Reduction Behavior of Carbon Composite Iron Ore Hot Briquette in Shaft Furnace and Scope on Blast Furnace Performance Reinforcement

• Published in: ISIJ International Vol. 43; no. 12; pp. 1904 - 1912
• Main Authors: Matsui, Yoshiyuki, Sawayama, Muneyoshi, Kasai, Akito, Yamagata, Yoshiaki, Noma, Fumio
• Format: Journal Article
• Language: English
• Published: Tokyo The Iron and Steel Institute of Japan 01.01.2003; Iron and Steel Institute of Japan
• Subjects: Applied sciences; blast furnace; carbon composite iron ore briquette; Exact sciences and technology; hot briquetting; innovative ironmaking; Iron and steel making; Ironmaking in blast furnace; Metals. Metallurgy; Production of metals; reaction rate; Coke; Cast iron; Experimental device; Experimental study; Reaction rate; Carbon; Iron ore; Chemical reduction; Lime; Blast furnace charge; Pig iron manufacture; Iron steel industry; Blast furnace performance; Ore briquetting
• ISSN: 0915-1559; 1347-5460
• DOI: 10.2355/isijinternational.43.1904

The reduction and melting behavior of carbon composite iron ore hot briquette in shaft furnace are discussed. As these agglomerates are made by the use of thermal plasticity of coal, the reduction rate by chain reactions in interface between ore and coal could be increased. The carbon composite iron ore hot briquettes achieve 95% reduction degree in about 10-min descent time to the 1100°C heat reserve zone bottom end and the drop of molten iron temperature is kept to 20°C. As a result, it is expected that these new agglomerates could decrease the fuel rate and discharging amount of CO2 as well as have a possibility of extension of furnace life. Finally the paper ends by shaping the future of blast furnace on environmental phases for the new century. Especially, it is expected that carbon composite iron ore hot briquette lowers temperature of heat reserve zone and shortens the length, suggesting the possibility of shortening of the reserve zone (inactivity zone), that is, shortening of the blast furnace height.