ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Desulfurization and Simultaneous Desulfurization and Dephosphorization of Molten Iron by Na2O–SiO2 and Na2O–CaO–SiO2 Fluxes
Hikoya IwaiKyoji Kunisada
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1989 Volume 29 Issue 2 Pages 135-139


Desulfurization and simultaneous desulfurization and dephosphorization of molten iron were made by the use of Na2O–SiO2 and Na2O–CaO–SiO2 fluxes at 1 600°C.
The degree of desulfurization increased with increasing Na2O/SiO2 ratio and NaF content in the fluxes, whereas the degree decreased by the addition of CaO. Both of the reactions of desulfurization and dephosphorization took place simultaneously by the use of Na2O–CaO–SiO2 fluxes. The degree of dephosphorization was over 80% and not affected by the Na2/O/CaO ratio of the fluxes, whereas the degree of desulfurization considerably decreased with increasing content of CaO (decreasing the Na2O/CaO ratio). Some discussions were made on the sulfur and phosphorus partitions obtained at the end of runs.

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© The Iron and Steel Institute of Japan
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