{"id":5450,"date":"2020-10-10T07:32:44","date_gmt":"2020-10-10T07:32:44","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5450"},"modified":"2020-10-10T07:32:44","modified_gmt":"2020-10-10T07:32:44","slug":"nitrogen-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/nitrogen-refining\/","title":{"rendered":"Refinado de nitr\u00f3geno"},"content":{"rendered":"

El refinado con nitr\u00f3geno suele requerir una temperatura m\u00e1s baja del aluminio fundido; aunque la reducci\u00f3n de la temperatura disminuye la velocidad de difusi\u00f3n del hidr\u00f3geno at\u00f3mico en el aluminio fundido, aumenta la viscosidad de este y prolonga el tiempo de flotaci\u00f3n de las burbujas, lo que favorece la difusi\u00f3n del hidr\u00f3geno hacia el nitr\u00f3geno en las burbujas. Al mismo tiempo, tambi\u00e9n puede reducir la tendencia a la oxidaci\u00f3n provocada por la entrada de aire.<\/p>\n

La naturaleza y la pureza del propio gas, la densidad y la viscosidad del gas refinado, la capacidad de humectaci\u00f3n y la capacidad t\u00e9rmica de las inclusiones influyen en el efecto de refinado con nitr\u00f3geno. Cuanto mayor sea la densidad del gas y mayor su viscosidad, mayor ser\u00e1 la velocidad de flotaci\u00f3n en el aluminio fundido. Cuanto m\u00e1s lenta sea la velocidad, mayor ser\u00e1 el tiempo de permanencia, lo que favorece la mejora del efecto de refinado; pero cuanto menor sea la densidad del gas, mayor ser\u00e1 el volumen de gas por unidad de peso y mayor ser\u00e1 el \u00e1rea de contacto con el aluminio fundido, lo que tambi\u00e9n favorece la mejora del efecto de refinado. La pr\u00e1ctica ha demostrado que el factor decisivo en el proceso de desgasificaci\u00f3n no es la densidad del gas, sino su volumen, su grado de dispersi\u00f3n en el aluminio fundido y el tama\u00f1o de las burbujas. Cuanto m\u00e1s peque\u00f1a es la burbuja, m\u00e1s difusa y uniforme es, mayor es su superficie y m\u00e1s lenta es su velocidad de flotaci\u00f3n en el aluminio fundido, lo que aumenta la tasa de aprovechamiento del gas y mejora el efecto de refinado del nitr\u00f3geno.<\/p>\n

Control del tama\u00f1o y la uniformidad de las burbujas. El tama\u00f1o y la uniformidad de las burbujas dependen del caudal de gas y de la velocidad de rotaci\u00f3n del rotor durante el funcionamiento real. En t\u00e9rminos sencillos: si el caudal de gas es demasiado elevado, se generar\u00e1n burbujas m\u00e1s grandes en el aluminio fundido, y el fen\u00f3meno de remolino en la superficie del aluminio fundido har\u00e1 que las impurezas flotantes vuelvan a introducirse f\u00e1cilmente en el aluminio fundido, lo que provocar\u00e1 un desperdicio del trabajo de refinado y afectar\u00e1 al resultado del mismo: Si la cantidad de gas introducida es demasiado peque\u00f1a, el n\u00famero de burbujas capaces de ejercer un efecto de refinado en el aluminio fundido es limitado, por lo que tampoco se obtiene el efecto deseado.<\/p>\n

\"Refinado<\/p>\n

La velocidad de rotaci\u00f3n del unidad de desgasificaci\u00f3n<\/a> El rotor debe mantenerse a un nivel elevado para producir burbujas de aire finas y uniformes que se dispersen y distribuyan por toda la soluci\u00f3n. Cuando la velocidad de rotaci\u00f3n es demasiado baja, se generan burbujas m\u00e1s grandes que se acumulan alrededor del rotor, lo que reduce la superficie espec\u00edfica de las burbujas. Una velocidad de rotaci\u00f3n demasiado alta puede provocar f\u00e1cilmente corrientes par\u00e1sitas en la superficie del aluminio fundido, centradas en la barra giratoria, lo que har\u00e1 que las impurezas flotantes vuelvan a introducirse en el aluminio fundido. Al mismo tiempo, tambi\u00e9n afectar\u00e1 a la vida \u00fatil de la barra giratoria.<\/p>","protected":false},"excerpt":{"rendered":"

Nitrogen refining generally requires a lower temperature of the molten aluminum, although lowering the temperature reduces the diffusion rate of atomic hydrogen in the molten…<\/p>","protected":false},"author":1,"featured_media":5452,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5450","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nNitrogen Refining by Degassing Unit for Molten Aluminum<\/title>\n<meta name=\"description\" content=\"Nitrogen refining generally requires a lower temperature of molten aluminum, although lowering the temperature reduces the diffusion rate...\" \/>\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\/nitrogen-refining\/\" \/>\n<meta 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