Separation and Determination of Rare Earth Elements in Iron and Steel. I

概要

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Recently "Mischmetall" is often used to manufacture high-alloy steels. This technique, however, requires accurate chemical analyses of rare earth elements in iron and steel. So a method was examined which is superior in simplicity, rapidity and accuracy to those ever used in this field. In the present study, rare earth elements were isolated from the many coexisting metals by one of the following three methods : (1) The principal constituent, iron, was extracted by methyl isobutyl ketone, then the remaining iron and chromium were separated by electrolysis and binally the rare earth elements were separated by precipitation as fluorides ; (2) For the sample containing tungsten, the precipitated tungsten trioxide was redissolved in ammonia water and by adding hydrogen fluoride the rare earth elements were regained as fluorides ; (3) The sample was dissolved in perchloric acid and hydrofluoric acid, and the rare earth elements were separated directly as fluorides.
東北大学の論文