{"id":9987,"date":"2021-08-20T06:07:19","date_gmt":"2021-08-20T06:07:19","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=9987"},"modified":"2021-08-20T06:07:19","modified_gmt":"2021-08-20T06:07:19","slug":"metal-refining-treatment","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/metal-refining-treatment\/","title":{"rendered":"Tratamiento de refinado de metales"},"content":{"rendered":"<p>El tratamiento de refinado de metales permite eliminar o reducir al m\u00ednimo las inclusiones de gas y \u00f3xido en la masa fundida de aleaci\u00f3n de aluminio regenerada, con el fin de mejorar el grado de purificaci\u00f3n de la misma. Los requisitos de pureza de los fundidos de aleaciones de aluminio recicladas var\u00edan en funci\u00f3n de las distintas variedades y usos. Por lo general, se exige que el contenido de hidr\u00f3geno por cada 100 g de aluminio sea inferior a 0,2 ml, y en el caso de algunas aleaciones de aluminio especiales, dicho contenido debe mantenerse por debajo de 0,1 ml por cada 100 g de aluminio. En la producci\u00f3n real, se utiliza el m\u00e9todo de an\u00e1lisis metalogr\u00e1fico para analizar cualitativamente el grado de porosidad en la estructura de la aleaci\u00f3n de aluminio y medir as\u00ed el contenido de hidr\u00f3geno. Dado que la detecci\u00f3n de inclusiones no met\u00e1licas no puede cuantificarse con precisi\u00f3n, resulta dif\u00edcil establecer requisitos cuantitativos, y solo pueden medirse mediante el an\u00e1lisis metalogr\u00e1fico de la estructura del lingote. Por \u00faltimo, se eval\u00faa de forma exhaustiva la calidad del efecto del tratamiento de refinado de la masa fundida y se determinan los par\u00e1metros del proceso de refinado.<\/p>\n<p>Dado que el cloro es t\u00f3xico, resulta perjudicial para la salud humana y corroe gravemente los equipos circundantes. Por ello, el tratamiento actual de refinado met\u00e1lico del aluminio fundido reciclado suele recurrir a un proceso de purificaci\u00f3n en l\u00ednea mediante gas N\u2082 o una mezcla de N\u2082 y Cl\u2082.<\/p>\n<p>Dado que el nitr\u00f3geno es qu\u00edmicamente inactivo, no reacciona qu\u00edmicamente con la masa fundida de aleaci\u00f3n de aluminio regenerada ni con otros gases disueltos a la temperatura de refinado, ni es soluble en la masa fundida, por lo que puede formarse un gran n\u00famero de burbujas cuando se introduce nitr\u00f3geno en la masa fundida.<\/p>\n<p>En estas burbujas de nitr\u00f3geno, la presi\u00f3n parcial de hidr\u00f3geno es cero, mientras que en la masa fundida es mucho mayor que cero. Por lo tanto, existe una gran diferencia de presi\u00f3n parcial entre el material fundido y las burbujas de nitr\u00f3geno, y el hidr\u00f3geno del material fundido sigue fluyendo hacia las burbujas. Se difunde y entra en la burbuja hasta que la presi\u00f3n parcial del hidr\u00f3geno en la burbuja aumenta hasta igualarse a la presi\u00f3n parcial del hidr\u00f3geno en el material fundido, y se alcanza el equilibrio.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-9929\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2021\/08\/Gas-Purification-Process.jpg\" alt=\"Proceso de purificaci\u00f3n de gases\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/08\/Gas-Purification-Process.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/08\/Gas-Purification-Process-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Cuando un gran n\u00famero de burbujas de nitr\u00f3geno salen flotando del material fundido, el hidr\u00f3geno contenido en las burbujas se escapa a la atm\u00f3sfera, por lo que se generan burbujas de forma continua; es decir, el hidr\u00f3geno disuelto en el material fundido puede eliminarse de forma continua. Durante el proceso de flotaci\u00f3n de las burbujas, cuando estas se encuentran con inclusiones, debido al efecto de la tensi\u00f3n superficial, las inclusiones se adhieren a la superficie de las burbujas y se eliminan a medida que estas ascienden. Como resultado, las inclusiones tambi\u00e9n se eliminan al mismo tiempo que se elimina el gas.<\/p>\n<p><a href=\"http:\/\/www.alalloycasting.com\/es\/degassing-with-nitrogen\/\">Desgasificaci\u00f3n con nitr\u00f3geno<\/a> En el proceso de fundici\u00f3n de aleaciones de aluminio reciclado, la temperatura de refinado debe mantenerse dentro del intervalo de 690-710 \u2103. Si la temperatura es demasiado alta, el nitr\u00f3geno puede reaccionar qu\u00edmicamente con el aluminio. La presi\u00f3n de nitr\u00f3geno se mantiene dentro del intervalo de 10~15 kPa.<\/p>","protected":false},"excerpt":{"rendered":"<p>Metal refining treatment can remove or minimize the gas and oxide inclusions in the regenerated aluminum alloy melt, so as to improve the degree of&hellip;<\/p>","protected":false},"author":1,"featured_media":9988,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-9987","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>Metal Refining Treatment, Degassing With Nitrogen<\/title>\n<meta name=\"description\" content=\"Metal refining treatment can remove the gas and oxide inclusions in the aluminum alloy melt, so as to improve the melt purification 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