{"id":4026,"date":"2020-08-23T03:00:45","date_gmt":"2020-08-23T03:00:45","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4026"},"modified":"2020-08-23T03:00:45","modified_gmt":"2020-08-23T03:00:45","slug":"molten-aluminum-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/molten-aluminum-refining\/","title":{"rendered":"Affinage de l'aluminium fondu"},"content":{"rendered":"

Au cours de l'affinage de l'aluminium fondu, les atomes d'hydrog\u00e8ne dissous dans l'aluminium fondu migrent vers la p\u00e9riph\u00e9rie de la bulle d'affinage (Ar ou N), s'adsorbent autour de celle-ci, se combinent avec des mol\u00e9cules d'hydrog\u00e8ne \u00e0 l'int\u00e9rieur de la bulle, puis remontent \u00e0 la surface avec la mousse. C'est le processus dynamique observ\u00e9 notamment dans le fluide de coul\u00e9e de l'aluminium. Il s'agit d'un processus au cours duquel l'hydrog\u00e8ne se diffuse en phase liquide et est absorb\u00e9 par les bulles.<\/p>\n

Affinage de l'aluminium fondu<\/h2>\n

Au cours du processus de fusion d'un alliage d'aluminium, flux de raffinage<\/a> est ajout\u00e9 \u00e0 la masse fondue afin d'\u00e9liminer les inclusions d'oxyde gr\u00e2ce \u00e0 une s\u00e9rie d'actions physiques et chimiques. La capacit\u00e9 du clarifiant \u00e0 \u00e9liminer les impuret\u00e9s d\u00e9pend de son adsorption et de sa dissolution sur les inclusions d\u2019oxyde pr\u00e9sentes dans la masse fondue, ainsi que de son action chimique au sein de celle-ci. Plus la tension interfaciale entre le flux d\u2019affinage et l\u2019inclusion d\u2019oxyde est faible, meilleur est l\u2019effet d\u2019adsorption et plus l\u2019\u00e9limination de l\u2019inclusion d\u2019oxyde est efficace.<\/p>\n

Le flux de raffinage d'AdTech repose sur un principe de combinaison de m\u00e9taux fondus, qui guide la recherche, le d\u00e9veloppement et la mise au point du produit. Il permet de r\u00e9duire les fum\u00e9es et de limiter les pertes li\u00e9es \u00e0 la combustion, ce qui contribue \u00e0 la protection de l'environnement tout en \u00e9tant \u00e9conomique.<\/p>\n

\"Affinage<\/p>\n

Les m\u00e9thodes permettant d'am\u00e9liorer la vitesse d'affinage de l'aluminium fondu sont les suivantes :<\/p>\n

(1) Augmenter autant que possible le nombre de bulles et accro\u00eetre la surface de contact effective entre l'aluminium fondu et les bulles.<\/p>\n

(2) Le diam\u00e8tre des bulles doit \u00eatre r\u00e9duit autant que possible, et la vitesse de d\u00e9placement des bulles dans l'aluminium fondu doit \u00eatre augment\u00e9e sans provoquer d'\u00e9claboussures \u00e0 la surface de l'aluminium fondu.<\/p>\n

(3) Cela permet de r\u00e9duire efficacement la distance de diffusion de l'hydrog\u00e8ne dissous dans l'aluminium fondu, ce qui revient \u00e0 am\u00e9liorer le processus de diffusion ou la capacit\u00e9 de transfert de masse.<\/p>\n

(4) La distance de flottement des bulles dans l'aluminium fondu doit \u00eatre allong\u00e9e autant que possible afin d'augmenter le temps de s\u00e9jour des bulles dans l'aluminium fondu.<\/p>\n

(5) En utilisant un gaz inerte de haute puret\u00e9, un gaz r\u00e9actif insoluble dans l'aluminium fondu ou en recourant \u00e0 l'affinage sous vide, la concentration en hydrog\u00e8ne \u00e0 l'interface bulle-liquide dans l'aluminium fondu tend vers z\u00e9ro.<\/p>","protected":false},"excerpt":{"rendered":"

During molten aluminum refining, the hydrogen atoms dissolved in molten aluminum migrate to the periphery of the refining bubble (Ar or N) and adsorb around…<\/p>","protected":false},"author":1,"featured_media":4028,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-4026","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nMolten Aluminum Refining Methods to Improve the Refining Speed<\/title>\n<meta name=\"description\" content=\"Molten Aluminum Refining Methods to Improve the Refining Speed: Increase the number of bubbles and the effective contact surface area.\" \/>\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\/molten-aluminum-refining\/\" \/>\n<meta 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