{"id":10655,"date":"2021-10-18T08:58:54","date_gmt":"2021-10-18T08:58:54","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10655"},"modified":"2021-10-18T08:58:54","modified_gmt":"2021-10-18T08:58:54","slug":"online-refining-filtration","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/online-refining-filtration\/","title":{"rendered":"Raffinage et filtration en ligne"},"content":{"rendered":"

Apr\u00e8s l'affinage dans le four statique, il faut attendre 30 minutes : les bulles g\u00e9n\u00e9r\u00e9es par l'affinage dans la masse fondue transportent l'hydrog\u00e8ne qui s'y diffuse, tandis que les scories oxyd\u00e9es qui se sont fix\u00e9es \u00e0 la surface pendant la phase de remont\u00e9e des bulles d\u00e9bordent de la surface du liquide, ce qui correspond g\u00e9n\u00e9ralement aux exigences des produits de qualit\u00e9 inf\u00e9rieure. Lorsque l\u2019agent modificateur est ajout\u00e9 au cours du processus de fusion, on peut passer \u00e0 l\u2019\u00e9tape de coul\u00e9e. Cependant, pour les produits haut de gamme, un affinage en ligne et une filtration en ligne sont n\u00e9cessaires afin de purifier davantage le bain de fusion. Dans le m\u00eame temps, il est pr\u00e9f\u00e9rable d\u2019utiliser la m\u00e9thode de modification en ligne, de sorte que l\u2019agent modificateur soit ajout\u00e9 environ 15 minutes avant la coul\u00e9e, avant de passer \u00e0 l\u2019\u00e9tape de coul\u00e9e.<\/p>\n

Nous savons que le coulage et le laminage constituent un processus continu. Une fois mis en route, ce processus peut se poursuivre sans interruption pendant plusieurs jours, voire plus d\u2019une semaine. Cependant, le rendement de production du coulage et du laminage est faible. En g\u00e9n\u00e9ral, le d\u00e9bit de la masse d\u2019aluminium en fusion passant par le dispositif de d\u00e9gazage et de filtration en ligne est inf\u00e9rieur \u00e0 2 t par heure ; par cons\u00e9quent, la capacit\u00e9 du dispositif de traitement en ligne<\/a> pour la coul\u00e9e et le laminage ne doivent pas \u00eatre trop importantes.<\/p>\n

Si la capacit\u00e9 est trop importante, l'aluminium liquide reste dans la cuve d'affinage et le Bo\u00eetier de filtre CFF<\/a> depuis longtemps. D'une part, cela implique d'augmenter les investissements en \u00e9quipements, d'allonger la dur\u00e9e de traitement et de gaspiller des ressources et de l'\u00e9nergie ; d'autre part, cela affecte la qualit\u00e9 du produit, notamment lorsque le temps de s\u00e9jour de l'aluminium fondu dans le caisson de filtration d\u00e9passe la moiti\u00e9. Au-del\u00e0 de quelques heures, la teneur en air de l\u2019aluminium fondu apr\u00e8s filtration lors de l\u2019affinage en ligne a \u00e9t\u00e9 consid\u00e9rablement r\u00e9duite, mais la probabilit\u00e9 et la vitesse de r\u00e9action avec l\u2019atmosph\u00e8re ambiante ont augment\u00e9, entra\u00eenant une nouvelle hausse de la teneur en air. La pratique montre que si le temps de s\u00e9jour d\u00e9passe 40 min, la teneur en gaz de la masse fondue augmente d\u2019environ 0,01 m\/ (100 g Al).<\/p>\n

\"\"<\/p>\n

En ce qui concerne la coul\u00e9e, plus de 90% d\u2019alliage d\u2019aluminium sont coul\u00e9s selon le proc\u00e9d\u00e9 de coul\u00e9e verticale semi-continue. Capacit\u00e9 maximale par coul\u00e9e : la production de tubes, barres et profil\u00e9s de petite et moyenne taille est d\u2019environ 15 t. La production de tubes, barres et profil\u00e9s de grande taille est d\u2019environ 35.<\/p>\n

Par souci de simplicit\u00e9, prenons comme exemple un volume de coul\u00e9e de 15 tonnes par lot. La dur\u00e9e de coul\u00e9e d'un lot varie en fonction des diff\u00e9rentes s\u00e9ries d'alliages, des m\u00e9thodes de coul\u00e9e et du diam\u00e8tre des lingots.<\/p>\n

Pour les sp\u00e9cifications moyennes des alliages tendres, l'intervalle de cristallisation \u00e9tant \u00e9troit (g\u00e9n\u00e9ralement compris entre 40 et 70 \u00b0C), la dur\u00e9e d'une coul\u00e9e (longueur de coul\u00e9e : 6 \u00e0 8 m) est d'environ 1 \u00e0 1,5 h. L'intervalle de cristallisation de l'alliage dur 2024 est de 136 \u00b0C, tandis que celui de l'alliage 7075 atteint 158 \u00b0C ; l'intervalle de cristallisation augmente donc. Dans les m\u00eames conditions, la dur\u00e9e de coul\u00e9e s'en trouve naturellement prolong\u00e9e, pour atteindre environ 3 h.<\/p>","protected":false},"excerpt":{"rendered":"

After refining in the static furnace, wait for 30 minutes, the bubbles generated by the refining in the melt, carry the hydrogen that diffuses into…<\/p>","protected":false},"author":1,"featured_media":10656,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10655","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nOnline Refining Filtration with Degassing and CFF Filtering System<\/title>\n<meta name=\"description\" content=\"For high-end products, online refining filtration is required to further purify the melt. 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