{"id":12377,"date":"2022-01-20T05:56:53","date_gmt":"2022-01-20T05:56:53","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=12377"},"modified":"2022-02-22T09:14:16","modified_gmt":"2022-02-22T09:14:16","slug":"secondary-aluminum-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/secondary-aluminum-refining\/","title":{"rendered":"Raffinage de l'aluminium secondaire"},"content":{"rendered":"<p>Un affinage secondaire de l'aluminium (traitement de purification) doit \u00eatre effectu\u00e9 afin d'\u00e9liminer les inclusions et les gaz pr\u00e9sents dans l'aluminium fondu et ses alliages.<\/p>\n<p>La fonte d'aluminium secondaire contient des inclusions et des gaz qui nuisent \u00e0 la qualit\u00e9 des pi\u00e8ces moul\u00e9es (lingots) et compliquent les \u00e9tapes de transformation ult\u00e9rieures (notamment la refonte et le traitement sous pression). Par cons\u00e9quent,<\/p>\n<p>Afin que l'alliage d'aluminium secondaire soit identique ou similaire \u00e0 l'alliage pr\u00e9par\u00e9 \u00e0 partir de l'aluminium d'origine, le processus d'affinage est r\u00e9alis\u00e9 de la m\u00eame mani\u00e8re que pour l'alliage pr\u00e9par\u00e9 \u00e0 partir de l'aluminium d'origine.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-12378\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2022\/01\/Secondary-Aluminum-Refining-2.jpg\" alt=\"Raffinage de l&#039;aluminium secondaire\" width=\"600\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2022\/01\/Secondary-Aluminum-Refining-2.jpg 600w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2022\/01\/Secondary-Aluminum-Refining-2-300x200.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>Bien que les d\u00e9chets d'aluminium aient \u00e9t\u00e9 tri\u00e9s et pr\u00e9trait\u00e9s, il est difficile d'\u00e9viter que leur teneur en impuret\u00e9s ne d\u00e9passe la norme. Il faut s'efforcer d'\u00e9liminer les substances nocives ; dans le cas contraire, il faudra compl\u00e9ter ou diluer les composants.<\/p>\n<p>Il existe deux types d'impuret\u00e9s dans l'aluminium primaire : les impuret\u00e9s m\u00e9talliques et les impuret\u00e9s non m\u00e9talliques. Les impuret\u00e9s m\u00e9talliques comprennent le fer, le silicium, le cuivre, le sodium, le titane, le vanadium, le mangan\u00e8se, le chrome et le magn\u00e9sium, parmi lesquelles le fer, le silicium et le cuivre constituent les principales impuret\u00e9s m\u00e9talliques. Les impuret\u00e9s non m\u00e9talliques comprennent l'oxyde d'aluminium, les sels fluor\u00e9s, les r\u00e9sidus de carbone, les produits de carbonisation de l'aluminium, le nitrure d'aluminium, etc. \u00c0 cela s'ajoutent l'hydrog\u00e8ne, le dioxyde de carbone, le monoxyde de carbone, etc., pr\u00e9sents \u00e0 l'\u00e9tat gazeux. Ces impuret\u00e9s non m\u00e9talliques sont principalement constitu\u00e9es d'alumine et d'hydrog\u00e8ne.<\/p>\n<p>La teneur en hydrog\u00e8ne \u00e0 l'\u00e9tat satur\u00e9 de l'aluminium fondu augmente avec la temp\u00e9rature : elle est par exemple de 0,67 ml\/100 gAl \u00e0 660 \u00b0C et de 1,237 ml\/100 gAl \u00e0 750 \u00b0C. Une teneur \u00e9lev\u00e9e en hydrog\u00e8ne n'est pas souhaitable pour la production des clients en aval. Ces impuret\u00e9s non m\u00e9talliques n'apportent aucun avantage \u00e0 l'aluminium, affectent les propri\u00e9t\u00e9s m\u00e9caniques du produit et font l'objet d'un processus de purification.<\/p>\n<p>L'objectif de <a href=\"http:\/\/www.alalloycasting.com\/fr\/molten-aluminum-purification\/\">purification de l'aluminium<\/a> consiste \u00e0 \u00e9liminer diverses impuret\u00e9s non m\u00e9talliques pr\u00e9sentes dans l'aluminium fondu et \u00e0 obtenir de l'aluminium fondu relativement pur destin\u00e9 \u00e0 la fabrication de lingots.<\/p>\n<p>Les m\u00e9thodes de purification de l'aluminium primaire comprennent principalement la m\u00e9thode de refroidissement et de d\u00e9gazage, la m\u00e9thode de d\u00e9gazage par agitation et d\u00e9cantation avec \u00e9limination des scories, la m\u00e9thode de solidification-refusion, la m\u00e9thode de purification par m\u00e9lange d'azote et de chlore, la m\u00e9thode de purification par fondant, la m\u00e9thode combin\u00e9e de purification par filtration et soufflage d'air, ainsi que la filtration sur toile de verre, etc.<\/p>\n<p>Les exigences en mati\u00e8re de purification n'\u00e9tant pas trop strictes dans la production de lingots d'aluminium destin\u00e9s \u00e0 la refonte, la m\u00e9thode de purification par fondant est actuellement couramment utilis\u00e9e dans la production nationale.<\/p>\n<p>Une fois que le four est enti\u00e8rement rempli d'aluminium fondu, on y ajoute la quantit\u00e9 proportionnelle d'agent de d\u00e9cantation de scories d'aluminium fondu. La fonction de l' <a href=\"http:\/\/www.alalloycasting.com\/fr\/slag-remover\/\">d\u00e9capeur de scories<\/a> consiste \u00e0 modifier la mouillabilit\u00e9 du laitier et de l'aluminium, \u00e0 augmenter la tension superficielle \u00e0 l'interface entre le laitier et l'aluminium, et \u00e0 emp\u00eacher l'aluminium de mouiller le laitier. En cas d\u2019agitation, l\u2019aluminium fondu et les scories sont efficacement s\u00e9par\u00e9s, et les scories se transforment en une poudre s\u00e8che capable de dissoudre l\u2019alumine pr\u00e9sente dans l\u2019aluminium fondu ou de l\u2019adsorber \u00e0 sa surface, ce qui permet d\u2019atteindre l\u2019objectif d\u2019\u00e9limination des scories. .<\/p>\n<p>La m\u00e9thode d'ajout consiste g\u00e9n\u00e9ralement \u00e0 r\u00e9partir uniform\u00e9ment le solvant \u00e0 la surface de l'aluminium fondu, puis \u00e0 utiliser l'outil de raclage des scories pour bien m\u00e9langer le tout, afin que le solvant et l'aluminium fondu soient en bon contact et r\u00e9agissent. Pendant le m\u00e9lange, une partie du gaz pr\u00e9sent dans l'aluminium fondu peut \u00e9galement \u00eatre lib\u00e9r\u00e9e. Apr\u00e8s avoir retir\u00e9 les scories d'aluminium form\u00e9es, il convient de laisser reposer le m\u00e9lange pendant environ 30 minutes, afin que les gaz pr\u00e9sents dans l'aluminium fondu puissent \u00e0 nouveau s'\u00e9chapper compl\u00e8tement, apr\u00e8s quoi la coul\u00e9e peut commencer.<\/p>","protected":false},"excerpt":{"rendered":"<p>Secondary aluminum refining (purification treatment) must be carried out to remove inclusions and gases in molten aluminum and alloy. The secondary aluminum melt contains inclusions&hellip;<\/p>","protected":false},"author":1,"featured_media":12378,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-12377","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Secondary Aluminum Refining with Slag Remover Flux<\/title>\n<meta name=\"description\" content=\"Secondary aluminum refining (purification treatment) must be carried out to remove inclusions and gases in molten aluminum and alloy.\" \/>\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\/secondary-aluminum-refining\/\" \/>\n<meta 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