Abstract
The change law of oxygen activity was studied by using Fe2O3‐CaO‐CaF2 and Na2CO3/Na2SO4 fluxes under laboratory conditions. At the same time, the range of oxygen activity which is in favour of removing phosphorus and sulphur simultaneously was also investigated. The results showed that the oxygen activity in the iron melt during de‐phosphorization can reach up to 5.91×10−6~10.03×10−6 in about 5 min and then only varies within a narrow range. A final phosphorus content of 0.008% and a final sulphur content of 0.003% can be obtained if the oxygen activity is controlled within the range of 4.5×10−6~8.0×10−6.
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