Abstract
The activity of oxygen in liquid iron-phosphorus alloy and equilibrium of phosphorus-oxygen in liquid iron in contact with a mixture of solid tetracalciumphosphate and calcium, oxide was studied inia controlled atomosphere of H2-H20 gas mixture.
The results obtained were summarized as follows;
H2(g)+O=H2O(g)
log K=8, 180/T-3.83
ΔG°=-37, 400+17.5T (1500-1650°C)
2P+4CaO(s)+5H2O(g)=4CaO·P2O5(s)+H2(g)
log K=61, 300/T-26.7
ΔG°=-281, 000+122T (1540-1600°C)
2P+4CaO(s)+5O=4CaO·P2O5(s)
log K=96, 600/T-42.9
ΔG°=-442, 000+196T (1540-1600°C)
e(P)O=0.03(0.05-2.0%P), e(O)P=0.05
e(P)P=+0.01--0.04 (0.05-2.0%P)
