Raw Material Feeding and Its Influence on Operation Performance of Smelting Reduction Process with a Large Amount of Slag

• Published in: ISIJ International Vol. 33; no. 3; pp. 376 - 384
• Main Authors: Katayama, Hiroyuki, Ohno, Takamasa, Yamauchi, Masao, Kawamura, Takafumi, Hirata, Hiroshi, Matsuo, Mitsitaka
• Format: Journal Article
• Language: English
• Published: The Iron and Steel Institute of Japan 01-01-1993
• Subjects: coal; feeding; injection; iron ore; smelting reduction
• ISSN: 0915-1559; 1347-5460
• DOI: 10.2355/isijinternational.33.376

In order to know the necessary conditions of pretreatment of raw materials and feeding technologies, fine ore and highly volatile coal were supplied to the smelting reduction furnace directly, and the relation between feeding conditions and operation performance was investigated. Fine materials were supplied by injection into the metal bath or by pouring with a small amount of carrier gas from above the slag layer. In injection, excessive stirring of bath causes the decrease of post combustion and the increase of iron dust generation. For fine ore, it is possible to supply by pouring with negligible carry-over, by keeping the specific surface area of a stream small. When coal is supplied directly, volatile matter influences the post combustion, coal consumption and the amount of carry-over of carbon. It is possible to operate a smelting reduction furnace with direct addition of coal by suppressing carry-over, but pretreatment for decreasing coal consumption further was discussed.