{"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\/fr\/nitrogen-refining\/","title":{"rendered":"Raffinage de l'azote"},"content":{"rendered":"

L'affinage \u00e0 l'azote n\u00e9cessite g\u00e9n\u00e9ralement une temp\u00e9rature plus basse de l'aluminium fondu ; bien que l'abaissement de la temp\u00e9rature r\u00e9duise la vitesse de diffusion de l'hydrog\u00e8ne atomique dans l'aluminium fondu, il augmente la viscosit\u00e9 de ce dernier et prolonge le temps de flottement des bulles, ce qui favorise la diffusion de l'hydrog\u00e8ne vers l'azote au sein des bulles. Par ailleurs, cela permet \u00e9galement de r\u00e9duire le risque d\u2019oxydation due \u00e0 la pr\u00e9sence d\u2019air.<\/p>\n

La nature et la puret\u00e9 du gaz lui-m\u00eame, la densit\u00e9 et la viscosit\u00e9 du gaz raffin\u00e9, le pouvoir mouillant et la capacit\u00e9 thermique des inclusions ont une incidence sur l\u2019efficacit\u00e9 de l\u2019affinage \u00e0 l\u2019azote. Plus la densit\u00e9 du gaz est \u00e9lev\u00e9e et plus sa viscosit\u00e9 est importante, plus la vitesse de flottement dans l\u2019aluminium fondu est \u00e9lev\u00e9e. Plus la vitesse est faible, plus le temps de s\u00e9jour est long, ce qui favorise l\u2019am\u00e9lioration de l\u2019effet d\u2019affinage ; mais plus la densit\u00e9 du gaz est faible, plus le volume de gaz par unit\u00e9 de poids est important, et plus la surface de contact avec l\u2019aluminium fondu est grande, ce qui contribue \u00e9galement \u00e0 am\u00e9liorer l\u2019effet d\u2019affinage. La pratique a d\u00e9montr\u00e9 que le r\u00f4le d\u00e9terminant dans le processus de d\u00e9gazage n\u2019est pas la densit\u00e9 du gaz, mais son volume, son degr\u00e9 de dispersion dans l\u2019aluminium fondu et la taille des bulles. Plus les bulles sont petites, plus elles sont diffuses et uniformes, plus leur surface est grande et plus leur vitesse de flottement dans l\u2019aluminium fondu est faible, ce qui augmente le taux d\u2019utilisation du gaz et am\u00e9liore l\u2019effet d\u2019affinage par azote.<\/p>\n

Contr\u00f4le de la taille et de l'uniformit\u00e9 des bulles. La taille et l'uniformit\u00e9 des bulles d\u00e9pendent du d\u00e9bit de gaz et de la vitesse de rotation du rotor en fonctionnement r\u00e9el. Concr\u00e8tement : si le d\u00e9bit de gaz est trop important, des bulles plus grosses se formeront dans l\u2019aluminium fondu, et le ph\u00e9nom\u00e8ne de remous \u00e0 la surface de l\u2019aluminium fondu favorisera la r\u00e9introduction des impuret\u00e9s flottantes dans le bain, ce qui entra\u00eenera un gaspillage du travail d\u2019affinage et nuira \u00e0 l\u2019efficacit\u00e9 de ce dernier ; si la quantit\u00e9 de gaz introduite est trop faible, le nombre de bulles capables d\u2019exercer un effet d\u2019affinage dans l\u2019aluminium fondu est limit\u00e9, et l\u2019effet souhait\u00e9 n\u2019est pas non plus obtenu.<\/p>\n

\"Raffinage<\/p>\n

La vitesse de rotation du unit\u00e9 de d\u00e9gazage<\/a> Le rotor doit \u00eatre maintenu \u00e0 un niveau \u00e9lev\u00e9 afin de produire des bulles d'air fines et uniformes, dispers\u00e9es et r\u00e9parties dans toute la solution. Lorsque la vitesse de rotation est trop faible, des bulles plus grosses se forment et s'accumulent autour du rotor, ce qui r\u00e9duit la surface sp\u00e9cifique des bulles. Une vitesse de rotation trop \u00e9lev\u00e9e peut facilement provoquer des courants de Foucault \u00e0 la surface de l\u2019aluminium fondu, centr\u00e9s sur la tige rotative, ce qui r\u00e9introduira les impuret\u00e9s en suspension dans l\u2019aluminium fondu. Parall\u00e8lement, cela affectera \u00e9galement la dur\u00e9e de vie de la tige rotative.<\/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\/fr\/nitrogen-refining\/\" \/>\n<meta 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