Purification des gaz<\/a> Il s'agit de la principale m\u00e9thode de purification de l'aluminium primaire. Le gaz utilis\u00e9 est le chlore, l'azote ou un m\u00e9lange de chlore et d'azote. Un m\u00e9lange de chlore et d\u2019azote est utilis\u00e9 pour purifier l\u2019aluminium fondu. Son r\u00f4le est, d\u2019une part, d\u2019\u00e9liminer l\u2019hydrog\u00e8ne et de s\u00e9parer les oxydes, et, d\u2019autre part, d\u2019\u00e9liminer certaines impuret\u00e9s m\u00e9talliques pr\u00e9sentes dans l\u2019aluminium (telles que le magn\u00e9sium). La composition couramment utilis\u00e9e est 90% d\u2019azote + 10% de chlore. Il existe \u00e9galement un m\u00e9lange compos\u00e9 de 10% de chlore + 10% de dioxyde de carbone + 80% d\u2019azote. Ce m\u00e9lange offre de meilleurs r\u00e9sultats : le dioxyde de carbone permet une bonne diffusion du chlore et de l\u2019azote, ce qui permet de r\u00e9duire la dur\u00e9e de l\u2019op\u00e9ration.<\/p>\n![\"M\u00e9thodes](\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2021\/02\/Molten-Aluminum-Purification-Methods-1.jpg\")
<\/p>\n
Les lingots d'aluminium refondus ou l'aluminium fondu produit par les usines d'aluminium \u00e9lectrolytique constituent les mati\u00e8res premi\u00e8res utilis\u00e9es pour la fabrication de pi\u00e8ces moul\u00e9es en aluminium. L'avantage du moulage de l'aluminium r\u00e9side dans le fait qu'il permet d'obtenir un produit proche de la forme finale, ce qui garantit une productivit\u00e9 maximale et r\u00e9duit au minimum les op\u00e9rations d'usinage ult\u00e9rieures.<\/p>\n
Pendant le chargement et la pr\u00e9paration du four de maintien, une \u00e9paisse couche de scories d'aluminium (liquides ou solides) se forme \u00e0 la surface de l'aluminium fondu. Ces scories contiennent une grande quantit\u00e9 d'oxyde d'aluminium, et ces oxydes doivent \u00e9galement \u00eatre refondus pour r\u00e9cup\u00e9rer l'aluminium ; sinon, cette partie de l'aluminium sera perdue.<\/p>\n
Une fois purifi\u00e9, l'aluminium fondu doit faire l'objet d'une analyse m\u00e9tallurgique visant \u00e0 v\u00e9rifier qu'il r\u00e9pond aux exigences du client avant de pouvoir \u00eatre coul\u00e9 pour former un produit de la forme sp\u00e9cifi\u00e9e ; il doit ensuite \u00eatre pes\u00e9 et conditionn\u00e9 avant d'\u00eatre exp\u00e9di\u00e9 au client.<\/p>","protected":false},"excerpt":{"rendered":"
In the industry, molten aluminum purification methods such as flux purification and gas purification are mainly used, and some try tube filters, ceramic foam filters,…<\/p>","protected":false},"author":1,"featured_media":7904,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-7901","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n
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