二酸化チタンの還元(第 1 報)

概要

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Reduction tests on pure titanic oxide with hydrogen, carbon monoxide and solid carbon within or without the stream of nitrogen gas were carried out under the same procedure. At first, the author quoted the leading conclusions that have previously been proposed about this problem and gave a brief discussion. The range of temperature of 400°-1, 200℃ and 700°-1, 200℃ was adopted respectively for the reduction in the case of hydrogen and carbon monoxide gases, and pure solid carbon. The pure carbon being prepared by the ignition of purified sugar carbon in the current of dry chlorine gas. From the results obtained, it was shown that the reduction of precipitated titanic oxide began at above 400℃ with hydrogen and carbon monoxide gases, and above 500℃ with solid carbon. Higher the temperature of reduction and longer the duration, the higher percentage of reduction resulted. And the rate of reduction was retarded following to the order as C, H_2, CO in the higher temperature, H_2, CO, C in the lower and C, CO, H_2 in the intermediate. Among the varied physico chemical properties of the reduced products the formation of nitride was clearly observed. The colour of these products changes generally with respect to their reduction-gradients. The author has also determined the any kinds of lower oxides to be produced and gave the suitable analytical procedure for their determination.
社団法人日本鉄鋼協会の論文
1931-12-25