高炉操業に及ぼすスラグAl_2O_3成分の影響(高炉内基礎現象および操業技術,高炉その1,<特集号>製銑プロセスの環境調和・資源対応力強化を目指して)

概要

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Increasing the Al_2O_3 content in the blast furnace slag, the blast furnace operations tend to make troubles such as excess accumulation of molten slag in the blast furnace hearth and increasing pressure drop at the lower part of the blast furnace. So, it will be important to keep good slag fluidity at the blast furnace operations such as, drainage of tapping and keeping good permeability. In order to clarify the effect of high Al_2O_3 slag fluidity on the blast furnace, high Al_2O_3 slag (20%) test operations of experimental blast furnace have been carried out. Investigation results of the test operation are as follows; 1) Slag MgO improves the hearth drainage rate at high Al_2O_3 slag operation. 2) Permeability of the dripping zone is improved by decreasing slag CaO/SiO_2, at high Al_2O_3 slag operation of the blast furnace. 3) It was verified that the slag drainage phenomena were able to described by the fluid model. 4) The optimum composition of high Al_2O_3 slag of the blast furnace is high MgO and low CaO/SiO_2.
社団法人日本鉄鋼協会の論文
2006-12-01