Abrégé

The invention relates to a method for making bars made of a zirconium, titanium or hafnium alloy, that comprises preparing an ingot of said alloy, hot-shaping the same e.g. by forging and/or rolling in the form of a bar, cold-shaping the bar, and carrying out a thermal processing on the cold-rolled bar, characterised in that said cold-shaping comprises at least one pass of the bar in a Pilger mill. The invention also relates to components made of a zirconium, titanium or hafnium alloy and machined from said bars.

Classes IPC  ?

• B21B 1/42 - Méthodes de laminage ou laminoirs pour la fabrication des produits semi-finis de section pleine ou de profilésSéquence des opérations dans les trains de laminoirsInstallation d'une usine de laminage, p. ex. groupement de cagesSuccession des passes ou des alternances de passes pour laminage progressif intermittent ou par train planétaire
• B21B 21/00 - Laminage des tubes par mouvement à pas de pèlerin
• C22F 1/18 - Métaux réfractaires ou à point de fusion élevé ou leurs alliages
• C22F 1/16 - Modification de la structure physique des métaux ou alliages non ferreux par traitement thermique ou par travail à chaud ou à froid des autres métaux ou de leurs alliages
• C22C 14/00 - Alliages à base de titane
• C22C 16/00 - Alliages à base de zirconium
• C22C 28/00 - Alliages à base d'un métal non mentionné dans les groupes

Abrégé

A process for the separation and purification of hafnium and zirconium.

Classes IPC  ?

• B01D 11/00 - Extraction par solvants

Abrégé

Method of stabilizing radium present in radium-containing effluent, in which the effluent and a metal chloride are mixed, then the previously obtained mixture is reacted with a sulfate ion to obtain effluent containing stabilized radium. The chloride can be a barium, strontium or lead chloride. The sulfate ion can be supplied by the addition of sulfuric acid, sulfuric anhydride, soluble sulfate or soluble sulfate salt. The method applies in particular to the treatment of solid radium-containing effluents or effluents containing substances in suspension coming from chemistry or metallurgy of zirconium or treatment of uranium-containing minerals.

Classes IPC  ?

• G21F 9/10 - Traitements par floculation

Abrégé

The invention relates to a method for converting ZrF4 into ZrO2 by thermally converting solid ZrF4 and water heated in a reactor, to form ZrO2. The initial weight ratio ZrF4 on water is especially between 1/5 and 1/500, preferably between 1/10 and 1/200, more specifically between 1/15 and 1/100, and said ratio is preferably maintained essentially throughout the conversion. The thermal conversion is carried out at a temperature which is higher than, or equal to, 300 °C, especially between 300 and 800 °C, preferably between 300 and 600 °C, more specifically between 350 and 450 °C. The invention especially relates to the recycling of the zirconium alloy stripping baths.

Classes IPC  ?

• C01G 25/02 - Oxydes
• C23G 1/36 - Régénération des liqueurs de décapage usées