<報文>褐鐵鑛の被還元性に關する二, 三の研究
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First, as preliminary experiments, measurements of spcific gravities, porosities and heat of absorption on dehydration were made on some limonitic iron ores used in this reducibility test. Next, we selected the conditions of reduction test with which ores might encounter in the blast furnace shaft as they travel down through it. The temperature of reducing chamber and ratio of CO : CO_2 in reducing gas were correspondingly changed, considering the actual travelling time of the charge. Thus, the actual furnace conditions were reproduced in the laboratory, and the reducibilities of some limonitic iron ores and also magnetite and hematite were observed for comparison. Conclusions obtained are as follows : (A) The reducibilities of iron ore increased so much with (1) porosity, (2) heat of absorption on dehydration and (3) the increase of oxidation degree but the case was opposite with gan ue minerals especially with their SiO_2-content. (B) Reduction velocity of iron ore in the blast furnace shaft may be assumed to increase with the rise in temperature as they travel downward, but temporarily decrease in the temperature range from 500℃ to 600℃, owing to the carbon deposition phenomena. Hematite can be reduced to the degree nearly equal to limonite until zone of the furnace shaft reached 900〜1,000℃, while magnetite cannot be reduced and so easily and often travelled down to the higher temperature zone of furnace in unreduced state. (C) By speeding up the heating rate of ore, i.e., with faster travelling rate, temperature range of carbon deposition will rise higher and somewhat be wider, but amount of deposited carbon decreased. (D) The maximum charging temperature of the blast furnace charge from the standpoint of reduction and the prevention of disintegration of charged ore, is assumed to be about 500℃. (E) Concerning reduction properties of iron ore only, we can dare say that there is probability of designing rather lower shaft furnace, but it must be pointed out that the shaft part of the furnace also served as the heat exchanger between cold charge and hot gas.
- 1951-10-03
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