CaO・2Fe_2O_3 組成近辺の溶製物の還元に伴う膨張に及ぼす SiO_2, Al_2O_3 添加の影響(焼結鉱)(<特集>製銑技術の拡大と高度化)

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The reduction of CaO・2Fe_2O_3(CF_2) in which SiO_2, Al_2O_3 were added separately or simultaneously and resultant expansion have been studied in CO-N_2(4 : 6) mixed gas at 550℃. The main results obtained are as follows : 1) In melted material of CF_2-SiO_2(SiO_2 : 0.5∿2.0wt%) system, the addition of SiO_2 into CF_2 promotes the formation of 2CaO・SiO_2(C_2S), CaO・Fe_2O_3(CF) and Fe_2O_3. SiO_2 is insoluble in CF_2. The formed Fe_2O_3 increases the reduction and resultant expansion. 2) In melted material of CF_2-CaO(1.87wt%)-SiO_2(SiO_2 : 0.5∿2.0wt%) system, the combined addition of SiO_2 and CaO promotes the formation of CF_2, CF and C_2S. SiO_2 is only slightly soluble in CF. Consequently, the formation of C_2S and the disappearance of Fe_2O_3 restrains the reduction and resultant expansion. 3) In melted material of CF_2-CaO (1.87wt%)-SiO_2 (1.0wt%)-Al_2O_3 (Al_2O_3 : 0.5∿8.0wt%) system, the combined addition of SiO_2, CaO and Al_2O_3 promotes the formation of CF_2-α(SiO_2 : 1.5∿1.8wt%, Al_2O_3 : ≨8.2wt%) and CF_2-β(SiO_2 : 1.5∿1.8wt%, Al_2O_3 : >8.2wt%). Both CF_2-α and CF_2-β restrain the reduction, and the former promotes the resultant expansion, inversely, the latter restrains it.
社団法人日本鉄鋼協会の論文
1987-11-01