砂鐵鑛の状態に關する研究

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The magnetic iron sands abundantly distributed in Japan are considered to be derived from the differentiations of igneous magma. The investigations on the micro-structure of the sand have been reported at several times by one of the authors since 1922, and in his opinion, they should belong mineralogically to the system of magnetite and ilmenite, and are chemically composed of ferrous, ferric and titanic oxides. In this paper authors quoted the leading conclutions previously proposed on this system (about 130 literatures are refrred), and a brief discussion on the methods of melting and measurement of temperatures in given. Chemical compounds or minerals known to the present time in this system are enumerated by 10, as shown in the following : - (1) Fe_2O_3 (2) Fe_3O_4 (3) FeTiO_3 (4) Fe_4Ti_3O_<12> (5) Fe_2Ti_3O_9 (6) TiO_2 (7) Fe_2TiO_5 (8) FeTi_2O_5 (9) Fe_2TiO_4 (10) FeO The results of the mineralogical analyses of 77 specimens of the component minerals such as ilmente, magnetite, hematite, arizonite, rutile, pseudo-brookite e.c. are illustrated diagramatically by the triangular coordinates ; the variable compositions in their occurrences being clearly explained. Magnetite, ilmenite, hematite and their coexisting grains are the essential components of the iron sands ; their summarized chemical compositions from about 100 localities vary from O to 20% of titanic oxide, 20 to 45% of ferrous oxide and 40 to 70% of ferric oxide. The authors emphasise the facts that the solid solution certainly dominates the entire ranges of magnetite-ilmenite, magnetite-hematite and hematite-ilmenite systems, and the regular intergrowths between them are derived from so called "Entmischungs-umwandlung" at the lower temperatures.
社団法人日本鉄鋼協会の論文
1930-02-25

砂鐵鑛の状態に關する研究

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