{"id":6746,"date":"2020-11-27T02:53:49","date_gmt":"2020-11-27T02:53:49","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6746"},"modified":"2020-11-27T02:53:49","modified_gmt":"2020-11-27T02:53:49","slug":"molten-aluminium-purification-technology","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/molten-aluminium-purification-technology\/","title":{"rendered":"Technologie de purification de l'aluminium fondu"},"content":{"rendered":"

L'aluminium fondu est un liquide \u00e0 haute temp\u00e9rature compos\u00e9 d'aluminium alli\u00e9 et d'alliages d'aluminium, obtenu soit directement, soit par m\u00e9lange d'aluminium primaire (lingots d'aluminium ou aluminium \u00e9lectrolytique) avec d'autres \u00e9l\u00e9ments d'alliage, au moyen d'un proc\u00e9d\u00e9 de fusion \u00e0 haute temp\u00e9rature. Lors de la fusion de l\u2019aluminium et des alliages d\u2019aluminium, on observe la formation de scories oxyd\u00e9es et de gettering, ce qui entra\u00eene une contamination plus ou moins importante de l\u2019aluminium liquide \u00e0 haute temp\u00e9rature par des impuret\u00e9s. En particulier, les masses fondues d\u2019aluminium et d\u2019alliages d\u2019aluminium contiennent une grande quantit\u00e9 d\u2019hydrog\u00e8ne ainsi que des inclusions m\u00e9talliques et non m\u00e9talliques. Si les substances nocives susmentionn\u00e9es ne peuvent pas \u00eatre \u00e9limin\u00e9es \u00e0 temps avant la coul\u00e9e, des d\u00e9fauts de coul\u00e9e tels que des pores, des inclusions et des d\u00e9fauts de compactage se formeront \u00e0 l\u2019int\u00e9rieur et \u00e0 la surface de la pi\u00e8ce moul\u00e9e, ce qui affectera gravement les propri\u00e9t\u00e9s physiques, chimiques, m\u00e9caniques et diverses propri\u00e9t\u00e9s de transformation ult\u00e9rieure de la pi\u00e8ce moul\u00e9e, entra\u00eenant ainsi une grande quantit\u00e9 de d\u00e9chets. C\u2019est pourquoi l\u2019aluminium fondu doit \u00eatre purifi\u00e9. \u00c0 l\u2019heure actuelle, les techniques de purification de l\u2019aluminium fondu comprennent deux types de proc\u00e9d\u00e9s : la purification en four et la purification hors four.<\/p>\n

La technologie de purification en four est une technique de purification de l'aluminium fondu utilis\u00e9e dans les fours de fusion d'aluminium lors du processus de fusion de l'aluminium et des alliages d'aluminium ; elle comprend le d\u00e9gazage et l'\u00e9limination des scories.<\/p>\n

Cette technologie peut \u00eatre class\u00e9e en deux cat\u00e9gories : les technologies de traitement par purification par adsorption et les technologies de traitement par purification sans adsorption :<\/strong><\/p>\n

La m\u00e9thode d'adsorption repose principalement sur le flux pour produire un effet d'absorption des inclusions d'oxydation rigides, tout en \u00e9liminant les inclusions d'oxydation et l'hydrog\u00e8ne adsorb\u00e9 \u00e0 la surface, afin d'assurer la purification de l'aluminium fondu. L'effet de purification de la m\u00e9thode d'adsorption ne se produit qu'au niveau de l'interface d'adsorption. La m\u00e9thode d'adsorption comprend principalement la purge par gaz unique, la purge par m\u00e9lange de gaz, la purification par sel de chlore et l'affinage par flux.<\/p>\n

La m\u00e9thode sans adsorption s'appuie principalement sur d'autres effets physiques et chimiques pour purifier l'aluminium liquide. Elle comprend notamment le traitement de purification sous vide (traitement sous vide statique, traitement sous vide dynamique), le traitement de purification par ultrasons, le traitement de purification \u00e9lectromagn\u00e9tique, la m\u00e9thode de cristallisation sous pression, la m\u00e9thode de l'hydrog\u00e8ne solide \u00e0 base d'\u00e9l\u00e9ments de terres rares, etc.<\/p>\n

La technologie de purification de l'aluminium fondu (d\u00e9gazage et filtration) hors du four est une technologie de d\u00e9gazage et de scellement en continu utilis\u00e9e dans le processus de coul\u00e9e de l'aluminium fondu. La m\u00e9thode de purification par d\u00e9gazage (hydrog\u00e8ne) hors du four est en r\u00e9alit\u00e9 la m\u00e9thode de flottation par bulles : une technique sp\u00e9cifique permet de g\u00e9n\u00e9rer un grand nombre de bulles dans l\u2019aluminium fondu, en exploitant la diff\u00e9rence de pression partielle entre l\u2019hydrog\u00e8ne pr\u00e9sent dans l\u2019aluminium fondu et celui des bulles, de sorte que l\u2019hydrog\u00e8ne pr\u00e9sent dans l\u2019aluminium fondu p\u00e9n\u00e8tre en continu dans les bulles et flotte dans l\u2019aluminium fondu, avant de s\u2019\u00e9chapper finalement de la surface du liquide avec les bulles. L\u2019objectif est d\u2019\u00e9liminer l\u2019hydrog\u00e8ne. Parall\u00e8lement, une partie des scories est \u00e9vacu\u00e9e au cours du processus de flottation des bulles, ce qui permet d\u2019obtenir une s\u00e9paration entre les scories et le liquide.<\/p>\n

\"Technologie<\/p>\n

En ce qui concerne les dispositifs de purification install\u00e9s \u00e0 l'ext\u00e9rieur du four, ceux couramment utilis\u00e9s aujourd'hui sont les dispositifs de purification par d\u00e9gazage \u00e0 injection rotative, tels que le dispositif SNIF de la soci\u00e9t\u00e9 am\u00e9ricaine Pyrotek, le dispositif Aplur de la soci\u00e9t\u00e9 fran\u00e7aise Novelis, le dispositif GBF de la soci\u00e9t\u00e9 japonaise Fujiko et le dispositif de d\u00e9gazage TKR, \u00e9galement japonais. L'exemple le plus repr\u00e9sentatif est le d\u00e9gazeur sous vide fabriqu\u00e9 par Hydro Corporation, et \u00e9quipements de d\u00e9gazage en ligne<\/a> d'AdTech China.<\/p>\n

Bien qu\u2019il existe de nombreux types d\u2019\u00e9quipements de purification par d\u00e9gazage \u00e0 jet rotatif, tant en France qu\u2019\u00e0 l\u2019\u00e9tranger, ceux-ci sont g\u00e9n\u00e9ralement install\u00e9s entre l\u2019orifice de d\u00e9charge du four et le caisson de filtration. Le principe du d\u00e9gazage est le suivant : l\u2019aluminium liquide \u00e0 haute temp\u00e9rature traverse le corps du caisson de d\u00e9gazage pour y circuler et y passer, puis effectue une rotation. Le rotor fragmente le gaz inerte inject\u00e9 dans l\u2019aluminium fondu par le plateau tournant en un grand nombre de bulles dispers\u00e9es, qu\u2019il r\u00e9partit dans l\u2019aluminium fondu. Les bulles pr\u00e9sentes dans l\u2019aluminium liquide, gr\u00e2ce \u00e0 la diff\u00e9rence de pression partielle des gaz et au principe d\u2019adsorption en surface, absorbent l\u2019hydrog\u00e8ne contenu dans l\u2019aluminium liquide, adsorbent les scories oxyd\u00e9es et sont \u00e9vacu\u00e9es de la surface de l\u2019aluminium liquide \u00e0 mesure qu\u2019elles remontent, permettant ainsi de purifier l\u2019aluminium liquide.<\/p>","protected":false},"excerpt":{"rendered":"

Molten aluminium is an alloyed aluminum and aluminum alloy high-temperature liquid formed by directly or mixing primary aluminum (aluminum ingot or electrolytic aluminum) with other…<\/p>","protected":false},"author":1,"featured_media":6748,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6746","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nMolten Aluminium Purification Technology - Degassing and Filtration<\/title>\n<meta name=\"description\" content=\"The molten aluminium purification technology outside the furnace is online degassing and filtering technology, used in the casting process.\" \/>\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-aluminium-purification-technology\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Molten Aluminium Purification Technology - 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