Oxygen Potentials in Liquid Pig Iron and Slag and Analysis of Reactions in Blast Furnace by Means of Affinities in the Reactions

Nagata, Kazuhiro; Tsuchiya, Nobuo; Sumito, Mitsuo; Gotō, Kazuhiro

doi:10.2355/tetsutohagane1955.68.15_2271

Cited by 8 publications

(1 citation statement)

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“…Because the melting point of oxide and pig iron are influenced by the concentrations of iron oxide and carbon, respectively, the oxygen potential is correlated to liquid forming. 45,46) In the arrangement shown in (c), the solid-liquid coexistence cohesive region shifted to the lower part of the blast furnace due to the high reduction degree of the ore layer. On the other hand, it was estimated that ores with a low reduction degree in the mixed layer extend the solid-liquid coexistence cohesive region.…”

Section: Reduction Degree Distribution For Each Ore Particlementioning

confidence: 99%

Effect of High Reactivity Coke for Mixed Charge in Ore Layer on Reaction Behavior of Each Particle in Blast Furnace

et al. 2013

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A low coke rate operation in blast furnace is desired to decrease the carbon input and mitigate global warming problem. However, low coke rate operation tends to cause the gas permeability to deteriorate. The mixing of small-size coke (nut coke) including high reactivity coke in ore layer is considered to be a promising way to improve permeability and increase reaction efficiency in a blast furnace. Although adding a nut coke mixing to an ore layer is predicted to be empirically effective in low coke rate operation, there is little actual data on microscopic phenomena of each particle in the packed bed. In the present study, an Euler-Lagrange approach was introduced to precisely understand the influence of the packed bed structure on the reaction behavior of each particle in the three-dimensional particle arrangement.It was observed that the heterogeneity on the reaction rate and temperature distribution was influenced by the particle arrangement. When high-reactivity coke was used at approximately 1 273 K, although CO gas fraction increased, the gaseous phase temperature decreased due to the active solution loss reaction rate of the nut coke in the mixed layer. As a result, the ore reduction rate decreased. The contribution of high-reactivity coke to the ore reduction rate depends on the particle arrangement through the heat transfer and reaction heat. Accordingly, in the case of the mixed charge of the high reactivity nut coke in the ore layer, the design of the packed bed structure is important.

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Section: Reduction Degree Distribution For Each Ore Particlementioning

confidence: 99%