Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Thermodynamics and Kinetics of Hot Metal Dephosphorization by CaO based Slag Containing CaF2
Yoshihiko KAWAIHideo NAKAMURAKiminari KAWAKAMITakeharu TOYODAAkira ISHIZAKATsutomu EBISAWA
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1983 Volume 69 Issue 15 Pages 1755-1762

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Abstract

Thermodynamics and kinetics of hot metal dephosphorization reaction have been studied for the slags containing 10 to 50% CaF2 in the quasi-ternary CaO-SiO2-CaF2 system.
From the fundamental experiments, an equation with respect to phosphorus partition equilibrium was derived and the thermodynamic effect of CaF2 addition was discussed. It was indicated that the increase in the activity of (FeO) was one of the main reasons of achieving high phosphorus partition ratio by CaF2-containing slag.
The rate controlling step of dephosphorization reaction was determined to be the supply of oxygen, in the form of (FeO), to the reaction interface.
Based on the result of the fundamental experiments, 250 t scale test has been carried out, and it is considered that the hot metal dephosphorization treatment with the slag in CaO-SiO2-CaF2 system is beneficial for the production of high quality steel with less phosphorus content.
In terms of the mass production, the process is likely to be more promising, with the improvement of the acceleration of dephosphorization reaction rate.

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© The Iron and Steel Institute of Japan
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