鐵鋼珪素の比色分析法の研究

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Heretofore the chemical analysis of the silicon in iron and steel has been limited to the weight analysis alone which is not suitable for the rapid determination. In view of this point, the authors began to study a method of the rapid colorimetric analysis. From the result of experiments on cast steel with the Leitz's triple colorimeter, the precision grade was found to be equal to the weight analysis as well as the time required became about one-third of the time in the latter method. Gist of the method of analysis is as follows : 2.5_g of the sample was dissolved in the nitric acid (1.2), the solution of which was heated and added with a little excess of the saturated solution of potassium permanganate by dropping and heated for more than 10 minutes. The solution was added with a small quantity of anhydrous ferrous sulphate, decomposing the permanganic acid. The solution of ammonium nitrate and ammonium molybdate was added to the mother liquor, from which the phosphor precipitates by shaking. The mother liquor was again cleaned by filteration and the filterate was diluted into 250_<cc>, of which 10_<cc> is extracted into the colorimetric tube. A little excess of the emulsion of zinc oxide was added thereto for neutralization, the excess portion being dissolved by dropping of sulphuric acid (1 : 5). Hydroquinone (5% solution) was added to the solution, which was left behind for several minutes and then added with a solution of sodium sulphite in the sulphurous acid water, making a total volume of 30_<cc>. The final solution was heated in the water bath, when the silicon revealed a distinct blue color in the solution. The blue solution was cooled by water, and transposed into one of the glass cells of the colorimeter, while the other cell was filled with the "comparative" solution, which had been obtained in the same treatment from the sample with the known silicon content. In controlling the liquid level of both cells by upward or downward movement of the glass lever, the silicon content was calculated by reading the scale when the two colors became equal.
社団法人日本鉄鋼協会の論文
1941-11-25

鐵鋼珪素の比色分析法の研究

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