{"id":6165,"date":"2020-11-03T08:57:57","date_gmt":"2020-11-03T08:57:57","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6165"},"modified":"2020-11-03T08:57:57","modified_gmt":"2020-11-03T08:57:57","slug":"refining-of-aluminum","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/refining-of-aluminum\/","title":{"rendered":"Raffinage de l'aluminium"},"content":{"rendered":"

La pr\u00e9sence de scories provoque des rayures, des obstructions et des d\u00e9chirures du profil\u00e9 au niveau de la fili\u00e8re d'extrusion. La tige en alliage 6063 \u00e9tant directement coul\u00e9e \u00e0 partir d'aluminium liquide \u00e9lectrolytique, la quantit\u00e9 de scories contenue dans l'aluminium liquide est importante, ce qui conf\u00e8re une importance particuli\u00e8re au processus d'affinage de l'aluminium. Lors de l'affinage, nous prenons principalement les mesures suivantes :<\/p>\n

    \n
  1. Optez pour des produits de haute qualit\u00e9 agents de raffinage<\/a>. Certains agents d'affinage ont une faible teneur en Na\u2083AlF\u2086 (cryolite), et leur efficacit\u00e9 en mati\u00e8re d'\u00e9limination des scories et des gaz est tr\u00e8s faible.<\/li>\n
  2. Passer d'un affinage primaire \u00e0 un affinage secondaire de renforcement. Le premier dosage est de 3 \u00e0 4 kg par tonne d'aluminium ; le deuxi\u00e8me affinage intensif utilise 2 \u00e0 3 kg de bain de fusion par tonne d'aluminium, sans laisser de zones non trait\u00e9es, en veillant \u00e0 bien m\u00e9langer et \u00e0 affiner le tout.<\/li>\n
  3. La cloche \u00e0 vide est enfonc\u00e9e dans le bain de fusion afin d'effectuer l'affinage par injection de poudre d'azote.<\/li>\n
  4. Afin d'\u00e9viter la r\u00e9oxydation de l'aluminium fondu, une couche d'agent de recouvrement est saupoudr\u00e9e dans le bain de fusion apr\u00e8s l'affinage, puis celui-ci est coul\u00e9 apr\u00e8s un temps de repos de 20 minutes.<\/li>\n
  5. Filtrer par filtre en mousse c\u00e9ramique<\/a> pendant la coul\u00e9e. Laisser le m\u00e9tal en fusion s'\u00e9couler \u00e0 travers celui-ci, puis proc\u00e9der \u00e0 un d\u00e9scellement secondaire.<\/li>\n<\/ol>\n

    AdTech apporte une solution sp\u00e9cifique au probl\u00e8me des inclusions de scories dans l'aluminium fondu. AdTech propose \u00e9quipements de d\u00e9gazage en ligne<\/a>, des plaques filtrantes en mousse c\u00e9ramique, du flux pour la coul\u00e9e d'aluminium, des goulottes de coul\u00e9e et d'autres mat\u00e9riaux r\u00e9fractaires.<\/p>\n

    \"Raffinage<\/p>\n

    La cuve de d\u00e9gazage sert principalement \u00e0 \u00e9liminer l'hydrog\u00e8ne (H) et les scories de l'aluminium fondu. Elle fonctionne selon le principe de la flottation \u00e0 l'air. Le rotor aspire un gaz inerte ou un m\u00e9lange de chlore et de gaz inerte dans l'aluminium fondu, puis le pulv\u00e9rise en petites bulles dispers\u00e9es. Les bulles remontent \u00e0 la surface de l'aluminium fondu et effectuent simultan\u00e9ment les op\u00e9rations suivantes : l'hydrog\u00e8ne est absorb\u00e9 par les bulles et \u00e9limin\u00e9, tandis que le chlorure et les scories sont \u00e9limin\u00e9s.<\/p>\n

    Syst\u00e8me de filtrage CFF<\/a> Il est utilis\u00e9 pour filtrer et purifier l'aluminium fondu, en association avec un filtre en mousse c\u00e9ramique. Il permet de filtrer les inclusions et les particules infimes pr\u00e9sentes dans l'aluminium fondu. Il est particuli\u00e8rement adapt\u00e9 \u00e0 la coul\u00e9e d'aluminium de haute puret\u00e9 et d'alliages d'aluminium de haute pr\u00e9cision. Il pr\u00e9sente les avantages suivants : r\u00e9sistance thermique, r\u00e9sistance \u00e0 l'oxydation, r\u00e9sistance \u00e0 la corrosion, chauffage rapide, longue dur\u00e9e de vie et r\u00e9sistance aux acides.<\/p>","protected":false},"excerpt":{"rendered":"

    Slag inclusion causes scratches, blockages and profile tearing of the extrusion die. Because the 6063 alloy rod is directly cast with electrolytic aluminum liquid, the…<\/p>","protected":false},"author":1,"featured_media":6167,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6165","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nRefining of Aluminum | Online Degassing and CFF Filtering<\/title>\n<meta name=\"description\" content=\"The amount of slag contained in the aluminum liquid is large, which makes the refining process of aluminum particularly important.\" \/>\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\/refining-of-aluminum\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" 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