Acceleration of Carburization and Melting of Reduced Iron in Iron Ore–Carbon Composite Using Different Types of Carbonaceous Materials

Morphology Change and Carburization Characteristic of Iron Ore-Coal Composite During Reduction under a Simulated Condition of Blast Furnace

“…It is because the reducing agent exists not only from the coal mixed in the composite but also the upward CO atmosphere from the lower part of BF. Referring to the references, 10,12,13) when composite reacted under inert gas atmosphere, C/O ratio in the range of 0.8 to 1.0 were enough to convert the reduction degree over 90%. Here, the composite was subject to reduction under CO reducing atmosphere, it was supposed the suitable C/O ratio was at the relative lower level.…”

“…Noted that in order to measure the carbon content both in as-reduced iron and in metallic iron, the samples were conducted the separation procedure as following. 10) Firstly, the sample was cooled in liquid nitrogen and then was quickly pulverized by a mortar. One part of powder was taken to measure its carbon content which was recognized as total carbon amount in the reduced iron.…”

“…Besides, the strength of iron ore-carbon is the same important with other burden materials such as sinter, pellet or lump ore during the reduction period. Murakami et al 10) reported that applying two different types of carbonaceous materials on composite are able to improve not only the reduction but also the carburization. One type of carbonaceous is coal or charcoal, which is suitable for the reducing agent because it can generate the reducing gases at lower temperature.…”

Interface Behavior and Interaction Mechanism between Vanadium-Titanium Magnetite Carbon Composite Briquette and Sinter in Softening-Melting-Dripping Process

“…(Received on June 2, 2020; accepted on August 12, 2020; J-STAGE Advance published date: November 22,2020) As an innovative and promising BF iron-bearing burden, the vanadium-titanium magnetite carbon composite briquette (VTM-CCB) charging significantly affects the softening-melting-dripping characteristics and cohesive zone of the mixed burden. In this study, the interface behaviors between VTM-CCB and sinter were investigated by conducting interrupted softening-melting experiments to elucidate intrinsic structure evolution and interaction mechanisms.…”

Reaction Behaviors of Various Agglomerates in Reducing the Temperature of the Thermal Reserve Zone of the Blast Furnace

“…Figure 11 shows the relationship between CCR and the reduction degree of CCA during the BIS test, together with the molar ratios of consumed carbon to reduced oxygen. Because CCA was completely reduced at low temperature (1 035°C), the carbon consumption was assumed to occur only because of gasification until the end of reduction, by referring to past investigations that reported a slight carburization of the formed iron, i.e., 2.0 wt% at 1 300°C 25) and 0.1 wt% at 1 100°C. 26) The insignificant vales of carbon consumption until achieving 30% of reduction degree showed that CCA was reduced only by CO in the surrounding bulk gas.…”