METHOD OF PRODUCING SINTERED ORE RAW MATERIAL USING MAGNETITE ORE

• Main Authors: MATSUMURA TOSHIHIDE, MIYAGAWA KAZUYA, ANO KOJI, ADACHI TAKERO
• Format: Patent
• Language: English; Japanese
• Published: 21.07.2016
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To maintain the strength of sintered ore comprising a sintering raw material and improve the reducibility of the sintered ore even if magnetite ore is used.SOLUTION: When a sintering raw material is produced using magnetite ore, the magnetite ore is used in an amount of not more than 30 mass% (not including 0%) in a new raw material. Chemical components of FeO, Free C, CaCO, and CW (crystal water) in the total raw material satisfy [32792×(Free C, mass%)-1791×(CaCO, mass%)-5274×(CW, mass%)]×0.4+1604×(FeO, mass%)×0.48<29500, and further satisfy [32792×(Free C, mass%)-1791×(CaCO, mass%)-5274×(CW, mass%)]×0.4+1604×(FeO, mass%)×0.8>24000.SELECTED DRAWING: Figure 8 【課題】マグネタイト鉱石を用いたとしても、焼結原料から構成される焼結鉱の強度が維持可能で、焼結鉱の被還元性を向上させることができるようにする。【解決手段】マグネタイト鉱石を用いて焼結鉱原料を製造するに際し、マグネタイト鉱石を新原料中で３０質量％以下（０％を含まない）を使用する。全原料中のＦｅＯ、ＦｒｅｅＣ、ＣａＣＯ３、ＣＷ（結晶水）の化学成分が、［３２７９２×(ＦｒｅｅＣ,質量%)−１７９１×(ＣａＣＯ３,質量%)−５２７４×(ＣＷ,質量%）］×０．４＋１６０４×(ＦｅＯ,質量%)×０．４８＜２９５００を満たす。加えて、［３２７９２×(Ｆｒｅｅ Ｃ,質量%)−１７９１×(ＣａＣＯ３,質量%)−５２７４×(ＣＷ,質量%）］×０．４＋１６０４×(ＦｅＯ,質量%)×０．８＞２４０００を満たす。【選択図】図８