{"id":12279,"date":"2022-01-14T02:16:47","date_gmt":"2022-01-14T02:16:47","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=12279"},"modified":"2022-01-14T02:16:47","modified_gmt":"2022-01-14T02:16:47","slug":"molten-al-filtration","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/molten-al-filtration\/","title":{"rendered":"Filtration de l'aluminium fondu"},"content":{"rendered":"<p>L'efficacit\u00e9 de filtration de l'aluminium fondu d\u00e9pend de la taille des alv\u00e9oles du filtre en mousse c\u00e9ramique d'alumine. En contr\u00f4lant minutieusement la taille des alv\u00e9oles au sein du filtre, il est possible d'obtenir des performances de filtration plus r\u00e9guli\u00e8res. En r\u00e8gle g\u00e9n\u00e9rale, l'efficacit\u00e9 de r\u00e9tention augmente \u00e0 mesure que la taille des alv\u00e9oles et la vitesse du m\u00e9tal dans le filtre diminuent.<\/p>\n<p>Les d\u00e9chets d'aluminium contiennent g\u00e9n\u00e9ralement des concentrations \u00e9lev\u00e9es de diverses impuret\u00e9s. Par cons\u00e9quent, l\u2019aluminium fondu ou les alliages obtenus par refusion de ces d\u00e9chets d\u2019aluminium sont susceptibles de contenir diverses inclusions, notamment des inclusions non m\u00e9talliques. Ces inclusions non m\u00e9talliques sont des oxydes initialement pr\u00e9sents dans les d\u00e9chets d\u2019aluminium utilis\u00e9s comme mati\u00e8re premi\u00e8re fondue, des oxydes g\u00e9n\u00e9r\u00e9s par r\u00e9action avec les impuret\u00e9s qu\u2019ils contiennent, etc. Les d\u00e9chets d\u2019aluminium sont expos\u00e9s \u00e0 l\u2019oxyg\u00e8ne atmosph\u00e9rique pendant la refonte. Par rapport \u00e0 l\u2019utilisation de minerai d\u2019aluminium, le probl\u00e8me des inclusions d\u2019oxydes est plus grave lorsque des d\u00e9chets d\u2019aluminium sont utilis\u00e9s comme mati\u00e8re premi\u00e8re. Ces inclusions d\u2019oxydes sont notamment l\u2019alumine (Al\u2082O\u2083), le spinelle (MgAl\u2082O\u2084) et la magn\u00e9sie (MgO).<\/p>\n<p>Par cons\u00e9quent, lorsque l'on utilise des d\u00e9chets d'aluminium provenant d'un produit en alliage d'aluminium de ce type comme mati\u00e8re premi\u00e8re d'aluminium, en partie ou en totalit\u00e9, il est n\u00e9cessaire d'\u00e9liminer au moins les inclusions de l'aluminium fondu obtenu par fusion de cette mati\u00e8re premi\u00e8re. Ainsi, outre les \u00e9tapes d'affinage telles que <a href=\"http:\/\/www.alalloycasting.com\/fr\/degassing-molten-aluminum\/\">d\u00e9gazage de l'aluminium fondu<\/a> \u00c0 l'aide d'un flux, on met en \u0153uvre des \u00e9tapes visant \u00e0 \u00e9liminer les inclusions de l'aluminium fondu, telles que la m\u00e9thode de st\u00e9rilisation, la m\u00e9thode au gaz actif et la filtration de l'aluminium fondu.<\/p>\n<p>Selon la m\u00e9thode de d\u00e9cantation, l'aluminium fondu est laiss\u00e9 au repos. La densit\u00e9 des inclusions \u00e9tant diff\u00e9rente de celle de l'aluminium fondu, cet \u00e9tat de repos peut entra\u00eener la remont\u00e9e des inclusions \u00e0 la surface ou leur s\u00e9dimentation au fond du bain d'aluminium fondu. On parvient ainsi \u00e0 s\u00e9parer les inclusions de l\u2019aluminium fondu. Cependant, l\u2019efficacit\u00e9 de cette s\u00e9paration est extr\u00eamement faible. Cela s\u2019explique par le fait que 1) la diff\u00e9rence de densit\u00e9 entre chaque inclusion et l\u2019aluminium fondu n\u2019est pas suffisamment importante, et 2) la mouillabilit\u00e9 entre les deux est assez \u00e9lev\u00e9e. Par cons\u00e9quent, m\u00eame si le proc\u00e9d\u00e9 est men\u00e9 \u00e0 bien sur une longue p\u00e9riode, il subsiste un probl\u00e8me : une grande quantit\u00e9 d\u2019inclusions reste pr\u00e9sente dans l\u2019aluminium fondu.<\/p>\n<p>Selon la m\u00e9thode du gaz actif, un gaz inerte ou un gaz halog\u00e9n\u00e9 est introduit dans l'aluminium fondu afin de g\u00e9n\u00e9rer des bulles. Les inclusions adh\u00e8rent \u00e0 ces bulles et flottent avec elles dans le bain d'aluminium fondu, ce qui permet de les s\u00e9parer de celui-ci. Cette m\u00e9thode est particuli\u00e8rement avantageuse pour l'\u00e9limination de gaz tels que l'hydrog\u00e8ne. Cependant, les bulles qui remontent \u00e0 la surface provoquent de violentes ondulations \u00e0 la surface de l'aluminium fondu et agitent ainsi ce dernier. Cela pose un autre probl\u00e8me : le film d'oxyde d'aluminium form\u00e9 \u00e0 la surface de l'aluminium fondu risque d'\u00eatre m\u00e9lang\u00e9 \u00e0 celui-ci, ce qui entra\u00eene une augmentation de la quantit\u00e9 d'inclusions d'oxyde d'aluminium.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-12280\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2022\/01\/Molten-Al-Filtration.jpg\" alt=\"Filtration de l&#039;aluminium fondu\" width=\"600\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2022\/01\/Molten-Al-Filtration.jpg 600w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2022\/01\/Molten-Al-Filtration-300x200.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>Selon le proc\u00e9d\u00e9 de filtration de l\u2019aluminium fondu, celui-ci est fait passer \u00e0 travers un filtre r\u00e9fractaire afin d\u2019en \u00e9liminer les inclusions. Les particules d\u2019inclusions de grande taille peuvent ainsi \u00eatre \u00e9limin\u00e9es de l\u2019aluminium fondu. Il est toutefois difficile d\u2019\u00e9liminer les particules d\u2019inclusions de 100 \u03bcm ou moins, qui constituent la majorit\u00e9 des inclusions. Il est notamment difficile d\u2019\u00e9liminer les minuscules particules d\u2019inclusions d\u2019environ 10 \u00e0 25 \u03bcm, bien que cette \u00e9limination soit indispensable pour obtenir des alliages d\u2019aluminium de haute qualit\u00e9. Pour \u00e9liminer ces fines particules d\u2019inclusions, les filtres en mousse c\u00e9ramique peuvent r\u00e9pondre \u00e0 cette exigence.<\/p>\n<p>Les filtres en mousse c\u00e9ramique d'alumine constituent une m\u00e9thode simple, fiable et \u00e9conomique pour \u00e9liminer les inclusions. Nous proposons toute la gamme de porosit\u00e9s, de PPI 10 \u00e0 PPI 60 (PPI = pores par pouce). Il est \u00e9galement possible de r\u00e9aliser des filtres sur mesure.<\/p>","protected":false},"excerpt":{"rendered":"<p>Molten Al Filtration efficiency is related to alumina ceramic foam filter cell size. By carefully controlling cell size within the filter, a more consistent filtration&hellip;<\/p>","protected":false},"author":1,"featured_media":12280,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[433,13164],"class_list":["post-12279","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-alumina-ceramic-foam-filter","tag-molten-al-filtration"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Molten Al Filtration with Alumina Ceramic Foam Filter<\/title>\n<meta name=\"description\" content=\"Molten Al Filtration efficiency is related to alumina ceramic foam filter cell size. 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