{"id":5078,"date":"2020-09-25T06:13:29","date_gmt":"2020-09-25T06:13:29","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5078"},"modified":"2020-09-25T06:13:29","modified_gmt":"2020-09-25T06:13:29","slug":"online-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/online-refining\/","title":{"rendered":"Raffinage en ligne"},"content":{"rendered":"<p>Dans le cadre du moulage et du laminage de barres en alliage d'aluminium-magn\u00e9sium-silicium \u00e0 haute r\u00e9sistance, l'utilisation d'\u00e9quipements d'affinage en continu pour le d\u00e9gazage et la filtration \u00e0 l'aide de plaques filtrantes en c\u00e9ramique alv\u00e9ol\u00e9e est de plus en plus r\u00e9pandue.<\/p>\n<p>Le dispositif d'affinage en continu de l'aluminium fondu a \u00e9t\u00e9 invent\u00e9 pour la premi\u00e8re fois par la United Carbide Corporation en 1974. Son principe de fonctionnement consiste \u00e0 injecter un gaz inerte de haute puret\u00e9 dans l'aluminium liquide \u00e0 travers une buse \u00e0 rotor en graphite tournant \u00e0 grande vitesse, afin de former un grand nombre de bulles dispers\u00e9es. Le liquide est enti\u00e8rement mis en contact avec le gaz, l\u2019hydrog\u00e8ne pr\u00e9sent dans l\u2019aluminium fondu se diffuse dans les bulles, et l\u2019aluminium fondu est \u00e9vacu\u00e9 \u00e0 mesure que les bulles remontent \u00e0 la surface, ce qui permet de r\u00e9aliser le processus de d\u00e9gazage. Parall\u00e8lement, lorsque les petites bulles remontent, gr\u00e2ce au m\u00e9canisme d\u2019adsorption par tension superficielle, certaines petites inclusions peuvent \u00eatre adsorb\u00e9es, ce qui permet d\u2019\u00e9liminer les scories.<\/p>\n<p>Le dispositif de raffinage en ligne \u00e0 rotor en graphite rotatif et \u00e0 pulv\u00e9risation est utilis\u00e9 pour le d\u00e9gazage. Le rotor en graphite tournant \u00e0 grande vitesse sert \u00e0 fragmenter le gaz inerte inject\u00e9 dans l'aluminium en fusion en tr\u00e8s petites bulles, ce qui augmente consid\u00e9rablement la surface de contact entre les bulles de gaz inerte et l'aluminium en fusion, et am\u00e9liore l'efficacit\u00e9 du d\u00e9gazage. \u00c0 condition d'utiliser un gaz inerte de haute puret\u00e9, il permet de r\u00e9duire la teneur en hydrog\u00e8ne \u00e0 moins de 0,12 ml pour 100 g d'aluminium. Il s'agit actuellement d'un dispositif de d\u00e9gazage en ligne largement utilis\u00e9. La filtration en ligne de l\u2019aluminium fondu comprend principalement : la filtration sur tissu de verre, la filtration sur plaques en c\u00e9ramique alv\u00e9ol\u00e9e, la filtration tubulaire et la filtration en lit profond.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5121\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Online-Refining-1.jpg\" alt=\"Raffinage en ligne\" width=\"400\" height=\"500\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Online-Refining-1.jpg 400w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Online-Refining-1-240x300.jpg 240w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<p>La filtration de la fonte d'aluminium \u00e0 l'aide d'un tissu de verre rel\u00e8ve de la filtration grossi\u00e8re \u00e0 tamis plat, qui s\u00e9pare m\u00e9caniquement les inclusions grossi\u00e8res gr\u00e2ce \u00e0 l'action de barri\u00e8res, mais ne permet pas d'\u00e9liminer les inclusions fines. Cette technique a \u00e9t\u00e9 abandonn\u00e9e ou n'est plus utilis\u00e9e que comme filtration grossi\u00e8re primaire \u00e0 la sortie du four.<\/p>\n<p>\u00c0 l'heure actuelle, la m\u00e9thode la plus couramment utilis\u00e9e et la plus efficace pour filtrer et \u00e9liminer les impuret\u00e9s consiste \u00e0 utiliser <a href=\"http:\/\/www.alalloycasting.com\/fr\/foam-ceramic-filters\/\">filtre en c\u00e9ramique alv\u00e9ol\u00e9e<\/a> plaques. Le liquide d'aluminium s'\u00e9coule \u00e0 travers les alv\u00e9oles sinueuses de la c\u00e9ramique, et les particules d'inclusion contenues dans la plaque c\u00e9ramique sont pi\u00e9g\u00e9es dans celle-ci sous l'effet combin\u00e9 de trois m\u00e9canismes : le blocage, le d\u00e9p\u00f4t et l'adsorption. La surface interne des alv\u00e9oles et les interstices permettent ainsi de s\u00e9parer les particules d'inclusion du liquide d'aluminium.<\/p>\n<p>La plaque filtrante en mousse c\u00e9ramique est un produit standard, d'une \u00e9paisseur de 2 pouces (1 pouce = 0,0254 m), dont la longueur et la largeur sont identiques, et dont l'angle d'inclinaison lat\u00e9ral est de 17,5\u00b0. La longueur diagonale est g\u00e9n\u00e9ralement utilis\u00e9e pour d\u00e9finir les sp\u00e9cifications, et la porosit\u00e9 de la plaque filtrante est exprim\u00e9e en PPI. Plus le PPI est \u00e9lev\u00e9, plus les pores sont petits. La porosit\u00e9 de la plaque filtrante d\u00e9termine la pr\u00e9cision finale de la filtration. Plus le d\u00e9bit de l'aluminium liquide dans la plaque filtrante est lent, meilleur est l'effet de filtration.<\/p>","protected":false},"excerpt":{"rendered":"<p>In the process of casting and rolling of aluminum-magnesium-silicon high-strength aluminum alloy rods, the use of online refining equipment for degassing and foam ceramic filter&hellip;<\/p>","protected":false},"author":1,"featured_media":5122,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5078","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>Online Refining by Degassing Sysytem and CFF Filtering System<\/title>\n<meta name=\"description\" content=\"The use of online refining equipment for degassing and foam 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