{"id":8507,"date":"2021-04-23T05:42:07","date_gmt":"2021-04-23T05:42:07","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=8507"},"modified":"2021-04-23T05:42:07","modified_gmt":"2021-04-23T05:42:07","slug":"aluminum-degassing-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminum-degassing-refining\/","title":{"rendered":"D\u00e9gazage et affinage de l'aluminium"},"content":{"rendered":"

Dans le processus d'affinage par d\u00e9gazage des alliages d'aluminium et des m\u00e9taux non ferreux, il arrive souvent que des inclusions non m\u00e9talliques, telles que des oxydes, se forment et que de l'hydrog\u00e8ne se m\u00e9lange au m\u00e9tal en fusion. Par cons\u00e9quent, ce n\u2019est qu\u2019en s\u00e9parant ou en \u00e9liminant ces inclusions non m\u00e9talliques du m\u00e9tal en fusion avant le traitement qu\u2019il est possible d\u2019obtenir un produit fini de haute qualit\u00e9. De plus, l\u2019injection dans le moule d\u2019un m\u00e9tal en fusion contenant un gaz dissous sous forme solide, compos\u00e9 principalement d\u2019hydrog\u00e8ne, peut entra\u00eener l\u2019apparition de petites cavit\u00e9s appel\u00e9es \u201c piq\u00fbres \u201d apr\u00e8s solidification, ce qui se traduit par une diminution de la densit\u00e9 du produit fini. Par ailleurs, la pr\u00e9sence d\u2019inclusions li\u00e9es au gaz peut causer divers d\u00e9fauts dans le produit apr\u00e8s traitement.<\/p>\n

Compte tenu de ce qui pr\u00e9c\u00e8de, avant le coulage des m\u00e9taux non ferreux en alliage d'aluminium, le m\u00e9tal en fusion est d\u00e9gaz\u00e9 afin d'am\u00e9liorer la qualit\u00e9 de celui-ci. Au cours de cette op\u00e9ration de d\u00e9gazage et d\u2019affinage, un grand nombre de petites bulles de gaz inerte, tel que l\u2019argon ou l\u2019azote, sont inject\u00e9es dans le m\u00e9tal en fusion, de sorte que le gaz dissous sous forme solide et les inclusions non m\u00e9talliques soient pi\u00e9g\u00e9s ou captur\u00e9s par les bulles de gaz inerte et remontent \u00e0 la surface pour \u00eatre \u00e9limin\u00e9s.<\/p>\n

\"Unit\u00e9s<\/p>\n

Le unit\u00e9 de d\u00e9gazage<\/a> utilis\u00e9 pour la coul\u00e9e continue d\u2019aluminium est plac\u00e9 entre le four de maintien et la machine de coul\u00e9e, le long de la ligne de traitement du m\u00e9tal en fusion. Le dispositif de d\u00e9gazage re\u00e7oit en continu le m\u00e9tal en fusion par l\u2019entr\u00e9e. L\u2019ouverture sup\u00e9rieure du r\u00e9cipient de d\u00e9gazage est recouverte d\u2019un couvercle et, du c\u00f4t\u00e9 aval, la cloison s\u2019\u00e9tend vers le bas dans une direction transversale au flux de fluide. Elle sert \u00e0 emp\u00eacher les m\u00e9taux, y compris les oxydes et autres particules en suspension, de s\u2019\u00e9couler vers le processus de traitement suivant.<\/p>\n

Le temps de s\u00e9jour du m\u00e9tal en fusion dans la chambre de traitement en amont de la cloison peut prolonger la dur\u00e9e de l'op\u00e9ration de d\u00e9gazage. Le dispositif rotatif de diffusion de gaz est ins\u00e9r\u00e9 \u00e0 travers l'orifice du couvercle et se trouve dans le m\u00e9tal en fusion \u00e0 l'int\u00e9rieur de la cuve de d\u00e9gazage. La partie inf\u00e9rieure du dispositif de diffusion de gaz se trouve dans le m\u00e9tal en fusion et, simultan\u00e9ment, dans la partie inf\u00e9rieure. Gr\u00e2ce au mouvement de rotation, le gaz inerte est \u00e9ject\u00e9 par la partie inf\u00e9rieure du dispositif de diffusion de gaz, tandis que le gaz inerte sous forme de fines bulles se diffuse simultan\u00e9ment dans le m\u00e9tal en fusion.<\/p>\n

Outre le processus de d\u00e9gazage et d'affinage de l'aluminium d\u00e9crit ci-dessus, un br\u00fbleur destin\u00e9 \u00e0 chauffer le m\u00e9tal pr\u00e9sent dans la cuve est n\u00e9cessaire pour r\u00e9chauffer le m\u00e9tal restant dans celle-ci. Sinon, le m\u00e9tal restant dans le r\u00e9cipient commence \u00e0 se solidifier, ce qui rend difficile sa fusion homog\u00e8ne avec le m\u00e9tal nouvellement introduit. De plus, lorsque des travaux de maintenance sont n\u00e9cessaires dans la cuve de d\u00e9gazage, le fonctionnement du br\u00fbleur est essentiel pour \u00e9vacuer le m\u00e9tal en fusion restant dans la cuve.<\/p>","protected":false},"excerpt":{"rendered":"

In the degassing refining process of aluminum alloy and non-ferrous metals, it often happens that non-metallic inclusions such as oxides are generated and hydrogen is…<\/p>","protected":false},"author":1,"featured_media":8509,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-8507","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nAluminum Degassing Refining with Degassing Unit<\/title>\n<meta name=\"description\" content=\"Before the casting operation of aluminum alloy metals, the degassing refining process to improve the quality of the molten metal.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/fr\/aluminum-degassing-refining\/\" \/>\n<meta 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