FIRED PELLET FOR REDUCTION AND METHOD FOR PRODUCING THE SAME

• Main Authors: IGAWA DAISUKE, HIGUCHI TAKAHIDE, FUJIWARA SHOHEI, MORITA YUYA, YAMAMOTO TETSUYA, HIROSAWA TOSHIYUKI, HOTTA KANEYA, TAKEHARA KENTA, IWAMI TOMOJI
• Format: Patent
• Language: English; Japanese
• Published: 11.01.2023
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

To provide a fired pellet that is used in a solid reduction furnace and is blended with a specific amount of high-viscosity slag component during its production, so that the risk of mutual contact between low-melting-point slag is reduced to prevent the fusion: thus, the fired pellet is effective in preventing clustering, and a method for producing the same.SOLUTION: The present invention provides a fired pellet for reduction in which the ratio of high-viscosity slag component (Al2O3+MgO+SiO2) to the total Fe (T.Fe) satisfies the formula: (Al2O3+MgO+SiO2)/T.Fe≥0.09 and a method for producing the same, where, Al2O3 denotes the content (mass%) of the component Al2O3 in the fired pellet, MgO denotes the content (mass%) of the component MgO in the fired pellet, SiO2 denotes the content (mass%) of the component SiO2 in the fired pellet, and T.Fe denotes the content (mass%) of the component T.Fe in the fired pellet.SELECTED DRAWING: Figure 1 【課題】固体還元炉で用いる焼成ペレットの製造に当たり、所定量の高粘性のスラグ成分を含有させることで、低融点スラグどうしの接触機会を減らして、融着を阻止することでクラスタリングの防止に有効な焼成ペレットとその製造方法を提案する。【解決手段】トータルＦｅ（Ｔ．Ｆｅ）に対する高粘性のスラグ成分（Ａｌ２Ｏ３＋ＭｇＯ＋ＳｉＯ２）の割合が、式；（Ａｌ２Ｏ３＋ＭｇＯ＋ＳｉＯ２）／Ｔ．Ｆｅ≧０．０９を満たすものである還元用焼成ペレットとその製造方法。ただし、Ａｌ２Ｏ３：焼成ペレット中のＡｌ２Ｏ３の成分濃度（質量％）、ＭｇＯ：焼成ペレット中のＭｇＯの成分濃度（質量％）、ＳｉＯ２：焼成ペレット中のＳｉＯ２の成分濃度（質量％）、Ｔ．Ｆｅ：焼成ペレット中のＴ．Ｆｅの成分濃度（質量％）【選択図】図１