the CaO-CaF2-SiO2(-MgO) slag system employed for the production of low-pressure rotor steels, the thermodynamic aspects of the slag were investigated by equilibrating it with liquid iron at 1873 K in CaO or MgO crucibles. Presaturation of slag with an oxide block piece...

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Bibliographic Details
Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2004-02, Vol.35B (1), p.115-120
Main Authors: Choi, Chul-Hwan, Jo, Sung-Koo, Kim, Seon-Hyo, Lee, Kwang-Ro, Kim, Jeong-Tae
Format: Article
Language:English
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Summary:To address the role of CaF2 in the CaO-CaF2-SiO2(-MgO) slag system employed for the production of low-pressure rotor steels, the thermodynamic aspects of the slag were investigated by equilibrating it with liquid iron at 1873 K in CaO or MgO crucibles. Presaturation of slag with an oxide block piece of CaO or MgO in a Pt crucible and application of a carbon paste to the outside of an oxide crucible were designed to prevent crucible failure during the slag-metal experiments. The liquidus isotherm and phase boundary of the preceding slag system were investigated using the slag-metal equilibria. Also, the effect of CaF2 on the sulfide capacity and the activity coefficient of FetO were of particular interest in controlling the sulfur level and cleanliness of low-pressure rotor steels.
ISSN:1073-5615