bo\u00eete de d\u00e9gazage<\/a> consiste \u00e0 fragmenter le gaz inerte introduit en fines bulles \u00e0 l'aide d'un rotor tournant \u00e0 grande vitesse (vitesse de rotation d'environ 500 tr\/min). Selon les principes de la cin\u00e9tique, plus le temps de contact entre le gaz inerte et l'aluminium fondu est long et plus la surface de contact est grande, meilleur est l'effet de d\u00e9gazage. Il est donc n\u00e9cessaire de briser les bulles autant que possible.<\/p>\nGr\u00e2ce au principe de perm\u00e9ation et d'adsorption, l'hydrog\u00e8ne et les impuret\u00e9s pr\u00e9sents dans l'aluminium fondu sont \u00e0 nouveau purifi\u00e9s afin d'obtenir un effet d'\u00e9limination des scories et de d\u00e9gazage. Gr\u00e2ce \u00e0 des mesures de d\u00e9gazage et de purification en continu, la teneur en hydrog\u00e8ne de la masse fondue peut \u00eatre r\u00e9duite \u00e0 moins de 0,12 ml\/100 g d'Al, ce qui r\u00e9pond aux exigences de la production de feuilles d'aluminium \u00ab double z\u00e9ro \u00bb.<\/p>\n
Apr\u00e8s le d\u00e9capage et le d\u00e9gazage par diverses m\u00e9thodes d'affinage, il reste encore de petites inclusions de scories de 30 \u00b5m \u00e0 50 pm en suspension dans la solution. La plaque filtrante en mousse c\u00e9ramique situ\u00e9e dans le caisson de filtration retient m\u00e9caniquement les impuret\u00e9s et \u00e9limine davantage les scories pr\u00e9sentes dans la solution. Les plaques filtrantes en mousse c\u00e9ramique \u00e9tant peu co\u00fbteuses, faciles \u00e0 se procurer et \u00e0 remplacer, et offrant une grande surface de filtration, la plupart des fabricants utilisent d\u00e9sormais des plaques filtrantes en c\u00e9ramique \u00e0 deux \u00e9tages ; les mod\u00e8les 50 PPI et 60 PPI sont les plus performants. Il convient de noter que la jonction entre le filtre et le caisson de filtration doit \u00eatre \u00e9troitement obtur\u00e9e afin d\u2019emp\u00eacher l\u2019aluminium liquide de s\u2019\u00e9chapper par les c\u00f4t\u00e9s et de r\u00e9duire ainsi l\u2019efficacit\u00e9 de la filtration.<\/p>","protected":false},"excerpt":{"rendered":"
The purity of aluminum melt is one of the main factors that affect the pass rate of aluminum foil. The slag inclusions in the aluminum…<\/p>","protected":false},"author":1,"featured_media":11199,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[12807,12380],"class_list":["post-11197","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-online-degassing-purification-with-inert-gas","tag-rotary-degassing-box"],"yoast_head":"\n
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