{"id":6568,"date":"2020-11-19T09:18:07","date_gmt":"2020-11-19T09:18:07","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6568"},"modified":"2020-11-19T09:18:07","modified_gmt":"2020-11-19T09:18:07","slug":"on-line-degassing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/on-line-degassing\/","title":{"rendered":"D\u00e9gazage en ligne"},"content":{"rendered":"

\u00c0 l'heure actuelle, les fonctions principales du d\u00e9gazage en ligne sont le d\u00e9gazage, l'\u00e9limination des scories et l'\u00e9limination des alcalis. De plus, ce proc\u00e9d\u00e9 permet \u00e9galement d'ajuster le bilan thermique de l'aluminium fondu dans la goulotte.<\/p>\n

Le d\u00e9gazage en ligne utilise g\u00e9n\u00e9ralement de l'azote ou de l'argon comme gaz vecteur ; il est \u00e9galement possible d'ajouter du chlore gazeux 2-5% au gaz vecteur afin d'am\u00e9liorer l'efficacit\u00e9 du d\u00e9gazage et de l'\u00e9limination des alcalis.
\nLe principe du d\u00e9gazage en ligne est conforme au principe de base du raffinage et du d\u00e9gazage en four. Le d\u00e9gazage s'effectue toujours par diff\u00e9rence de pression partielle et par r\u00e9action chimique.<\/p>\n

Cependant, contrairement au raffinage en four, la turbine \u00e0 rotor en graphite \u00e0 grande vitesse de l'\u00e9quipement de d\u00e9gazage en ligne permet de fragmenter les bulles en de nombreuses petites bulles dispers\u00e9es. Ces petites bulles seront r\u00e9parties de mani\u00e8re plus homog\u00e8ne dans l'espace restreint de la cuve de d\u00e9gazage, ce qui augmente consid\u00e9rablement la surface sp\u00e9cifique des bulles et am\u00e9liore de mani\u00e8re significative l'effet de d\u00e9gazage par diff\u00e9rence de pression partielle.<\/p>\n

Si l'on ajoute du chlore au gaz vecteur, le d\u00e9gazage sera plus efficace et l'\u00e9limination des alcalis sera consid\u00e9rablement am\u00e9lior\u00e9e. Le chlore gazeux est hautement toxique et pr\u00e9sente des risques potentiels pour la s\u00e9curit\u00e9, ce qui n\u00e9cessite une gestion et une utilisation rigoureuses.<\/p>\n

Diff\u00e9rent m\u00e9thodes de d\u00e9gazage en ligne<\/a> ont des effets de d\u00e9gazage diff\u00e9rents. \u00c0 l'heure actuelle, le d\u00e9gazage en caisson et le d\u00e9gazage en goulotte sont couramment utilis\u00e9s. Parmi celles-ci, le d\u00e9gazage en caisson est la m\u00e9thode la plus r\u00e9pandue ; il offre un fonctionnement stable et une efficacit\u00e9 de d\u00e9gazage \u00e9lev\u00e9e (le rendement sp\u00e9cifique de d\u00e9gazage d\u00e9pend de la conception du caisson de d\u00e9gazage et de la teneur initiale en hydrog\u00e8ne, g\u00e9n\u00e9ralement comprise entre 35 et 70%), mais l'investissement initial et les co\u00fbts d'exploitation sont relativement \u00e9lev\u00e9s.<\/p>\n

\"D\u00e9gazage<\/p>\n

L'\u00e9limination des scories lors de l'\u00e9tape de d\u00e9gazage en continu se fait uniquement par adsorption. Les fines scories sont adsorb\u00e9es sur les bulles et remontent \u00e0 la surface de l'aluminium fondu. Il est donc n\u00e9cessaire de nettoyer r\u00e9guli\u00e8rement les scories d'aluminium pr\u00e9sentes dans la cuve de d\u00e9gazage.<\/p>\n

L'\u00e9limination des alcalis lors du d\u00e9gazage en ligne s'effectue principalement par l'ajout de chlore gazeux au gaz vecteur. L'argon pur n'a aucun effet d'\u00e9limination des alcalis, tandis que l'azote a un effet d'\u00e9limination plus faible sur les m\u00e9taux alcalins pris individuellement.<\/p>\n

La cuve de d\u00e9gazage de type caisson est \u00e9quip\u00e9e d'un thermoplongeur qui permet de pr\u00e9chauffer l'aluminium fondu avant son introduction dans la cuve, afin d'augmenter sa temp\u00e9rature et d'\u00e9viter les risques li\u00e9s \u00e0 la s\u00e9curit\u00e9 et \u00e0 la qualit\u00e9 caus\u00e9s par la basse temp\u00e9rature de l'aluminium fondu au d\u00e9but du processus de coul\u00e9e. Au cours du processus de production, la temp\u00e9rature de l'aluminium fondu peut \u00e9galement \u00eatre ajust\u00e9e en activant et en d\u00e9sactivant le thermoplongeur de la cuve de d\u00e9gazage, afin de maintenir la stabilit\u00e9 de la temp\u00e9rature de l'aluminium fondu pendant le processus de coul\u00e9e.<\/p>","protected":false},"excerpt":{"rendered":"

At present, the basic functions of on line degassing are degassing, slag removal, and alkali removal. In addition, it also has the function of adjusting…<\/p>","protected":false},"author":1,"featured_media":6588,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6568","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nOn line Degassing Molten Aluminum by Degassing Unit<\/title>\n<meta name=\"description\" content=\"The basic functions of on line degassing are degassing, slag removal. 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