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Synopsis : In order to thermodynamically understand the dephosphorization behavior of hot metals , the equilibrium di stribution of phosphorus between a solid iron strip and CaO bearing slag was measured in the temperature from 1200•Ž to 1400•Ž as a function of slag composition, avoiding the possible violent CO evolution if carbon saturated iron were used. The obtained result was then converted to the value for the hot metal system using available thermodynamic data of phosphorus in solid and liquid irons . The results are summarized as follows : 1 ) The CaO -SiO2FeO system has very high dephosphorizing capacity when it is saturated with 2CaO•ESiO2. 2 ) The CaOCaF2FeO system containing a large amount of CaO and CaF2 has high Lp values , where Lp d enotes the distribution ratio of phosphorus between slag and carbon saturated iron . 3 ) When FeO content is low, the CaOSiO2CaF2FeO system containing a large amount of CaO has very high phosphate capacity. 4 ) Iron oxide decreases the phosphate capacity of basic slags. 5 ) From the laboratory equilibration test of the CaO bearing slags used in the practical hot metal treatment, the partial pressure of oxygen at the slag metal interface is estimated at 10-14 •` 10-15 atm , which is ten times as high as that in the soda-ash treatment. This lies between the one determined by the reaction Fe+1 2O2 = FeO and the one by C+1 / 2O2 = CO.

Phosphorus Distribution between CaO-containing Slag and Carbon-saturated Iron at Hot Metal Temperatures