{"id":2715,"date":"2020-07-09T10:18:06","date_gmt":"2020-07-09T10:18:06","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=2715"},"modified":"2020-07-15T01:21:17","modified_gmt":"2020-07-15T01:21:17","slug":"liquid-aluminium-purification","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/liquid-aluminium-purification\/","title":{"rendered":"Purification de l'aluminium liquide"},"content":{"rendered":"

L'aluminium liquide extrait de la cellule d'\u00e9lectrolyse d'aluminium contient de nombreuses impuret\u00e9s, qui affectent non seulement les performances de coul\u00e9e et d'usinage de l'aluminium m\u00e9tallique, mais aussi la qualit\u00e9 du produit. Outre les impuret\u00e9s m\u00e9talliques qui accompagnent la pr\u00e9cipitation de l\u2019aluminium au cours du processus d\u2019\u00e9lectrolyse, on trouve des impuret\u00e9s solides non m\u00e9talliques (telles que des oxydes, des carbures, des nitrures, etc.) et des gaz dissous (tels que H\u2082, CO\u2082, CO, CH\u2084 et N\u2082, etc.). 100 g d\u2019aluminium liquide dissolvent environ 0,2 \u00e0 0,4 cm\u00b3 d\u2019hydrog\u00e8ne \u00e0 une temp\u00e9rature de 1 273 K. L\u2019hydrog\u00e8ne pr\u00e9sent dans l\u2019aluminium liquide se pr\u00e9sente sous deux formes : l\u2019hydrog\u00e8ne atomique et l\u2019hydrog\u00e8ne gazeux. Le premier est dissous dans l\u2019aluminium liquide, tandis que le second est g\u00e9n\u00e9ralement adsorb\u00e9 sur les particules d\u2019inclusions solides et doit \u00eatre \u00e9limin\u00e9 avant la coul\u00e9e du lingot. Lorsque l\u2019aluminium liquide d\u2019origine est directement coul\u00e9 en diff\u00e9rentes billettes, les exigences en mati\u00e8re de purification de l\u2019aluminium liquide sont plus strictes, car les pores et les inclusions de scories pr\u00e9sents dans la billette deviendront directement des d\u00e9fauts des produits finis.<\/p>\n

Purification de l'aluminium liquide<\/h2>\n

Les m\u00e9thodes de purification de l'aluminium liquide couramment utilis\u00e9es sont la purification par filtration et la purification par gaz, ou une combinaison des deux en continu. m\u00e9thode de purification<\/a> \u00e0 l'ext\u00e9rieur du four. Par ailleurs, il en existe qui utilisent purification du flux<\/a>.<\/p>\n

\"Technologie<\/p>\n

Proc\u00e9d\u00e9 de filtration et de purification : proc\u00e9d\u00e9 permettant de purifier l'aluminium liquide des inclusions non m\u00e9talliques \u00e0 l'aide de filtre en mousse c\u00e9ramique<\/a> mat\u00e9riau filtrant. Le mat\u00e9riau filtrant peut \u00eatre constitu\u00e9 de billes de corindon, de feuilles de c\u00e9ramique expans\u00e9e, de tubes en c\u00e9ramique microporeux, de couches de carbone et de filtres en soie de silicate fabriqu\u00e9s \u00e0 haute temp\u00e9rature.<\/p>\n

La m\u00e9thode de purification par gaz consiste \u00e0 faire passer des bulles de gaz inerte ou de gaz actif dans l'aluminium fondu afin de dissoudre les gaz en solution. On peut utiliser des gaz inertes tels que l'azote et l'argon, ainsi que des gaz actifs tels que le chlore, le t\u00e9trachlorure de carbone et l'hexachloro\u00e9thane. Lorsqu\u2019on utilise du chlore gazeux, les bulles de chlore forment des bulles de chlorure d\u2019aluminium dispers\u00e9es dans l\u2019aluminium liquide, pi\u00e9gent les inclusions solides en suspension adsorb\u00e9es par l\u2019hydrog\u00e8ne, puis remontent \u00e0 la surface de l\u2019aluminium liquide pour \u00eatre \u00e9limin\u00e9es. Parall\u00e8lement, les impuret\u00e9s m\u00e9talliques telles que le lithium, le potassium, le calcium, le sodium et le magn\u00e9sium contenues dans l\u2019aluminium liquide peuvent \u00eatre \u00e9limin\u00e9es gr\u00e2ce \u00e0 la chloration. Cependant, le chlore est corrosif et entra\u00eene des pertes d\u2019aluminium ainsi qu\u2019une pollution environnementale ; il est donc principalement utilis\u00e9 en association avec l\u2019azote. La teneur en chlore est g\u00e9n\u00e9ralement comprise entre 3% et 6% (fraction volumique). De plus, afin de r\u00e9duire la quantit\u00e9 de chlorure d\u2019aluminium rejet\u00e9e dans l\u2019atmosph\u00e8re, on peut recourir \u00e0 la m\u00e9thode consistant \u00e0 r\u00e9pandre un flux de chlorure \u00e0 la surface de l\u2019aluminium pour ramener la teneur en sodium de l\u2019aluminium \u00e0 moins de 0,001%. Ce liquide \u00e0 faible teneur en sodium peut \u00eatre utilis\u00e9 pour la production d\u2019alliages d\u2019aluminium-magn\u00e9sium destin\u00e9s \u00e0 la d\u00e9formation.<\/p>\n

Filtration et purification des gaz<\/h2>\n

Cette m\u00e9thode combine la purification en continu hors du four avec la filtration et la purification par gaz. L'aluminium liquide est introduit en continu dans le dispositif de purification, sous la protection d'une couche de flux, puis balay\u00e9 par de l'azote (ou un m\u00e9lange de gaz). Apr\u00e8s avoir travers\u00e9 la couche filtrante de billes de corindon, l'aluminium liquide purifi\u00e9 est \u00e9vacu\u00e9 par la sortie. L'avantage de cette m\u00e9thode r\u00e9side dans sa capacit\u00e9 \u00e0 purifier en continu l'aluminium liquide (200 \u00e0 600 kg par minute) ; l'azote ne pollue pas l'environnement et offre un meilleur effet de purification, tandis que le taux d'\u00e9limination de l'hydrog\u00e8ne peut atteindre 30%-40%.<\/p>\n

La m\u00e9thode de purification par fondant peut \u00eatre utilis\u00e9e dans une fonderie d\u2019aluminium \u00e0 petite \u00e9chelle ou un atelier pour l\u2019affinage \u00e0 l\u2019aide d\u2019un m\u00e9lange de gaz azote-chlore dans le four de fusion, ou pour l\u2019affinage \u00e0 l\u2019aide d\u2019un agent d\u2019affinage et d\u2019un fondant dans le four. Lors de la coul\u00e9e \u00e0 l\u2019ext\u00e9rieur, les inclusions sont \u00e9limin\u00e9es \u00e0 l\u2019aide d\u2019un tamis filtrant, ce qui donne \u00e9galement de tr\u00e8s bons r\u00e9sultats. Le fondant utilis\u00e9 est g\u00e9n\u00e9ralement un m\u00e9lange de nitrate de sodium et de graphite, qui exploite la d\u00e9composition thermique du nitrate de sodium et sa r\u00e9action avec l\u2019aluminium pour former des oxydes d\u2019azote ou de l\u2019azote gazeux, afin d\u2019\u00e9liminer les impuret\u00e9s gazeuses.<\/p>","protected":false},"excerpt":{"rendered":"

The aluminum liquid removed from the aluminum electrolytic cell contains many impurities, which not only affects the casting and processing performance of metal aluminum, but…<\/p>","protected":false},"author":1,"featured_media":2821,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[823,19,822],"class_list":["post-2715","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-cff-filterer-box","tag-degassing-unit","tag-liquid-aluminium-purification"],"yoast_head":"\nLiquid Aluminium Purification,CFF Filterer Box,Degassing Unit<\/title>\n<meta name=\"description\" content=\"Liquid Aluminium Purification: The method of combining the continuous purification method outside the furnace with filtration and gas purification.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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