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Iron ore sinter is a major source of iron for blast furnace ironmaking in Japan, the component of which is adjusted by mixing several kinds of powdery raw materials. The sinter is formed by melting fine particles and adhering coarser particles with each other by the melt.1) Soma et al.1) have successfully improved the quality of sinter by optimizing the amount and the chemical composition of the melt. Nowadays, chemical compositions of ores have become diverse owing to the deterioration in the quality of ores. As a result, the component-adjustment of raw materials for sinters should be appropriately carried out based on some guideline instead of by trial and error. The guideline for designing sinter could be given by phase diagram: The sintering process is such a short time process that the chemical reactions in sinter never reach the thermodynamic equilibriums. However, the phase diagram could indicate the directions of forward reactions in the sinter during the Liquidus Lines in the Fe-rich Region of the FeOx–CaO–SiO2–Al2O3 System at 1 573 K under Oxygen Partial Pressures between 10 and 10 atm

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Liquidus Lines in the Fe-rich Region of the FeO&lt;sub&gt;x&lt;/sub&gt;-CaO-SiO&lt;sub&gt;2&lt;/sub&gt;-Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; System at 1573 K under Oxygen Partial Pressure between 10&lt;sup&gt;–6&lt;/sup&gt; and 10&lt;sup&gt;–2&lt;/sup&gt; atm