ON THE PROPERTIES OF IRON MADE BY THE PROCESS OF HYDROGEN REDUCTION

Abstract

Some years ago, the author has published on the foundamental investigation of the reduction of iron ores by hydrogen, on the Meiji Senmon Gakko Gahuho and the Journal of Iron and Steel Institute. In this investigation he made the experiment of reduction by hydrogen on the different kinds of ore, from 2, 000 to 5, 000 grams to investigate the properties of melted iron produced from the reduced iron. He determined proper temperature and time of the reduction in nearly industrial scale using the iron sands from Sanin and Kuji, and the iron ores from Taihei, Johole, Tochu, Ansan and the mill scales. The sponge iron after reduction was made as brickets under the pressure, 2 tons per square inch. From 1kg, to 1·5kg. of the brickets is melted in an electric resistance furnace made by carbon-tube and cast as ingot. The phenomena of the melting was observed, and the degree of the reduction of phospkorus and sulphur was estimated, also, the impurities in the iron was analysed.
The ingot iron obtained by the melting was forged after heating and compared the physical properties of the iron produced by different kind of ores
Generally, it is known, in the blast furnace working, that nearly all the phosphorous in the charge is reduced and goes into the pig iron and it is impossible to remove the phosphorous into the slag. But, in this e all the phosphorous is not reduced on account of low temperature of reduction and the ureduced phosphorous which exist as its oxide is removed in the slag during the melting. It is recognized that the degree of reduction changes by the temperature of reduction. To confirm this phenomena, the high phosphorous iron ores, Taihei and Johole is reduced in different temperatures between 600°C and 1, 100°C and investigated the phosphorous content in the iron and slag obtained by the melting of the sponge iron to observe the influence of the temperature on the reduction of phosphorous.