Aluminium Pechiney

Commissariat a L'energie Atomique Et Aux Energies Alternatives

Comurhex Societe Pour La Conversion De L'ranium En Metal Et Hexafluorure

Gerard Picard

Yves Bertaud

Michel Leroy

Francoise Seon

Francis Abraham

Thierry Plet

Patrick Germanaz

Jean-Francois Vigier

Catherine Renard

Evelyne Prat

Cyrine Slim

Sylvie Lamirault

Annabelle Laplace

Sylvie Delpech

Bernard Tremillon

The invention relates to a process for manufacturing an oxychloride or oxide of actinide(s) and/or of lanthanide(s) from a chloride of actinide(s) and/or of lanthanide(s) present in a medium comprising at least one molten salt of chloride type comprising a step of bringing said chloride of actinide(s) and/or lanthanide(s) present in said medium comprising at least one molten salt of chloride type into contact with a wet inert gas.

Process for preparing an oxyhalogenide and/or oxide of actinide(s) and/or of lanthanide(s) from a medium comprising at least one molten salt

The invention concerns a process and apparatus for electrochemical measurement of the concentration of oxide ions dissolved in a bath based on molten halides. The process is based on impedance measurement at a low current and a low overvoltage, between an indicator electrode, a reference electrode and a counter electrodes. The real value Z.sub.r of the impedance is determined for two frequencies, a low frequency Zr(B) (such as 15-25 Hz) and a high frequency Zr(H) (such as 10-100 kHz); the inverse of the concentration of oxide ions is a linear function of the difference between Zr(B) and Zr(H). This method has a high level of accuracy in the low ranges of concentration of oxide ions.

Process for electrochemical measurement of the concentration of oxide

Process for the passivating anodization of copper in a medium of molten

Selective chlorination method for mixtures of metallic oxides of natural

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Fontenay Sous Bois, France

Gerard Picard