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  • 1 Ecole Nationale Supérieure de Chimie de Mulhouse, Université de Haute-Alsace, 3, Rue Alfred Werner, F-68093 Mulhouse Cedex, France
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Abstract

Pure alkali metal preparation is a complex problem: in most available commercial samples, all of them are simultaneously present. Conventional separation techniques are not always effective enough to reach parts per million total impurity levels. However, near the melting point, superficial segregation occurs. A zone melting derived technique coupled with a specifically developed solvent extraction process allows the total impurity content of sodium to be lowered below a few parts per million. The described thermal process, although using chemical reactions, is purely physically steered: it purifies as well potassium containing sodium as sodium containing potassium. 4 alkali metals are considered: Li, Na; K, and Cs.

  • 1 Walter, S. Aleboyeh, A. 1996 Fresenius' J. Anal. Chem. 355 687687.

  • 2 Walter, S., Thesis, UHA No. 06811664, (19/12/87), Mulhouse, France, p. 120, 195–200.

  • 3 Brown, A. M. Ashby, M. F. S. 1980 Acta Metallurgica 28 10851085. .

  • 4 Landolt-Börnstein 1969 Zahlenwerte und Funktionen Transport Phänomene-1,2 Springer Verlag Berlin 55.

  • 5 Hansen, M. Anderko, K. 1958 Constitution of binary alloys Mac Graw Hill London 577577.

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