Effect of its Charging Condition and Sintering Gas Velocity on Metallic Iron Productivity of Partially Reduced Agglomerates Production in Packed Bed with Air Flow

In order to improve the metallic iron (M Fe) productivity of partially reduced agglomerates production in packed bed with air flow, the packed bed of which the carbon composite iron ore green balls were charged lower side and the ordinary raw materials are charged on them called lower charging were examined The M Fe productivity of lower charging were compared with that of the packed bed in which the carbon composite iron ore green balls were mixed with the ordinary raw materials and charged, called mixed charging Also, the effect of exhaust gas velocity during sintering was studied As a result the M Fe productivity of lower charging was higher than that of mixed charging because reduced agglomerates placed upper side of the packed bed were easier to be re oxidized In addition, when the exhaust gas velocity was too slow the time for re oxidization was extended so that the M Fe productivity decreased However, when the exhaust gas velocity was too fast, the excess of free C combustion or re oxidization of reduced agglomerates was caused so that the M Fe productivity decreased, too Therefore there is a exhaust gas velocity which make the M Fe productivity be highest In this study the M Fe productivity achieved 021 M Fe t/m(2)/h with lower charging and 0 19 Nm/s of exhaust gas velocity