{"id":10695,"date":"2021-10-21T05:43:40","date_gmt":"2021-10-21T05:43:40","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10695"},"modified":"2021-10-21T05:43:40","modified_gmt":"2021-10-21T05:43:40","slug":"aluminum-scrap-recycling","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminum-scrap-recycling\/","title":{"rendered":"Recyclage des d\u00e9chets d'aluminium"},"content":{"rendered":"<p>Les d\u00e9chets d'aluminium, tels que les canettes de boisson, sont envoy\u00e9s dans le four et fondus pour former un alliage, \u00e0 condition que la peinture de leur surface ext\u00e9rieure ait \u00e9t\u00e9 \u00e9limin\u00e9e. On ajuste ensuite leur composition pour obtenir un lingot d'alliage d'aluminium secondaire, qui peut \u00eatre r\u00e9utilis\u00e9 pour fabriquer de nouvelles canettes en aluminium.<\/p>\n<p>L'aluminium est largement utilis\u00e9 pour la fabrication des canettes de boissons, car il pr\u00e9sente une bonne plasticit\u00e9 et une faible densit\u00e9. Il permet donc de fabriquer des canettes de boissons qui r\u00e9duisent la consommation d'\u00e9nergie lors du transport, et sa recyclabilit\u00e9 offre d'importants avantages \u00e9conomiques.<\/p>\n<p>La m\u00e9thode de recyclage des d\u00e9chets d'aluminium varie en fonction de leur nature et comprend g\u00e9n\u00e9ralement quatre \u00e9tapes : le pr\u00e9traitement, la fusion, l'affinage et le m\u00e9lange des alliages.<\/p>\n<p>La phase de pr\u00e9traitement des d\u00e9chets contenant de l'aluminium avant la fusion comprend le tri, le d\u00e9montage, la d\u00e9coupe, la s\u00e9paration magn\u00e9tique, le conditionnement et le s\u00e9chage. Le pr\u00e9traitement a pour objectif d'\u00e9liminer les explosifs, les pi\u00e8ces en fer et l'humidit\u00e9, et de conf\u00e9rer aux d\u00e9chets une granulom\u00e9trie appropri\u00e9e.<\/p>\n<p>Le traitement des d\u00e9chets d'aluminium repose g\u00e9n\u00e9ralement sur un proc\u00e9d\u00e9 pyrom\u00e9tallurgique ; les d\u00e9chets d'aluminium pr\u00e9trait\u00e9s sont fondus dans un four afin de produire de l'aluminium secondaire et des alliages d'aluminium.<\/p>\n<p>L'alliage d'aluminium recycl\u00e9 contient davantage d'impuret\u00e9s m\u00e9talliques et non m\u00e9talliques, et doit donc faire l'objet d'un raffinage suppl\u00e9mentaire.<\/p>\n<p><strong>\u00c9limination des impuret\u00e9s non m\u00e9talliques<\/strong><\/p>\n<p>Lorsque la masse fondue d\u2019alliage d\u2019aluminium r\u00e9g\u00e9n\u00e9r\u00e9 refroidit, la solubilit\u00e9 du gaz diminue et l\u2019hydrog\u00e8ne initialement dissous dans la masse fondue se pr\u00e9cipite sous forme d\u2019une phase distincte, ce qui g\u00e9n\u00e8re des pores dans la pi\u00e8ce moul\u00e9e, r\u00e9duisant ainsi ses propri\u00e9t\u00e9s m\u00e9caniques. De plus, l\u2019alumine, impuret\u00e9 non m\u00e9tallique solide, se r\u00e9partit aux limites des grains, ce qui r\u00e9duit \u00e9galement les propri\u00e9t\u00e9s m\u00e9caniques de l\u2019alliage. Afin d\u2019am\u00e9liorer les performances de l\u2019alliage r\u00e9g\u00e9n\u00e9r\u00e9, il est n\u00e9cessaire d\u2019\u00e9liminer les impuret\u00e9s pr\u00e9sentes dans celui-ci. <a href=\"http:\/\/www.alalloycasting.com\/fr\/molten-aluminum-refining\/\">Affinage de l'aluminium fondu<\/a> Parmi ces m\u00e9thodes, on peut citer la filtration, l'affinage par ventilation, l'affinage au sel et l'affinage sous vide.<\/p>\n<p><strong>\u00c9limination des impuret\u00e9s m\u00e9talliques<\/strong><\/p>\n<p>Les d\u00e9chets d'aluminium contiennent souvent des impuret\u00e9s m\u00e9talliques dont la teneur d\u00e9passe les normes prescrites et qui doivent \u00eatre \u00e9limin\u00e9es. Les m\u00e9thodes d'\u00e9limination comprennent l'oxydation, la chloration, la nitruration, etc.<\/p>\n<p>\u00c9tant donn\u00e9 que certains composants de l'alliage sont perdus au cours du processus de fusion, il est n\u00e9cessaire, apr\u00e8s l'affinage, d'ajouter des \u00e9l\u00e9ments d'alliage \u00e0 l'alliage d'aluminium liquide afin que l'alliage d'aluminium fondu r\u00e9ponde aux exigences de la norme applicable au produit.<\/p>","protected":false},"excerpt":{"rendered":"<p>Aluminum scrap recycling such as beverage cans, as long as the color on the outer surface is removed, is sent into the furnace and melted&hellip;<\/p>","protected":false},"author":1,"featured_media":10696,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10695","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site 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