鐵鑛石間接還元難易の理由に關する二三の研究
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The reducing velocities by CO gas were tested for a kind of limonite ore, 5 kinds of hematite ores, 4 kinds of magnetite ores and a kind of heating furnace cinder. Each ore was equally granulated in about 1m.m. dia. and 1c.c. of the granulated sample was taken in each experiment. 100c.c. of the mixed gas of CO(35%) and N_2(65%) per min. were passed for some hours through the sample which was kept at 800℃. or 1000℃. in an electric resistance furnace. The % of CO_2 in the exhausted gas from the sample was analysed every 10 mins. The amount of CO_2 indicated the amount of the oxygen taken from the iron ore, and thus the reducing velocities of the various ores were calculated. The reducing velocities of the limonite and hematite ores which contained not much silica, were more rapid than those of the magnetite ores and the heating furnace cinder, the velocity of the last being the slowest. Also the reducing velocities from Fe_3O_4 to FeO and those from FeO to (Fe. FeO) were compared in each ore and averaged. Averaging the ores which contained over 50 % of iron (51 to 70 % Fe) it was seen that the reducing velocity (at 1000℃. or 800℃) from Fe_3O_4 to FeO was about 2.2 times (1.4 to 3.1 times) greater than that from FeO to (Fe.FeO) and the ratio was greater for the siliceous hematite ores compared with the hematite ores which contained not much silica. Again the degree of the increment of the reducing velocities of the various ores at 1000℃. against that at 800℃. was compared, and it was found that the degree of the increment for the magnetite ores was much greater than that of the hematite ores. The conditions of easily reducible ore were ascertained from our experiment.
- 社団法人日本鉄鋼協会の論文
- 1931-04-25
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