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Generally speaking phosphorus is a harmful element for steel. It could cause embrittlement.1–3) In order to meet the requirement of high quality steel, phosphorus should be removed as much as possible. The CaO–SiO2–FeOx slag system is commonly used for BOF process, and usually extra CaO is added to remove phosphorus from molten hot metal and steel. Due to the unreacted CaO, the BOF slag is difficult to be reused meanwhile the amount of slag increases. Although fluorite could enhance CaO dissolution into slag, use of fluorite is restricted due to its toxicity for human and environment. Recently, multi-phase fluxes are adopted in the hot metal dephosphorization process, in which di-calcium silicate and tri-calcium phosphate could form a solid solution over a wide composition range at the steelmaking temperature range as reported by Fix et al.4) Suito and Inoue5) confirmed the existence of 2CaO∙SiO2-3CaO∙P2O5 solid solution during the reaction between solid CaO and CaO–FetO–P2O5(–SiO2) slag. The 2CaO∙SiO2-3CaO∙P2O5 solid solution was found between the solid CaO and CaO–FetO–P2O5(–SiO2) slag. They also studied the phosphorous transfer behavior from CaO–FetO–P2O5(–SiO2) slag to 2CaO∙SiO2 particles6) and the phosphorous partition between 2CaO∙SiO2 particles and CaO–SiO2–FetO slag with the similar experimental method.7) Kitamura et al.8) studied the mass transfer of P2O5 between CaO–SiO2–FeO–P2O5 slag and 2CaO∙SiO23CaO∙P2O5 solid solution by immersing 2CaO∙SiO2 or 3CaO∙P2O5 rod into CaO–SiO2–FeO–P2O5 slag for various Activity of P2O5 in Solid Solution between Di-calcium Silicate and Tri-calcium Phosphate at 1 823 and 1 873 K

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Activity of P&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; in Solid Solution between Di-calcium Silicate and Tri-calcium Phosphate at 1823 and 1873 K