全鉄,酸化チタン,および酸化第一鉄の定量

砂鉄およびチタン鉄鉱の分析法の研究-I

抄録

This work was undertaken to find rapid chemical methods for the analysis of sand iron and ilmenite.
The methods are shown in outline Fig. 1. As the chief source of error in ore analysis was found in the separations, and this takes most of the time, separations were avoided as far as possible. Most of the measurements were made photmetrically, and procedures were planned to involve a minimum of manipulation.
Each constituent was determined independently, for example, in a first sample decomposed by fusion with Na₂O₂ in a nickel crucible and solution in H₂SO₄, after reduced with Znamalgam. Total Fe and TiO₂ were determined by titration with KMnO₄ using a NaWO₄ indicator. SiO₂, Al₂O₃, MnO, V₂O₅, Cr₂O₃, and P₂O₅ were determined photometrically. CaO and CaO plus MgO were determined by titration with EDTA. In a second sample decomposed by H₂PO₄ and NH₄VO₃, FeO was determined by titration with KMnO₄. Accuracy was compared favorably with the former methods.