CaO-Fe_2O_3 二元系カルシウムフェライトの還元過程とそれに伴う膨張

概要

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The reduction process of artificial 2CaO・Fe_2O_3, CaO・Fe_2O_3 and CaO・2Fe_2O_3 by CO-CO_2 mixed gas and the accompanied expansion have been studied in connection with the behaviour during reduction of lime self-fluxing sinter. The main results obtained are as follows : (1) A scheme of reduction process of CaO・2Fe_2O_3, CaO・Fe_2O_3 and 2CaO・Fe_2O_3 at 800°, 900°, 1000℃ (solid line) and 550℃ (chain line) was found as follows : [figure] (2) At 800°, 900°, and 1000℃, the expansion (about 0.8%) in the reduction of CaO・2Fe_2O_3 and CaO・Fe_2O_3 occurred up to formation of 2CaO・Fe_2O_3, CaO・3FeO・Fe_2O_3 and Fe_XO, and the expansion in the case of 2CaO・Fe_2O_3 was only small. (3) At 550℃, the abrupt expansion (about 4%) in the reduction of CaO・Fe_2O_3 may be caused by formation of metallic iron and carbon deposition incidental to its formation, and that the expansion in the reduction of CaO・2Fe_2O_3 occurred in two steps ; the first step expansion (about 0.8%) occurred up to formation of Fe_3O_4 and the second abrupt expansion may be caused by the same reason as in CaO・Fe_2O_3. (4) At each temperature, the expansion of Fe_2O_3 was the highest and the expansion of calcium ferrite was much less than Fe_2O_3, and the expansion of binary calcium ferrite increased with increasing Fe_2O_3 content in ferrite.
社団法人日本鉄鋼協会の論文
1983-09-01