{"id":9987,"date":"2021-08-20T06:07:19","date_gmt":"2021-08-20T06:07:19","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=9987"},"modified":"2021-08-20T06:07:19","modified_gmt":"2021-08-20T06:07:19","slug":"metal-refining-treatment","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/metal-refining-treatment\/","title":{"rendered":"Traitement d'affinage des m\u00e9taux"},"content":{"rendered":"<p>Le traitement d'affinage des m\u00e9taux permet d'\u00e9liminer ou de r\u00e9duire au minimum les inclusions de gaz et d'oxydes pr\u00e9sentes dans la masse fondue d'alliage d'aluminium r\u00e9g\u00e9n\u00e9r\u00e9, afin d'am\u00e9liorer le degr\u00e9 de purification de celle-ci. Les exigences en mati\u00e8re de puret\u00e9 des masses fondues d\u2019alliages d\u2019aluminium recycl\u00e9s varient en fonction des vari\u00e9t\u00e9s et des utilisations. On exige g\u00e9n\u00e9ralement que la teneur en hydrog\u00e8ne pour 100 g d\u2019aluminium soit inf\u00e9rieure \u00e0 0,2 ml, et pour certains alliages d\u2019aluminium sp\u00e9ciaux, cette teneur doit \u00eatre maintenue \u00e0 moins de 0,1 ml pour 100 g d\u2019aluminium. En production r\u00e9elle, la m\u00e9thode d\u2019analyse m\u00e9tallographique est utilis\u00e9e pour analyser qualitativement le degr\u00e9 de porosit\u00e9 dans la structure de l\u2019alliage d\u2019aluminium afin de mesurer la teneur en hydrog\u00e8ne. La d\u00e9tection des inclusions non m\u00e9talliques ne pouvant \u00eatre quantifi\u00e9e avec pr\u00e9cision, il est difficile de d\u00e9finir des exigences quantitatives ; celles-ci ne peuvent \u00eatre \u00e9valu\u00e9es que par une analyse m\u00e9tallographique de la structure du lingot. Enfin, il convient d\u2019\u00e9valuer de mani\u00e8re globale l\u2019efficacit\u00e9 du traitement d\u2019affinage de la coul\u00e9e et de d\u00e9terminer les param\u00e8tres de ce traitement.<\/p>\n<p>Le chlore \u00e9tant toxique, il est nocif pour la sant\u00e9 humaine et provoque une forte corrosion des \u00e9quipements environnants. C'est pourquoi le traitement actuel d'affinage des m\u00e9taux utilis\u00e9 pour la fonte d'alliages d'aluminium recycl\u00e9s recourt g\u00e9n\u00e9ralement \u00e0 un traitement de purification en continu \u00e0 l'aide d'azote (N\u2082) ou d'un m\u00e9lange d'azote (N\u2082) et de chlore (Cl\u2082).<\/p>\n<p>L'azote \u00e9tant chimiquement inactif, il ne r\u00e9agit pas chimiquement avec la masse fondue d'alliage d'aluminium r\u00e9g\u00e9n\u00e9r\u00e9e ni avec les autres gaz dissous \u00e0 la temp\u00e9rature d'affinage, et il n'est pas non plus soluble dans la masse fondue ; par cons\u00e9quent, l'injection d'azote dans la masse fondue peut entra\u00eener la formation d'un grand nombre de bulles.<\/p>\n<p>Dans ces bulles d'azote, la pression partielle d'hydrog\u00e8ne est nulle, tandis que celle-ci dans la masse fondue est bien sup\u00e9rieure \u00e0 z\u00e9ro. Il existe donc une importante diff\u00e9rence de pression partielle entre la masse fondue et les bulles d\u2019azote, et l\u2019hydrog\u00e8ne pr\u00e9sent dans la masse fondue continue de s\u2019\u00e9couler vers les bulles. Il se diffuse et p\u00e9n\u00e8tre dans la bulle jusqu\u2019\u00e0 ce que la pression partielle de l\u2019hydrog\u00e8ne dans la bulle atteigne celle de la masse fondue, et qu\u2019un \u00e9quilibre soit atteint.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-9929\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2021\/08\/Gas-Purification-Process.jpg\" alt=\"Proc\u00e9d\u00e9 de purification des gaz\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/08\/Gas-Purification-Process.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/08\/Gas-Purification-Process-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Lorsqu'un grand nombre de bulles d'azote remontent \u00e0 la surface de la masse fondue, l'hydrog\u00e8ne contenu dans ces bulles s'\u00e9chappe dans l'atmosph\u00e8re, ce qui entra\u00eene la formation continue de nouvelles bulles ; ainsi, l'hydrog\u00e8ne dissous dans la masse fondue peut \u00eatre \u00e9limin\u00e9 en continu. Au cours de leur remont\u00e9e, lorsque les bulles rencontrent des inclusions, celles-ci adh\u00e8rent \u00e0 leur surface sous l\u2019effet de la tension superficielle, et sont \u00e9limin\u00e9es \u00e0 mesure que les bulles remontent. Ainsi, les inclusions sont \u00e9galement \u00e9limin\u00e9es en m\u00eame temps que le gaz.<\/p>\n<p><a href=\"http:\/\/www.alalloycasting.com\/fr\/degassing-with-nitrogen\/\">D\u00e9gazage \u00e0 l'azote<\/a> Lors du traitement de la masse fondue d'alliage d'aluminium recycl\u00e9, la temp\u00e9rature d'affinage doit \u00eatre maintenue dans une plage comprise entre 690 et 710 \u2103. En effet, si la temp\u00e9rature est trop \u00e9lev\u00e9e, l'azote risque d'entrer en r\u00e9action chimique avec l'aluminium. La pression d'azote est maintenue dans une plage comprise entre 10 et 15 kPa.<\/p>","protected":false},"excerpt":{"rendered":"<p>Metal refining treatment can remove or minimize the gas and oxide inclusions in the regenerated aluminum alloy melt, so as to improve the degree of&hellip;<\/p>","protected":false},"author":1,"featured_media":9988,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-9987","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Metal Refining Treatment, Degassing With Nitrogen<\/title>\n<meta name=\"description\" content=\"Metal refining treatment can remove the gas and oxide inclusions in the aluminum alloy melt, so as to improve the melt purification degree.\" 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