{"id":11540,"date":"2021-11-29T06:38:24","date_gmt":"2021-11-29T06:38:24","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=11540"},"modified":"2021-11-29T06:38:24","modified_gmt":"2021-11-29T06:38:24","slug":"flux-gas","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/flux-gas\/","title":{"rendered":"Gas de fundici\u00f3n"},"content":{"rendered":"<p>Para eliminar los elementos alcalinos (es decir, Na, Ca, K y Li), la pr\u00e1ctica habitual en el procesamiento del aluminio fundido es el uso de un gas fundente activo que contiene cloro. En condiciones de equilibrio, se forman los cloruros de cada uno de estos elementos como productos de la reacci\u00f3n. A excepci\u00f3n del LiCl, todas estas sales halogenadas, en estado puro, son s\u00f3lidas a las temperaturas normales de procesamiento, por lo que se separan f\u00e1cilmente en la superficie del fundido y se eliminan mediante desnatado.<\/p>\n<p>Los elementos alcalinos suelen estar presentes en concentraciones en la masa fundida inferiores a 500 ppm. Seg\u00fan la ley de acci\u00f3n de masas (la velocidad de reacci\u00f3n es proporcional a la concentraci\u00f3n del reactivo), se generan sales metaestables fuera de equilibrio, como el AlCl\u2083 y el MgCl\u2082 (si hay Mg presente). Estos haluros son indeseables porque contribuyen en gran medida a la generaci\u00f3n de emisiones atmosf\u00e9ricas. Adem\u00e1s, el MgCl\u2082 se funde a 1306 \u00b0F y suele fundirse a la temperatura normal del proceso de fusi\u00f3n. La sal fundida es muy indeseable porque resulta dif\u00edcil de extraer hacia la superficie para su separaci\u00f3n por flotaci\u00f3n. Por lo tanto, existe una gran necesidad de hacer reaccionar los elementos de metales alcalinos para producir sales con un punto de fusi\u00f3n m\u00e1s alto, que se separen de forma m\u00e1s eficaz hacia la superficie en estado s\u00f3lido mediante flotaci\u00f3n.<\/p>\n<p>En el m\u00e9todo actual de dispersi\u00f3n del gas fundente, por ejemplo, en la masa de aluminio fundido, el gas fundente se introduce en el cuerpo principal hacia abajo en direcci\u00f3n axial y se dispersa mediante un impulsor giratorio montado en el eje. Sin embargo, este m\u00e9todo no est\u00e1 exento de limitaciones. El impulsor giratorio genera un v\u00f3rtice alrededor del eje, lo que implica que la mayor parte del metal fundido gira alrededor del eje del impulsor a una velocidad cercana a la del propio impulsor. El fundente a\u00f1adido al metal fundido tiende a circular junto con este, con muy poca dispersi\u00f3n. Adem\u00e1s, el v\u00f3rtice tiene el efecto de aumentar la superficie del metal fundido expuesta al aire. La mayor exposici\u00f3n del metal fundido al aire provoca una mayor formaci\u00f3n de escoria, el consiguiente arrastre de la misma y sus efectos colaterales adversos.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-11542\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2021\/11\/Flux-Gas.jpg\" alt=\"\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/11\/Flux-Gas.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/11\/Flux-Gas-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Cuando el material fundente es un gas, las corrientes par\u00e1sitas pueden causar problemas de otra forma. El gas fundente se desplaza hacia el centro del v\u00f3rtice y, como consecuencia, el resto de la masa fundida no es tratada suficientemente por el gas fundente. Por lo tanto, la eficacia del proceso se ve reducida, ya que parte del metal fundido no es tratado por el material fundente. Adem\u00e1s, el gas fundente arrastrado por el flujo de metal fundido tiende a aglutinarse, lo que da lugar a burbujas de gas fundente m\u00e1s grandes en el metal fundido. Las burbujas m\u00e1s grandes reducen la eficiencia del proceso de fundici\u00f3n, ya que se trata una menor cantidad de metal fundido.<\/p>\n<p>Por lo tanto, existe una gran necesidad de un proceso de fundente m\u00e1s eficaz, que impida que la escoria de la superficie vuelva a incorporarse al ba\u00f1o de fusi\u00f3n \u2014por ejemplo, mediante la formaci\u00f3n de corrientes par\u00e1sitas\u2014, con el fin de mantener el fundente finamente disperso en todo el ba\u00f1o de fusi\u00f3n y reforzar el contacto con el metal fundido. El material fundido mejora la fusi\u00f3n del metal. Adem\u00e1s, existe una gran necesidad de un <a href=\"http:\/\/www.alalloycasting.com\/es\/ceramic-foam-filtration\/\">filtraci\u00f3n con espuma cer\u00e1mica<\/a> m\u00e9todo para la filtraci\u00f3n del aluminio fundido.<\/p>","protected":false},"excerpt":{"rendered":"<p>In order to remove alkali elements (ie Na, Ca, K, Li), the use of chlorine-containing active flux gas is the accepted practice for processing molten&hellip;<\/p>","protected":false},"author":1,"featured_media":11541,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[12993,12994],"class_list":["post-11540","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-flux-gas-for-processing-molten-aluminum","tag-remove-alkali-elements"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Flux 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