| 摘要 |
<p>The amounts of a CaO-containing substance, an MgO-containing substance, and a SiO<SUB>2</SUB>-containing substance, contained in a raw material mixture, are adjusted such that manufacturing operation is performed with the slag basicity (CaO+MgO)/SiO<SUB>2 </SUB>of 1.3 to 2.3, and with MgO-concentration of 5 to 13% by mass as to the slag composition, which are dependent upon the concentration of each of CaO, MgO, and SiO<SUB>2</SUB>, contained in the raw material mixture. This provides a manufacturing method for high-quality granulated metallic iron with low sulfur concentration, wherein a raw material mixture containing an iron-oxide-containing substance such as iron ore and a carbonaceous reducing agent such as a carbon material are subjected to reducing and melting with a moving hearth-type reducing furnace while suppressing sulfur concentration as much as possible, generated in the granulated metallic iron, particularly due to the carbon material such as coal.</p> |
