{"id":9838,"date":"2021-08-10T08:12:40","date_gmt":"2021-08-10T08:12:40","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=9838"},"modified":"2021-08-10T08:12:40","modified_gmt":"2021-08-10T08:12:40","slug":"aluminum-degassing-box","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminum-degassing-box\/","title":{"rendered":"Bo\u00eete de d\u00e9gazage en aluminium"},"content":{"rendered":"

Avec le d\u00e9veloppement rapide des technologies de transformation de l\u2019aluminium, les exigences de qualit\u00e9 relatives aux produits en aluminium ne cessent de s\u2019accro\u00eetre. La question de savoir comment purifier au mieux l\u2019aluminium fondu et \u00e9liminer les d\u00e9fauts internes des produits en aluminium suscite un int\u00e9r\u00eat g\u00e9n\u00e9ral au sein de l\u2019industrie de la transformation de l\u2019aluminium dans divers pays. La pratique industrielle montre que la m\u00e9thode de flottation par bulles est actuellement l\u2019une des plus efficaces pour purifier l\u2019aluminium fondu. Elle utilise une buse rotative (rotor en graphite) pour pulv\u00e9riser un gaz inerte dans l\u2019aluminium liquide. L\u2019\u00e9quipement cl\u00e9 de la m\u00e9thode de flottation par bulles pour purifier l\u2019aluminium fondu est le unit\u00e9 de d\u00e9gazage<\/a>, et le rotor en graphite est la principale pi\u00e8ce d'usure du caisson de d\u00e9gazage de l'aluminium.<\/p>\n

Lorsque le caisson de d\u00e9gazage de l'aluminium fondu est en fonctionnement, le rotor en graphite tourne \u00e0 une vitesse constante de 200 \u00e0 300 tr\/min, et le gaz, \u00e0 une pression et un d\u00e9bit d\u00e9termin\u00e9s, est introduit par la partie sup\u00e9rieure de la colonne du rotor, puis inject\u00e9 \u00e0 travers les pores situ\u00e9s autour de la t\u00eate du rotor, via le canal de gaz situ\u00e9 \u00e0 l'int\u00e9rieur de la colonne du rotor. Dans l\u2019aluminium liquide contenu dans la cuve de d\u00e9gazage, des bulles sont continuellement expuls\u00e9es. Lorsque les pales de la t\u00eate du rotor tournent, elles remplissent une double fonction : elles brassent l\u2019aluminium fondu et affinent les bulles, ce qui provoque la remont\u00e9e d\u2019un grand nombre de petites bulles dans l\u2019aluminium fondu le long d\u2019une trajectoire en spirale jusqu\u2019\u00e0 ce qu\u2019elles s\u2019\u00e9chappent \u00e0 la surface de l\u2019aluminium fondu, achevant ainsi le processus de d\u00e9gazage et de purification. De toute \u00e9vidence, ce processus de purification impose des exigences plus \u00e9lev\u00e9es au mat\u00e9riau en graphite utilis\u00e9 pour la fabrication du rotor.<\/p>\n

Le rotor en graphite tourne \u00e0 haute temp\u00e9rature et est au rouge. Parall\u00e8lement, il subit le double effet de l\u2019oxydation \u00e0 haute temp\u00e9rature et de l\u2019\u00e9rosion par l\u2019aluminium en fusion, ce qui entra\u00eene son usure progressive, en particulier au niveau de la partie en contact avec la surface de l\u2019aluminium en fusion, o\u00f9 les pertes sont les plus importantes. De plus, en raison des arr\u00eats normaux et exceptionnels, des r\u00e9visions et d\u2019autres raisons li\u00e9es \u00e0 la production de coul\u00e9e et de laminage de l\u2019aluminium, il est souvent n\u00e9cessaire de retirer le rotor, encore incandescent, de l\u2019aluminium en fusion et de l\u2019exposer \u00e0 l\u2019air. Par cons\u00e9quent, le graphite utilis\u00e9 pour le rotor doit pr\u00e9senter une r\u00e9sistance m\u00e9canique et une r\u00e9sistance \u00e0 l\u2019\u00e9rosion \u00e9lev\u00e9es, ainsi qu\u2019une bonne r\u00e9sistance \u00e0 l\u2019oxydation et \u00e0 la corrosion.<\/p>","protected":false},"excerpt":{"rendered":"

With the rapid development of aluminum processing technology, the quality requirements for aluminum products are getting higher and higher. How to better purify the aluminum…<\/p>","protected":false},"author":1,"featured_media":9839,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[12341,659,324,4315,4313],"class_list":["post-9838","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-degassing-unit","tag-aluminum-dgeassing","tag-degassing-box","tag-degassing-system","tag-graphite-rotor","tag-metal-degassing"],"yoast_head":"\nAluminum Degassing Box -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"The key equipment for the bubble floatation method to purify molten aluminum is the degassing box, and the graphite rotor is the main part.\" \/>\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\/aluminum-degassing-box\/\" \/>\n<meta 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