{"id":5337,"date":"2020-09-30T06:19:57","date_gmt":"2020-09-30T06:19:57","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5337"},"modified":"2020-09-30T06:19:57","modified_gmt":"2020-09-30T06:19:57","slug":"purification-technology","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/purification-technology\/","title":{"rendered":"Technologie de purification"},"content":{"rendered":"

Avec l'expansion continue des alliages d'aluminium dans divers secteurs de l'\u00e9conomie nationale, des exigences de plus en plus strictes sont impos\u00e9es quant \u00e0 la qualit\u00e9 intrins\u00e8que de ces mat\u00e9riaux. Au cours du processus de production, il est n\u00e9cessaire de contr\u00f4ler rigoureusement la composition chimique de l\u2019alliage d\u2019aluminium ainsi que les d\u00e9fauts tels que le retrait, la porosit\u00e9 et les inclusions de scories dans le lingot, car la qualit\u00e9 intrins\u00e8que des produits transform\u00e9s est influenc\u00e9e par celle du lingot, et la qualit\u00e9 interne de ce dernier d\u00e9pend en grande partie de celle de la masse fondue. Par cons\u00e9quent, la technologie de purification de la masse fondue d\u2019alliage d\u2019aluminium rev\u00eat une grande importance. En fonction des \u00e9quipements et des conditions de proc\u00e9d\u00e9 existants, il convient d\u2019\u00e9tudier la m\u00e9thode de contr\u00f4le de la teneur en hydrog\u00e8ne de la masse fondue d\u2019aluminium et de r\u00e9duire cette teneur, afin d\u2019obtenir des lingots de haute qualit\u00e9.<\/p>\n

Technologie de purification de l'aluminium<\/h2>\n

Le gaz pr\u00e9sent dans la masse d'aluminium fondu est principalement constitu\u00e9 d'hydrog\u00e8ne (fraction volumique comprise entre environ 60% et 90%), suivi de l'azote, de l'oxyg\u00e8ne, du monoxyde de carbone, etc. Les techniques de purification de l\u2019aluminium fondu destin\u00e9es principalement \u00e0 l\u2019\u00e9limination de l\u2019hydrog\u00e8ne comprennent notamment la m\u00e9thode de flottation \u00e0 bulles, le traitement sous vide, le traitement par ultrasons et la m\u00e9thode d\u2019\u00e9limination de l\u2019hydrog\u00e8ne par terres rares, etc. La m\u00e9thode de flottation \u00e0 bulles est largement utilis\u00e9e en raison de sa simplicit\u00e9 et de sa grande efficacit\u00e9. Processus d\u2019\u00e9limination de l\u2019hydrog\u00e8ne par flottation \u00e0 bulles de l\u2019aluminium fondu : les atomes d\u2019hydrog\u00e8ne dissous dans l\u2019aluminium liquide migrent vers la p\u00e9riph\u00e9rie des bulles de l\u2019agent de purification (argon ou azote, etc.), sont adsorb\u00e9s autour des bulles et forment des mol\u00e9cules d\u2019hydrog\u00e8ne \u00e0 l\u2019int\u00e9rieur de celles-ci. Enfin, l\u2019aluminium fondu s\u2019\u00e9chappe \u00e0 mesure que les bulles remontent \u00e0 la surface.<\/p>\n

\"Technologie<\/p>\n

\u00c9quipements principaux : four de fusion, dispositif d'agitation \u00e9lectromagn\u00e9tique, dispositif de d\u00e9gazage en continu, dispositif de filtration en continu, syst\u00e8me de glissi\u00e8res<\/a>. L'aluminium primaire \u00e9lectrolytique et les mati\u00e8res premi\u00e8res sont fondus et affin\u00e9s dans un four de fusion afin d'obtenir une masse d'aluminium fondu conforme aux exigences de temp\u00e9rature et de composition, puis laiss\u00e9s au repos pour subir un traitement. La masse d'aluminium fondu au repos est ensuite purifi\u00e9e davantage, puis coul\u00e9e apr\u00e8s avoir subi un d\u00e9gazage et une filtration en continu \u00e0 travers des canaux de coul\u00e9e.<\/p>\n

La solubilit\u00e9 de l'aluminium lorsqu'il est chauff\u00e9 \u00e0 300 \u00b0C \u00e0 l'air libre n'est que de 0,001 ml\/(100 g\u00b7Al), et l'aluminium solide n'absorbe pratiquement pas d'hydrog\u00e8ne. Lorsque l'aluminium fondu p\u00e9n\u00e8tre dans le syst\u00e8me de coul\u00e9e, sa teneur en hydrog\u00e8ne reste pratiquement inchang\u00e9e. Outre les mati\u00e8res premi\u00e8res, la source d'hydrog\u00e8ne de la masse fondue provient principalement de l'absorption d'hydrog\u00e8ne au cours des processus de fusion et de coul\u00e9e. L'objectif de l'utilisation d'un syst\u00e8me de mesure en ligne \u00e9quipement de d\u00e9gazage<\/a> est de purifier davantage l'aluminium en fusion \u00e0 l'ext\u00e9rieur du four et d'\u00e9liminer plus efficacement les gaz et les scories pr\u00e9sents dans l'aluminium en fusion.<\/p>","protected":false},"excerpt":{"rendered":"

With the continuous expansion of aluminum alloy materials in various fields of the national economy, higher and higher requirements are put forward for the internal…<\/p>","protected":false},"author":1,"featured_media":5338,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5337","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nPurification Technology for Molten Aluminum | Degassing Equipment<\/title>\n<meta name=\"description\" content=\"Purification technology of the aluminum alloy melt is very important. 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