{"id":3228,"date":"2020-07-31T14:15:39","date_gmt":"2020-07-31T14:15:39","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3228"},"modified":"2020-08-20T09:59:58","modified_gmt":"2020-08-20T09:59:58","slug":"furnace-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/furnace-refining\/","title":{"rendered":"Affinage au four"},"content":{"rendered":"<p>L'affinage au four d\u00e9signe le processus d'affinage. Le pr\u00e9traitement de l'aluminium fondu comprend l'affinage au four et la purification en ligne. Les r\u00e9sultats montrent que la temp\u00e9rature de l'aluminium fondu est \u00e9lev\u00e9e et que le nombre de nucl\u00e9ations d'une nouvelle phase par unit\u00e9 de temps et par unit\u00e9 de volume est faible. La temp\u00e9rature de l\u2019aluminium liquide \u00e9lectrolytique peut d\u00e9passer 930 \u2103. Sa composition est \u00e9galement tr\u00e8s complexe : il contient de nombreuses impuret\u00e9s m\u00e9talliques telles que le Fe, le Si, le Cu et le Mg, ainsi que des impuret\u00e9s non m\u00e9talliques telles que les fluorures et les scories carbon\u00e9es ; les impuret\u00e9s gazeuses sont principalement constitu\u00e9es d\u2019hydrog\u00e8ne. Cependant, ces caract\u00e9ristiques de l\u2019aluminium liquide \u00e9lectrolytique ne permettent pas de r\u00e9pondre aux exigences de la production de lingots plats en alliage d\u2019aluminium. Afin de r\u00e9soudre ce probl\u00e8me, il est n\u00e9cessaire de soumettre l\u2019aluminium liquide \u00e9lectrolytique \u00e0 un pr\u00e9traitement avant la coul\u00e9e.<\/p>\n<h2>Affinage au four<\/h2>\n<p>L'affinage au four d\u00e9signe le <a href=\"http:\/\/www.alalloycasting.com\/fr\/aluminum-alloy-refining-process\/\">proc\u00e9d\u00e9 de raffinage<\/a> dans lequel le gaz est utilis\u00e9 pour pulv\u00e9riser de la poudre dans le four statique. L'agent d'affinage, dont les principaux composants sont le CCl\u2084 et le C\u2082Cl\u2086, est introduit dans la cuve de pulv\u00e9risation de gaz \u00e0 raison de 1,0 kg\/t. Lorsque l'agent d'affinage se transforme en bulles, il peut p\u00e9n\u00e9trer dans l'aluminium liquide \u00e9lectrolytique. Le processus d\u00e9taill\u00e9 est le suivant : apr\u00e8s pr\u00e9chauffage, l\u2019agent d\u2019affinage passe de l\u2019\u00e9tat solide \u00e0 l\u2019\u00e9tat liquide et est entour\u00e9 par la surface des bulles du r\u00e9servoir de pulv\u00e9risation de poudre sous la forme d\u2019un film de flux liquide. Le four de fusion et le r\u00e9servoir de pulv\u00e9risation de poudre sont solidement reli\u00e9s ; la buse du r\u00e9servoir de pulv\u00e9risation de poudre est ensuite plong\u00e9e dans l\u2019aluminium liquide issu de l\u2019\u00e9lectrolyse, tandis que les vannes du r\u00e9servoir sont ouvertes simultan\u00e9ment, la pression et le d\u00e9bit sont soigneusement contr\u00f4l\u00e9s, et le r\u00e9servoir de pulv\u00e9risation de poudre est d\u00e9plac\u00e9 d\u2019avant en arri\u00e8re dans le four, afin d\u2019effectuer une pulv\u00e9risation uniforme de la poudre \u00e0 des fins d\u2019affinage. La dur\u00e9e d\u2019affinage est g\u00e9n\u00e9ralement comprise entre 30 et 40 minutes, et la temp\u00e9rature d\u2019affinage est maintenue entre 730 \u2103 et 750 \u2103. De cette mani\u00e8re, la vitesse des bulles d\u2019aluminium fondu envelopp\u00e9es par le film de flux est acc\u00e9l\u00e9r\u00e9e, ce qui emp\u00eache tout contact direct avec l\u2019eau ext\u00e9rieure. Une autre fonction de la membrane de flux est d\u2019am\u00e9liorer l\u2019activit\u00e9 de surface des bulles, renfor\u00e7ant ainsi l\u2019effet d\u2019adsorption et d\u2019\u00e9limination des scories.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2797\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/07\/26.jpg\" alt=\"Affinage des d\u00e9chets d&#039;aluminium\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/26.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/26-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p><strong>Le traitement en ligne visant \u00e0 \u00e9liminer les impuret\u00e9s comprend principalement deux \u00e9tapes :<\/strong><\/p>\n<p>(1) \u00c9limination de l'hydrog\u00e8ne par la m\u00e9thode Alpur en ligne : lorsque la m\u00e9thode Alpur en ligne est utilis\u00e9e, le <a href=\"http:\/\/www.alalloycasting.com\/fr\/hydrogen-degassing\/\">unit\u00e9 de d\u00e9gazage en ligne<\/a>\u00a0est cuit au gaz naturel avant utilisation, de mani\u00e8re \u00e0 ce que la temp\u00e9rature de la paroi interne ne soit pas inf\u00e9rieure \u00e0 700 \u2103. La m\u00e9thode traditionnelle utilise de l\u2019azote de haute puret\u00e9. Cependant, en raison de la pr\u00e9sence d\u2019une certaine quantit\u00e9 de magn\u00e9sium (Mg) dans l\u2019alliage d\u2019aluminium, lors du traitement de la masse fondue, le Mg et l\u2019azote pr\u00e9sents dans l\u2019alliage sont soumis \u00e0 des temp\u00e9ratures \u00e9lev\u00e9es, ce qui provoque une r\u00e9action chimique g\u00e9n\u00e9rant du nitrure de magn\u00e9sium. Ce dernier produit des impuret\u00e9s et affecte la qualit\u00e9 du produit fini. C\u2019est pourquoi on utilise la m\u00e9thode Alpur en ligne pour \u00e9liminer l\u2019hydrog\u00e8ne, et l\u2019argon est utilis\u00e9 \u00e0 la place de l\u2019azote. Dans ce proc\u00e9d\u00e9, la pression de l\u2019argon doit \u00eatre comprise entre 550 kPa et 760 kPa, et sa puret\u00e9 doit \u00eatre sup\u00e9rieure \u00e0 99,99%. Gr\u00e2ce au puissant effet d\u2019agitation de la buse rotative, la surface de contact entre l\u2019argon et l\u2019aluminium liquide \u00e9lectrolytique est efficacement augment\u00e9e, ce qui am\u00e9liore les conditions cin\u00e9tiques du proc\u00e9d\u00e9 de purification par flottation. Parall\u00e8lement, en raison de la faible vitesse de remont\u00e9e des minuscules bulles dans le bain d\u2019aluminium fondu, celles-ci s\u2019\u00e9l\u00e8vent en spirale sous l\u2019effet combin\u00e9 de la force centrifuge et de la force de flottabilit\u00e9, prolongeant ainsi le temps de contact gaz-liquide et permettant d\u2019atteindre l\u2019objectif d\u2019\u00e9limination de l\u2019hydrog\u00e8ne du bain fondu.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2377\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/06\/4-1.jpg\" alt=\"Technologie de coul\u00e9e de lingots d&#039;aluminium\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/06\/4-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/06\/4-1-300x240.jpg 300w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/06\/4-1-125x100.jpg 125w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>(2) \u00c9limination des impuret\u00e9s en ligne : le <a href=\"http:\/\/www.alalloycasting.com\/fr\/cff-filter-box-for-aluminum-melt-purification\/\">Bo\u00eete CFF<\/a> Permet d'\u00e9liminer les impuret\u00e9s pr\u00e9sentes dans l'aluminium en fusion. Le bac CFF est utilis\u00e9 pour la filtration et la purification de l'aluminium en fusion, en association avec un filtre en mousse c\u00e9ramique. Il permet de filtrer les inclusions et les particules infimes pr\u00e9sentes dans l'aluminium en fusion. 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. Elle 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":"<p>Furnace refining refers to the refining process. The pretreatment of the aluminum liquid includes furnace refining and online purification. The results show that the temperature&hellip;<\/p>","protected":false},"author":1,"featured_media":3298,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[1775],"class_list":["post-3228","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-furnace-refining"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Furnace Refining | Aluminum Liquid Refining Process<\/title>\n<meta name=\"description\" content=\"Furnace refining refers to the refining process. 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