銑鉄中 Si 濃度に及ぼす高炉操業要因の影響に関する反応工学的解析(高炉内反応の基礎とモデル)(<特集>製銑)

概要

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By the use of a mathematical simulation of Si transfer via SiO in the blast furnace, main operational factors affecting Si concentration in pig iron were examined. (1) The concentration ranging from 0.4% up to 2.5% was well simulated on the basis of the operational data of Chiba No.2 and No.3 furnaces. (2) The observed relation between Si concentration and hot metal temperature was clarified by the concept of thermal flow ratio, which gave unified explanation to the relation. (3) In iron production for steelmaking, the main source of SiO was from ash in coke, and the rate determining step of Si transfer into iron was Si absorption by pig iron from SiO. (4) In the case of foundry iron containing more than 2% Si, the amount of SiO generated from flowing-down slag accounted for over 80% of the generated SiO, and Si transfer rate was determined by SiO generation. (5) Simulation of an operation with a low flame temperature in front of the tuyeres was tried, and it was proved that even in such a small furnace as Chiba No.2 furnace (1380 m^3) an operation with 0.2% Si under a hot metal temperature of 1 490℃ was possible by reducing SiO generation from coke ash.
社団法人日本鉄鋼協会の論文
1982-11-01