Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Oxidation Behavior of Silicon, Phosphorus and Vanadium in Carbon-saturated Iron Melt by Sodium Carbonate
Ryo INOUEHideaki SUITO
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1983 Volume 69 Issue 8 Pages 951-958

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Abstract

From an experiment that Na2CO3 reacted with solid Fe-54% V alloy at 1100°C, the following equation was derived for the reaction of vanadium oxidation by soda ash.
Na2CO3+ 4/5V= Na2O+ 2/5V2O5+ C
Vanadium valencies in the soda flux (Na2CO3, Na2CO3-FeO) reacting with carbon-saturated iron melt have been examined as a function of time. The V2O5 produced by the above equation was found to gradually reduced by carbon and/or silicon, changing to the valency V5+→V4+→V3+. The reduction rate of vanadium oxide was reduced by the addition of iron oxide.
The oxidation behavior of phosphorus, vanadium, and silicon in carbon-saturated iron melt has been studied by use of soda flux (Na2CO3, Na2CO3-Fe2O3) at 1300°C. The oxidation of phosphorus and vanadium were initially retarded if a small amount of flux was added by installments and after the end of flux addition the reversion of phosphorus and vanadium occurred. In comparison with the results obtained in the addition of soda flux by a lump, the retardation of initial oxidation was explained by the fact that the reversion rate of phosphorus and vanadium was considerably fast. The effect of Fe2O3 addition to the flux was found to be significant in both experiments using a lump and installment additions. The extensive removal of vanadium was observed in the addition of Fe2O3 by installments, while neither dephosphorization reaction nor the vanadium reversion took place. The same oxidation behavior found in the Na2CO3-Fe2O3 flux was obtained in an experiment using the CaO-CaF2-Fe2O3 flux.

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© The Iron and Steel Institute of Japan
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