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Investigation was made on the relative reducibility of several sorts of iron ores, sintered ores and other raw materials for blast furnaces by making experiments on direct reduction and indirect reduction of them respectively by coke and CO gas. Then consideration was given on the degree of the reducing action of coke on iron ore, difference in the quantity of carbon deposit in indirect reduction of ores by CO gas and chemical reaction of CO gas on iron ore. In case of direct reduction by coke, difference was found in reducibility of several sorts of ores within the temperature range of under about 900℃, while at higher temperature the rapid reducing reaction was recognized similarly in each ore. Reduction by coke began at low temperature both for hematite and limonite, while for magnetite it occurred at somewhat higher temperatures. In case of indirect reduction by CO gas, reducing reaction appeared at a lower temperature in hematite and limonite than in magnetite (at about 600℃). Carbon deposit was the highest in hematite and appeared within almost certain range of temperature, while in limonite it appeared at various temperatnres, and in magnetite it was very little due to slight reaction. Changing process in the quantity of CO_2 in waste gas could be comparatively clearly recognized in various sorts of ore and for distinguishing the mineral and chemical properties of non-tested ores this method could be effectively applied. Further investigation in future would require on size and quantity of samples for reduction test and on the influence of the condition of flowing CO gas upon reducibility and especially the carbon deposit.
社団法人日本鉄鋼協会の論文
1953-11-25

鐵鑛石の被還元性に就て

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