{"id":8439,"date":"2021-04-20T03:08:12","date_gmt":"2021-04-20T03:08:12","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=8439"},"modified":"2021-04-20T03:08:12","modified_gmt":"2021-04-20T03:08:12","slug":"deep-filtration-of-molten-aluminum","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/deep-filtration-of-molten-aluminum\/","title":{"rendered":"Filtration en profondeur de l'aluminium fondu"},"content":{"rendered":"

Trois types de filtres destin\u00e9s \u00e0 la filtration en profondeur de l'aluminium fondu ont \u00e9t\u00e9 mis au point : le filtre \u00e0 milieu rigide, le filtre \u00e0 lit granulaire (filtre \u00e0 lit profond) (DBF) et le filtre en mousse c\u00e9ramique (CFF). Ces deux derniers dispositifs sont les plus couramment utilis\u00e9s pour la filtration de l'aluminium liquide. Aujourd\u2019hui, plus de 50% d\u2019aluminium corroy\u00e9 dans le monde sont trait\u00e9s \u00e0 l\u2019aide de filtres CFF.<\/p>\n

Les CFF se pr\u00e9sentent sous forme de blocs. Ils sont essentiellement fabriqu\u00e9s gr\u00e2ce \u00e0 la technologie de la \u201c r\u00e9plication par bulles \u201d. Dans ce proc\u00e9d\u00e9, la mousse de polyur\u00e9thane est enrob\u00e9e d\u2019une suspension c\u00e9ramique, puis les pi\u00e8ces s\u00e9ch\u00e9es sont cuites. Au cours de la cuisson, la mousse de polyur\u00e9thane contenue dans l\u2019enrobage c\u00e9ramique s\u2019\u00e9vapore, laissant place \u00e0 une mousse c\u00e9ramique poreuse (alumine li\u00e9e au phosphate). Les filtres en mousse c\u00e9ramique ont des dimensions comprises entre 18 cm et 66 cm, et leur \u00e9paisseur standard est de 5 cm. La vitesse de filtration est g\u00e9n\u00e9ralement comprise entre 0,6 et 1,6 cm\/s.<\/p>\n

Le temps de s\u00e9jour du m\u00e9tal liquide dans CFF<\/a> est bien inf\u00e9rieur \u00e0 celui de filtre \u00e0 lit profond<\/a> DBF. Les CFF sont g\u00e9n\u00e9ralement moins performants que les DBF et ont une dur\u00e9e de vie plus courte. En revanche, les CFF sont moins chers et plus faciles \u00e0 utiliser que les DBF.<\/p>\n

\"Filtre
Filtre \u00e0 lit profond<\/figcaption><\/figure>\n

Dans le cas de l'aluminium liquide, l'\u00e9limination des inclusions rev\u00eat une importance particuli\u00e8re. Bien que des efforts aient \u00e9t\u00e9 d\u00e9ploy\u00e9s pour r\u00e9duire la concentration en inclusions, la forte r\u00e9activit\u00e9 de l'aluminium liquide et la pr\u00e9sence de mat\u00e9riaux r\u00e9fractaires entra\u00eenent in\u00e9vitablement la formation de nouvelles inclusions dans le m\u00e9tal liquide, depuis l'\u00e9tape de traitement de la masse fondue jusqu'au moulage des produits semi-finis.<\/p>\n

Les inclusions sont class\u00e9es en inclusions endog\u00e8nes ou exog\u00e8nes selon leur origine. La r\u00e9action chimique du m\u00e9tal liquide (par exemple, la formation d\u2019oxydes en surface) entra\u00eene la formation d\u2019inclusions endog\u00e8nes in situ. Les inclusions \u00e9trang\u00e8res proviennent du milieu ext\u00e9rieur et p\u00e9n\u00e8trent dans le m\u00e9tal liquide. Ces inclusions peuvent \u00eatre constitu\u00e9es de fragments de mat\u00e9riaux r\u00e9fractaires provenant de fours ou de cuves.<\/p>\n

La conception des filtres utilis\u00e9s dans les ateliers de moulage d'aluminium actuels privil\u00e9gie le mode de filtration en profondeur. Le filtre en mousse c\u00e9ramique<\/a> utilise les modes de filtration suivants : la filtration par g\u00e2teau de l'aluminium fondu, dans laquelle les particules en suspension dont la taille est sup\u00e9rieure au diam\u00e8tre des mailles du filtre se d\u00e9posent \u00e0 l'entr\u00e9e du filtre et forment un g\u00e2teau dont l'\u00e9paisseur augmente progressivement pour constituer le milieu filtrant proprement dit ; la filtration en profondeur de l'aluminium fondu, dans laquelle les particules en suspension, dont la taille est inf\u00e9rieure \u00e0 celle des mailles du filtre, p\u00e9n\u00e8trent dans celui-ci et s'y d\u00e9posent (provoquant ainsi son colmatage progressif).<\/p>","protected":false},"excerpt":{"rendered":"

Three types of filters for deep filtration of molten aluminum have been developed: rigid medium filter, granular bed (deep bed filter) (DBF) and ceramic foam…<\/p>","protected":false},"author":1,"featured_media":8440,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-8439","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nDeep Filtration of Molten Aluminum with Ceramic Foam Filters<\/title>\n<meta name=\"description\" content=\"The filters for deep filtration of molten aluminum have been developed: rigid medium filter, deep bed filter and ceramic foam filter (CFF).\" \/>\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\/deep-filtration-of-molten-aluminum\/\" \/>\n<meta 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