Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Mass Spectrometric Determination of Interaction Parameters for P2O5 with CaO, MgO, MnO and SiO2 in FetO-P2O5 System
Nobuaki OHARAShinya NUNOUEEiichi KATO
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1987 Volume 73 Issue 10 Pages 1337-1342

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Abstract

The effects of CaO, MgO, MnO and SiO2 on the activity coefficient of P2O5 in dilute solution of P2O5 in FetO were determined at 1370°C by the use of a mass spectrometer-Knudsen cell combination. The activity of P2O5 was determined by the use of the following chemical equilibrium. Iron vapor in equilibrium with solid iron was used as internal standard.
PO ( g )+ P2O5( in slag ) = 3PO2(g)
aP2O5 = K·P3PO2PPO=K'·(I+PO2/I+Fe)3(I+PO/I+Fe)
The interaction parameters have been calculated from the activity coefficient of P2O5 with the aid of the least square method. The obtained results are as follows.
εCaOP2O5 = - 23 ± 3 εMgOP2O5 = - 20 ± 2
εMnOP2O5 = - 13 ± 1 εSiO2P2O5 = - 4 ± 1
These interaction parameters are for dilute solution of P2O5 in FetO.

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© The Iron and Steel Institute of Japan
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