{"id":10040,"date":"2021-08-24T07:47:57","date_gmt":"2021-08-24T07:47:57","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10040"},"modified":"2021-08-24T07:47:57","modified_gmt":"2021-08-24T07:47:57","slug":"metal-degassing-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/metal-degassing-refining\/","title":{"rendered":"D\u00e9gazage et affinage des m\u00e9taux"},"content":{"rendered":"

Les m\u00e9thodes courantes de raffinage rotatif par d\u00e9gazage des m\u00e9taux sont le raffinage par d\u00e9gazage et le raffinage par pulv\u00e9risation de poudre. Le principe consiste \u00e0 faire passer un gaz inerte ou un agent de raffinage au fond du four.<\/p>\n

Le agent de raffinage<\/a> est tr\u00e8s l\u00e9ger, et le gaz inerte ou l'agent d'affinage commence \u00e0 remonter depuis le fond du four ; l'hydrog\u00e8ne et les scories pr\u00e9sents dans l'aluminium en fusion sont ainsi \u00e9limin\u00e9s au cours de ce processus de remont\u00e9e, ce qui permet de purifier l'aluminium en fusion.<\/p>\n

Le unit\u00e9 de d\u00e9gazage<\/a> Utilis\u00e9e dans le processus de d\u00e9gazage du raffinage, elle entra\u00eene la plaque \u00e0 bride via le moteur, et cette derni\u00e8re est reli\u00e9e au rotor en graphite pour assurer sa rotation.<\/p>\n

L'effet d'affinage obtenu par pulv\u00e9risation rotative de poudre est meilleur, mais cela peut facilement entra\u00eener le colmatage du rotor en graphite. En production, on utilise souvent du gaz inerte sec ou de l'azote de haute puret\u00e9 pour l'affinage. Le gaz est raccord\u00e9 \u00e0 la bride ; celle-ci commence \u00e0 tourner sous l'action du moteur, le rotor en graphite tourne avec la bride \u00e0 une vitesse de 400 \u00e0 600 tr\/min, et le d\u00e9bit de gaz inerte (argon) est r\u00e9gl\u00e9 entre 15 et 25 L\/min, celui d\u2019azote entre 20 et 40 L\/min, \u00e0 une pression de (0,4 \u00b1 0,1) MPa.<\/p>\n

\"M\u00e9thode<\/p>\n

Fonctionnement des \u00e9quipements de d\u00e9gazage et d'affinage par rotation des m\u00e9taux<\/strong><\/p>\n

Commencez par ouvrir la vanne de gaz, puis abaissez lentement le d\u00e9gazeur jusqu\u2019\u00e0 ce que la distance entre le rotor en graphite du d\u00e9gazeur et le fond de la poche soit comprise entre 100 et 150 mm ; enfin, mettez le moteur en marche pour lancer le d\u00e9gazage et l\u2019affinage.<\/p>\n

La dur\u00e9e de raffinage est de 10 \u00e0 20 minutes. Afin d\u2019\u00e9viter le tourbillon provoqu\u00e9 par la rotation \u00e0 grande vitesse du rotor en graphite, une chicane est plac\u00e9e d\u2019un c\u00f4t\u00e9 ou des deux c\u00f4t\u00e9s du rotor en graphite pour r\u00e9duire la turbulence de l\u2019aluminium fondu pendant la rotation. Lors du d\u00e9gazage du rotor en graphite, cela garantit que les bulles sont petites, que leur dispersion est \u00e9lev\u00e9e et que l\u2019efficacit\u00e9 est optimale, ce qui permet d\u2019assurer l\u2019efficacit\u00e9 du d\u00e9gazage. Ainsi, les bulles ne brisent pas le film d\u2019oxyde de surface et ne provoquent pas d\u2019\u00e9bullition, ce qui \u00e9vite une r\u00e9inhalation.<\/p>\n

Une fois le d\u00e9gazage termin\u00e9, arr\u00eatez le moteur, soulevez le rotor en graphite pour l'\u00e9loigner de la surface du liquide, puis fermez la vanne de gaz.<\/p>","protected":false},"excerpt":{"rendered":"

The common methods of metal degassing rotary refining are degassing refining and powder spraying refining. The principle is to pass inert gas or refining agent…<\/p>","protected":false},"author":1,"featured_media":10041,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[12494,12495],"class_list":["post-10040","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-metal-degassing-refining","tag-rotating-degassing-equipment"],"yoast_head":"\nMetal Degassing Refining, Rotating Degassing Equipment<\/title>\n<meta name=\"description\" content=\"The common methods of metal degassing rotary refining are degassing refining and powder spraying refining. 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