METHOD FOR MANUFACTURING SINTERED ORE

• Main Authors: MATSUMURA TOSHIHIDE, MAKI GOJI
• Format: Patent
• Language: English
• Published: 28.05.2009
• 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 provide a method for manufacturing sintered ore, wherein the yield and productivity of the sintered ore can be stably improved with certainty without changing the chemical components of the sintered ore influencing blast furnace operation. SOLUTION: Various fine ores to be blended as a raw material for sintering are classified, according to Al2O3content, into two series [(a high Al2O3content side)=(a first series)(A) and (a low Al2O3content side)=(a second series)(B)]. The respective classified fine ores of the series (A and B) are blended with CaO sources (4A and 4B) and powder fuels (7A and 7B), respectively. The respective blended materials of the series (A and B) are mixed/pelletized (8A and 8B), respectively. The respective pellets of these series are mixed (9) to prepare a whole raw material for sintering, and the whole raw material for sintering is fired (10) to obtain the sintered ore. The method for manufacturing the sintered ore is characterized in that: the basicity (mass ratio, CaO/SiO2) of a fine powder portion with a size of ≤0.5 mm in the blended material of the first series (A) ranges from 4.4 to 7.3; and the mixing ratio between the blended material (excluding returned ore and the powder fuel) of the first series (A) and the blended material (excluding the powder fuel) of the second series (B) ranges from 2:8 to 8:2 by mass ratio. COPYRIGHT: (C)2009,JPO&INPIT