{"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\/es\/deep-filtration-of-molten-aluminum\/","title":{"rendered":"Filtraci\u00f3n profunda del aluminio fundido"},"content":{"rendered":"

Se han desarrollado tres tipos de filtros para la filtraci\u00f3n profunda del aluminio fundido: el filtro de medio r\u00edgido, el de lecho granular (filtro de lecho profundo) (DBF) y el filtro de espuma cer\u00e1mica (CFF). Estos dos \u00faltimos dispositivos son los m\u00e1s utilizados para la filtraci\u00f3n del aluminio l\u00edquido. En la actualidad, m\u00e1s de 50% del aluminio forjado de todo el mundo se filtra mediante CFF.<\/p>\n

El CFF se presenta en forma de bloques. Se fabrican b\u00e1sicamente mediante la tecnolog\u00eda de \u201creplicaci\u00f3n de burbujas\u201d. En este proceso, la espuma de poliuretano se recubre con una pasta cer\u00e1mica y, a continuaci\u00f3n, las piezas secadas se someten a un proceso de cocci\u00f3n. Durante la cocci\u00f3n, la espuma de poliuretano del recubrimiento cer\u00e1mico se evapora, dejando una espuma cer\u00e1mica porosa (al\u00famina ligada con fosfato). Los filtros de espuma cer\u00e1mica var\u00edan en tama\u00f1o entre 18 cm y 66 cm, y el grosor est\u00e1ndar es de 5 cm. La velocidad de filtraci\u00f3n suele situarse entre 0,6 y 1,6 cm\/s.<\/p>\n

El tiempo de permanencia del metal l\u00edquido en CFF<\/a> es mucho menor que la de filtro de lecho profundo<\/a> DBF. Los CFF suelen ser menos eficientes que los DBF y tienen una vida \u00fatil m\u00e1s corta. Por otro lado, los CFF son m\u00e1s baratos y m\u00e1s f\u00e1ciles de usar que los DBF.<\/p>\n

\"Filtro
Filtro de lecho profundo<\/figcaption><\/figure>\n

En el caso del aluminio l\u00edquido, la eliminaci\u00f3n de inclusiones reviste una importancia especial. Aunque se han realizado esfuerzos para reducir la concentraci\u00f3n de inclusiones, la elevada reactividad del aluminio l\u00edquido y la presencia de materiales refractarios provocar\u00e1n inevitablemente la formaci\u00f3n de nuevas inclusiones en el metal l\u00edquido, desde la fase de procesamiento de la masa fundida hasta la colada de los productos semiacabados.<\/p>\n

Las inclusiones se clasifican como end\u00f3genas o ex\u00f3genas seg\u00fan su origen. La reacci\u00f3n qu\u00edmica del metal l\u00edquido (por ejemplo, la formaci\u00f3n de \u00f3xidos superficiales) da lugar a la formaci\u00f3n de inclusiones end\u00f3genas in situ. Las inclusiones extra\u00f1as proceden del medio externo y penetran en el metal l\u00edquido. Dichas inclusiones pueden consistir en fragmentos de material refractario procedentes de hornos o dep\u00f3sitos.<\/p>\n

El dise\u00f1o de los filtros que se utilizan actualmente en los talleres de fundici\u00f3n de aluminio favorece el uso del modo de filtraci\u00f3n en profundidad. El filtro de espuma cer\u00e1mica<\/a> adopta los siguientes m\u00e9todos de filtraci\u00f3n: la filtraci\u00f3n por torta de aluminio fundido, en la que las part\u00edculas en suspensi\u00f3n de tama\u00f1o superior al di\u00e1metro de los poros del filtro se depositan en la entrada del filtro y forman una torta cuyo espesor va aumentando hasta constituir el medio filtrante propiamente dicho; filtraci\u00f3n profunda del aluminio fundido, en la que las part\u00edculas en suspensi\u00f3n tienen un tama\u00f1o inferior al de los poros del filtro, por lo que penetran en el filtro y se depositan en \u00e9l (lo que provoca que el filtro se obstruya gradualmente).<\/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\/es\/deep-filtration-of-molten-aluminum\/\" \/>\n<meta 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