{"id":6559,"date":"2020-11-19T09:36:57","date_gmt":"2020-11-19T09:36:57","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6559"},"modified":"2020-11-19T09:36:57","modified_gmt":"2020-11-19T09:36:57","slug":"molten-aluminum-degassing-device","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/molten-aluminum-degassing-device\/","title":{"rendered":"Dispositif de d\u00e9gazage de l'aluminium fondu"},"content":{"rendered":"

Le dispositif de d\u00e9gazage de l'aluminium fondu est l'\u00e9quipement cl\u00e9 pour la purification de l'aluminium fondu. D'une mani\u00e8re g\u00e9n\u00e9rale, il s'agit d'une \u00e9tape essentielle dans l'am\u00e9lioration de la qualit\u00e9 de l'aluminium. \u00c0 l'heure actuelle, la voie menant aux mat\u00e9riaux haut de gamme suit g\u00e9n\u00e9ralement plusieurs axes fondamentaux, \u00e0 savoir :
\nPlus grand et plus apte \u00e0 supporter la charge ;
\nPlus petit et plus pr\u00e9cis
\nPlus pur et plus propre ;
\nMieux que la performance ;
\nL'aluminium fondu dispositif de d\u00e9gazage<\/a> Il s'agit d'un \u00e9quipement essentiel qui permet \u00e0 l'alliage d'aluminium de s'\u00e9couler dans les quatre directions mentionn\u00e9es ci-dessus.
\nBien que ce dispositif soit appel\u00e9 \u00ab dispositif de d\u00e9gazage \u00bb, il remplit en r\u00e9alit\u00e9 deux fonctions classiques, \u00e0 savoir le d\u00e9gazage et la formation de scories, et permet \u00e9galement d'\u00e9liminer les alcalis apr\u00e8s modification de la composition du mat\u00e9riau raffin\u00e9.
\nJe vais commencer par parler des fonctions classiques.
\nLe d\u00e9gazage repose sur un principe similaire \u00e0 celui du d\u00e9gazage en four : dans des conditions normales, la diff\u00e9rence de pression partielle entre l'int\u00e9rieur et l'ext\u00e9rieur de la bulle form\u00e9e est utilis\u00e9e pour attirer l'hydrog\u00e8ne pr\u00e9sent dans la masse fondue vers la bulle et l'extraire ainsi de la masse fondue. Ces bulles sont g\u00e9n\u00e9ralement constitu\u00e9es de N\u2082 ou d'Ar. \u00c0 partir des m\u00eames agents d'affinage (tels que N\u2082, Ar, Cl\u2082, CCl\u2084, flux, etc.), l'efficacit\u00e9 du dispositif de d\u00e9gazage est nettement sup\u00e9rieure \u00e0 celle de l'affinage en four, car leur fonctionnement est diff\u00e9rent.<\/p>\n

Les fours contiennent g\u00e9n\u00e9ralement des dizaines de tonnes d'aluminium, et l'effet de diffusion des bulles lors de l'affinage est difficile \u00e0 ma\u00eetriser dans tous les recoins ; le dispositif de d\u00e9gazage constitue un point de contr\u00f4le sur le parcours que doit emprunter la masse fondue, et toute la masse fondue qui le traverse doit \u00eatre trait\u00e9e.<\/p>\n

\"Dispositif<\/p>\n

Un dispositif de d\u00e9gazage (appel\u00e9 ACD) est \u00e9galement install\u00e9 sur la goulotte. Plusieurs rotors sont r\u00e9partis dans le sens d'\u00e9coulement de la masse fondue. La substance raffin\u00e9e se diffuse dans la masse fondue \u00e0 travers le rotor, o\u00f9 elle intercepte les couches d'hydrog\u00e8ne pr\u00e9sentes dans la masse fondue et proc\u00e8de au d\u00e9gazage. On consid\u00e8re que ce proc\u00e9d\u00e9 donne de bons r\u00e9sultats, mais en g\u00e9n\u00e9ral, le d\u00e9gazage de type \u00ab bo\u00eete \u00bb, gr\u00e2ce \u00e0 la conception de sa chambre interne, permet un meilleur contr\u00f4le du trajet de la masse fondue et \u00e9vite \u00e9galement les effets n\u00e9fastes de la baisse de temp\u00e9rature de l\u2019aluminium fondu pendant la phase de d\u00e9marrage de la coul\u00e9e ; l\u2019effet de d\u00e9gazage est ainsi plus stable et plus fiable.<\/p>\n

Le principe de la formation de scories et du d\u00e9gazage dans le four est le m\u00eame. L'effet de dispersion \u00e9tant meilleur, l'adsorption et l'\u00e9limination des scories s'en trouvent am\u00e9lior\u00e9es. Cependant, le dispositif de d\u00e9gazage n\u2019est pas le principal moyen utilis\u00e9 pour \u00e9liminer les scories. Si la masse fondue dans le four n\u2019est pas trait\u00e9e correctement, la charge exerc\u00e9e sur la chambre de d\u00e9gazage augmentera, ce qui am\u00e9liorera certes l\u2019efficacit\u00e9 de l\u2019\u00e9limination des scories, mais la qualit\u00e9 globale de la masse fondue s\u2019en trouvera r\u00e9duite et le rotor s\u2019usera. Acc\u00e9l\u00e9rer le processus n\u2019est pas propice \u00e0 la qualit\u00e9 ni \u00e0 l\u2019efficacit\u00e9.<\/p>","protected":false},"excerpt":{"rendered":"

The molten aluminum degassing device is the key equipment for the purification of aluminum melt. In a great sense, it is a step in the…<\/p>","protected":false},"author":1,"featured_media":6599,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[],"class_list":["post-6559","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo"],"yoast_head":"\nMolten Aluminum Degassing Device -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"The molten aluminum degassing device is the key equipment for the aluminum purification. 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