{"id":6930,"date":"2020-12-10T03:19:24","date_gmt":"2020-12-10T03:19:24","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6930"},"modified":"2020-12-10T03:19:24","modified_gmt":"2020-12-10T03:19:24","slug":"filtration-of-molten-metal","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/filtration-of-molten-metal\/","title":{"rendered":"Filtraci\u00f3n de metal fundido"},"content":{"rendered":"<p>Naturalmente, existe una gran necesidad de mejorar la filtraci\u00f3n y la desgasificaci\u00f3n del metal fundido para eliminar o minimizar dichas impurezas en el producto fundido final, especialmente en el caso del aluminio fundido, sobre todo cuando el metal resultante se utiliza, por ejemplo, para la fabricaci\u00f3n de productos de aluminio. productos decorativos (como las bandas decorativas) o productos con especificaciones clave (como piezas forjadas y extruidas para aeronaves, y materias primas para l\u00e1minas ligeras). Las impurezas mencionadas anteriormente provocan p\u00e9rdidas de rendimiento en el producto fundido final, como la resistencia a la tracci\u00f3n y la resistencia a la corrosi\u00f3n.<\/p>\n<p>El metal fundido, especialmente el aluminio fundido en la pr\u00e1ctica, suele contener impurezas gaseosas y s\u00f3lidas arrastradas y disueltas que resultan perjudiciales para el producto de fundici\u00f3n final. Estas impurezas pueden afectar a la solidificaci\u00f3n del metal de fundici\u00f3n final tras la fusi\u00f3n, lo que puede dificultar el procesamiento o la ductilidad del producto final, o bien reducir la capacidad de anodizaci\u00f3n. Las impurezas pueden proceder de m\u00faltiples fuentes. Por ejemplo, pueden incluir impurezas met\u00e1licas, como metales alcalinos y metales alcalinot\u00e9rreos, as\u00ed como hidr\u00f3geno disuelto y pel\u00edculas de \u00f3xido superficiales que quedan atrapadas y arrastradas en el metal fundido. Adem\u00e1s, las inclusiones pueden proceder de impurezas insolubles, como carburos, boruros, etc., o de los materiales refractarios corro\u00eddos del horno y del dep\u00f3sito.<\/p>\n<p>Los procesos rigurosos de tratamiento de metales (como el fundente gaseoso o la filtraci\u00f3n en estado fundido) han minimizado la incidencia de dichos defectos. Sin embargo, no han logrado reducirla hasta el nivel satisfactorio que exigen las aplicaciones cr\u00edticas. Los procesos convencionales de fundente gaseoso conductor, como el fundente de solera general, consisten en introducir gas fundente en un horno de mantenimiento que contiene una determinada cantidad de metal fundido. Este procedimiento requiere que el horno se apague mientras se hace circular el gas fundente, de modo que el metal que se est\u00e1 procesando se mantenga constante y pueda ser tratado. Este m\u00e9todo presenta numerosas desventajas; entre ellas, la reducci\u00f3n de la eficiencia debido al prolongado tiempo de inactividad del horno durante el proceso de fundente, y una eficiencia insuficiente debido a la baja relaci\u00f3n entre la superficie y el volumen del fundente gaseoso y el metal fundido. Otros factores son las restricciones en la ubicaci\u00f3n del horno, lo que permite que las impurezas vuelvan a entrar en la masa fundida antes de la colada, y las elevadas emisiones debidas a la gran cantidad de fundente necesaria y a su ubicaci\u00f3n de circulaci\u00f3n.<\/p>\n<p>Como alternativa a los flujos por lotes descritos anteriormente, algunos <a href=\"http:\/\/www.alalloycasting.com\/es\/fluxes\/\">flujos<\/a> se utilizan en serie. Es decir, las operaciones y los equipos relacionados se encuentran fuera del horno de fusi\u00f3n o de mantenimiento, y suelen situarse entre el horno de fusi\u00f3n y el horno de mantenimiento, o entre el horno de mantenimiento y la estaci\u00f3n de colada. Esto ayuda a paliar la ineficiencia causada por la parada del horno, pero no resulta tan eficaz a la hora de mejorar la eficiencia operativa, ya que a menudo se requiere una gran cantidad de gas de flujo por unidad de metal fundido, lo cual es costoso y perjudicial para la pureza del aire.<\/p>\n<p>Tradicionalmente, se recurre a la filtraci\u00f3n en estado fundido para reducir la incidencia de los defectos mencionados anteriormente. La forma m\u00e1s habitual de filtraci\u00f3n en estado fundido consiste en colocar el metal fundido en un dep\u00f3sito de transferencia y colada o en un lecho de tela de vidrio sobre un lingote de metal solidificado. Se ha comprobado que estos filtros solo son parcialmente eficaces, ya que \u00fanicamente eliminan las inclusiones de mayor tama\u00f1o. Otro filtro de uso habitual es, por ejemplo, un filtro de lecho fabricado con al\u00famina tubular. Estos filtros presentan numerosas desventajas, siendo quiz\u00e1s la m\u00e1s grave la enorme dificultad que entra\u00f1a controlar y mantener el tama\u00f1o de poro necesario para una filtraci\u00f3n eficaz. Otra dificultad de estos filtros es que tienden a producir metal de mala calidad inicial al comienzo de cada ciclo de colada continua.<\/p>\n<p><a href=\"http:\/\/www.alalloycasting.com\/es\/porous-foam-ceramic-materials\/\">Materiales cer\u00e1micos porosos de espuma<\/a>\u00a0son especialmente adecuados para filtrar metal fundido por numerosas razones, entre las que se incluyen su excelente capacidad de filtraci\u00f3n, su bajo coste, su facilidad de uso y la posibilidad de utilizarlos como productos desechables. El hecho de que estos filtros de espuma cer\u00e1mica sean pr\u00e1cticos y econ\u00f3micos de preparar, y puedan utilizarse una sola vez, requiere el desarrollo de un dispositivo que permita montar y retirar de forma f\u00e1cil y c\u00f3moda los filtros porosos para metal fundido de la unidad de filtrado. Disponemos de un dispositivo de filtrado adecuado para instalar la placa filtrante.<\/p>","protected":false},"excerpt":{"rendered":"<p>Naturally, there is a great need to improve the filtration and degassing of molten metal to remove or minimize such impurities in the final cast&hellip;<\/p>","protected":false},"author":1,"featured_media":6931,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6930","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>Filtration of Molten Metal with Porous Ceramic Foam Filters<\/title>\n<meta name=\"description\" content=\"Ceramic foam filters\u00a0are particularly suitable for filtration of molten metal for many reasons, including excellent 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