{"id":10698,"date":"2021-10-21T06:24:26","date_gmt":"2021-10-21T06:24:26","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10698"},"modified":"2021-10-21T06:24:26","modified_gmt":"2021-10-21T06:24:26","slug":"impurity-removal-in-metal-melt","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/impurity-removal-in-metal-melt\/","title":{"rendered":"\u00c9limination des impuret\u00e9s dans le m\u00e9tal en fusion"},"content":{"rendered":"

Lorsque la masse fondue d'alliage d'aluminium secondaire refroidit, les impuret\u00e9s non m\u00e9talliques solides se r\u00e9partissent aux limites des grains, ce qui r\u00e9duit les propri\u00e9t\u00e9s m\u00e9caniques de l'alliage. Afin de garantir les performances de l'alliage r\u00e9g\u00e9n\u00e9r\u00e9, l'\u00e9limination des impuret\u00e9s de la masse fondue est essentielle pour la coul\u00e9e suivante.<\/p>\n

M\u00e9thode d'\u00e9limination des impuret\u00e9s dans le m\u00e9tal en fusion<\/h2>\n

(1) Le proc\u00e9d\u00e9 de filtration consiste \u00e0 faire passer le bain d'alliage d'aluminium \u00e0 l'\u00e9tat fondu \u00e0 travers un mat\u00e9riau filtrant afin d'\u00e9liminer les impuret\u00e9s. Lorsque le bain d'alliage \u00e0 l'\u00e9tat fondu traverse le filtre, les particules solides sont retenues par celui-ci.<\/p>\n

Filtres en mousse c\u00e9ramique<\/a> (CFF) sont largement utilis\u00e9s pour filtrer les impuret\u00e9s de l'aluminium en fusion dans les ateliers de coul\u00e9e. Face \u00e0 la demande croissante de produits en aluminium de haute qualit\u00e9, la filtration du m\u00e9tal en fusion \u00e0 l'aide de filtres en mousse c\u00e9ramique s'est r\u00e9v\u00e9l\u00e9e \u00eatre une m\u00e9thode optimale pour am\u00e9liorer la qualit\u00e9 du m\u00e9tal.<\/p>\n

\"Filtres<\/p>\n

(2) L'affinage au gaz s'effectue par injection d'un gaz inerte dans le laitier. Lorsque le gaz inject\u00e9 se diffuse dans la masse fondue, l'hydrog\u00e8ne dissous dans le liquide d'alliage se diffuse dans les petites bulles du gaz inject\u00e9. Ce processus permet \u00e9galement d'\u00e9liminer les oxydes et autres impuret\u00e9s insolubles. Tout comme lors de la flottation, les inclusions solides sont \u00e9galement adsorb\u00e9es par les petites bulles, puis remontent \u00e0 la surface du bain fondu.<\/p>\n

Le dispositif de d\u00e9gazage<\/a> Il s'agit d'un syst\u00e8me de traitement des m\u00e9taux en fusion respectueux de l'environnement, qui assure le d\u00e9gazage et l'\u00e9limination des scories des alliages d'aluminium. Le dispositif de d\u00e9gazage, qui repose sur le principe de la turbine et utilise un rotor, g\u00e9n\u00e8re de petites bulles de gaz inerte et les m\u00e9lange au m\u00e9tal en fusion. Ces minuscules bulles sont r\u00e9parties uniform\u00e9ment dans le m\u00e9tal en fusion, ce qui maximise la surface de contact entre le gaz et le m\u00e9tal en fusion. Le dispositif de d\u00e9gazage offre des performances sup\u00e9rieures en mati\u00e8re de d\u00e9gazage et d'\u00e9limination des scories, et permet de r\u00e9duire la dur\u00e9e du traitement.<\/p>\n

(3) Le raffinage du sel fait appel \u00e0 des fondants pour \u00e9liminer les gaz et les inclusions non m\u00e9talliques pr\u00e9sents dans le m\u00e9tal en fusion. Introduits dans la masse d'aluminium en fusion sous forme de fondants, ils g\u00e9n\u00e8rent des halog\u00e9nures d'aluminium gazeux qui s'\u00e9chappent ensuite.<\/p>\n

Flux granulaire<\/a> Il s'agit d'une gamme de flux respectueux de l'environnement utilis\u00e9s pour le traitement \u00e0 l'\u00e9tat fondu de l'aluminium et des alliages d'aluminium. Les flux en poudre pr\u00e9sentent certains inconv\u00e9nients, tels que la formation de poussi\u00e8re lors de l'application et l'\u00e9mission de fum\u00e9es toxiques. Cela entra\u00eene des risques pour la sant\u00e9 des travailleurs et des probl\u00e8mes environnementaux. Les flux en poudre posent \u00e9galement un probl\u00e8me d'efficacit\u00e9 variable en raison de la morphologie de la poudre. Pour pallier ces inconv\u00e9nients, des flux granul\u00e9s sans poussi\u00e8re ont \u00e9t\u00e9 mis au point.<\/p>","protected":false},"excerpt":{"rendered":"

When the secondary aluminum alloy melt is cooled, the solid non-metallic impurity is distributed on the grain boundary, which will reduce the mechanical properties of…<\/p>","protected":false},"author":1,"featured_media":10699,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10698","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nImpurity Removal in Metal Melt, Filtration and Degassing Refining<\/title>\n<meta name=\"description\" content=\"In order to provide the performance of the regenerated alloy, impurity removal in the metal melt is important for the next casting.\" \/>\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\/impurity-removal-in-metal-melt\/\" 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