{"id":5331,"date":"2020-09-30T03:59:37","date_gmt":"2020-09-30T03:59:37","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5331"},"modified":"2020-09-30T03:59:37","modified_gmt":"2020-09-30T03:59:37","slug":"purification-treatment","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/purification-treatment\/","title":{"rendered":"Traitement d'\u00e9puration"},"content":{"rendered":"

La technologie de traitement de purification de l'aluminium fondu constitue la premi\u00e8re \u00e9tape cl\u00e9 qui d\u00e9termine les applications des mat\u00e9riaux en alliage d'aluminium. Elle d\u00e9termine si ces mat\u00e9riaux pr\u00e9sentent des d\u00e9fauts m\u00e9tallurgiques et s'ils sont capables de transmettre leurs propri\u00e9t\u00e9s de haute performance, et elle conditionne leur utilisation et leur d\u00e9veloppement dans divers domaines.<\/p>\n

Le proc\u00e9d\u00e9 de purification de l'alliage d'aluminium fondu de l'entreprise repose principalement sur l'utilisation d'un four affinage par flux<\/a> et les proc\u00e9d\u00e9s d'\u00e9limination statique des scories. L'\u00e9limination statique des scories repose sur la diff\u00e9rence de densit\u00e9 entre les oxydes non m\u00e9talliques et le bain d'alliage lui-m\u00eame. Au bout d'un certain temps, les oxydes non m\u00e9talliques et le bain d'alliage sont s\u00e9par\u00e9s afin de purifier l'aluminium fondu. Cet article a pour objectif de d\u00e9terminer, par le biais d'exp\u00e9riences, le temps de repos optimal de l'aluminium fondu.<\/p>\n

Le four d'essai est un four statique de 20 tonnes destin\u00e9 aux alliages d'aluminium. Ce four statique a pour fonction d'\u00e9liminer les scories, de stabiliser et d'ajuster avec pr\u00e9cision la composition du m\u00e9lange d'aluminium fondu provenant du four de fusion et du four \u00e0 d\u00e9chets d'aluminium, afin de purifier l'alliage d'aluminium liquide et de fournir un alliage d'aluminium liquide de haute qualit\u00e9 \u00e0 l'\u00e9tape suivante.<\/p>\n

L'aluminium en fusion provenant du four de fusion et du four \u00e0 d\u00e9chets d'aluminium p\u00e9n\u00e8tre dans le four statique par le canal de coul\u00e9e<\/a> selon les proportions indiqu\u00e9es, puis la temp\u00e9rature est augment\u00e9e. Lorsque la temp\u00e9rature atteint 740 \u00b0C ou plus, 20 kg d\u2019agent de nettoyage des scories sont ajout\u00e9s au pulv\u00e9risateur de poudre, puis cet agent est inject\u00e9 dans l\u2019alliage d\u2019aluminium \u00e0 l\u2019aide d\u2019azote. L'int\u00e9rieur du bain subit une op\u00e9ration de purification par fusion, et les scories sont \u00e9limin\u00e9es apr\u00e8s 15 minutes de pulv\u00e9risation. Une fois l'\u00e9limination des scories termin\u00e9e, on proc\u00e8de \u00e0 la mise au repos.<\/p>\n

\"Traitement<\/p>\n

La teneur en inclusions de scories de l'aluminium fondu est plus \u00e9lev\u00e9e juste apr\u00e8s l'\u00e9limination des scories dans le four de repos. \u00c0 mesure que le temps de repos s'allonge, la teneur en inclusions de scories de l'aluminium fondu diminue progressivement. Lorsque le temps de repos est de 15 minutes, la teneur en inclusions de scories de l'aluminium fondu atteint pratiquement son niveau le plus bas ; au-del\u00e0 de 15 minutes, cette teneur reste pratiquement stable, avec de faibles variations.<\/p>\n

\u00c0 mesure que le temps de repos augmente, le taux de d\u00e9fauts li\u00e9s aux inclusions de scories de l'alliage affiche une tendance \u00e0 la baisse. Ce taux atteint son maximum une fois l'\u00e9limination des scories du four \u00e0 repos termin\u00e9e. Au cours des 25 premi\u00e8res minutes, le taux de d\u00e9fauts a consid\u00e9rablement baiss\u00e9, puis s'est globalement stabilis\u00e9 \u00e0 0,051 TP3T.<\/p>\n

Lorsque le temps de repos est de 15 minutes, la teneur en inclusions de scories de l'aluminium fondu atteint g\u00e9n\u00e9ralement un niveau faible ; au-del\u00e0 de 15 minutes, cette teneur reste globalement stable. Lorsque le temps de repos d\u00e9passe 25 minutes, le taux de d\u00e9fauts reste globalement stable. Lorsque l'aluminium fondu repose pendant plus de 25 minutes, sa puret\u00e9 peut atteindre un meilleur niveau ; en d'autres termes, il est possible de laisser reposer l'aluminium fondu pendant au moins 25 minutes avant de le transf\u00e9rer vers la station suivante.<\/p>","protected":false},"excerpt":{"rendered":"

The purification treatment technology of aluminum melt is the first key process that determines the application of aluminum alloy materials. It determines whether aluminum alloy…<\/p>","protected":false},"author":1,"featured_media":5332,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5331","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nPurification Treatment Technology of Aluminum Melt<\/title>\n<meta name=\"description\" content=\"The purification treatment technology of aluminum melt is the first key process that determines the application of aluminum alloy materials.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/fr\/purification-treatment\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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