{"id":4960,"date":"2020-09-19T08:43:02","date_gmt":"2020-09-19T08:43:02","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4960"},"modified":"2020-09-19T08:43:02","modified_gmt":"2020-09-19T08:43:02","slug":"purification-technology-of-aluminum","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/purification-technology-of-aluminum\/","title":{"rendered":"Technologie de purification de l'aluminium"},"content":{"rendered":"<p>Avec l'expansion continue de l'utilisation des alliages d'aluminium dans divers secteurs de l'\u00e9conomie nationale, des exigences de plus en plus strictes sont impos\u00e9es en mati\u00e8re de qualit\u00e9 interne de ces mat\u00e9riaux. Au cours du processus de production, la composition chimique de l\u2019alliage d\u2019aluminium ainsi que les d\u00e9fauts tels que les cavit\u00e9s de retrait, la porosit\u00e9 et les inclusions de scories dans les lingots doivent \u00eatre strictement contr\u00f4l\u00e9s. En effet, la qualit\u00e9 interne des produits transform\u00e9s d\u00e9pend de celle des lingots, et la qualit\u00e9 interne des lingots d\u00e9pend elle-m\u00eame en grande partie de la qualit\u00e9 de la masse fondue. Par cons\u00e9quent, la puret\u00e9 de la masse fondue d\u2019alliage d\u2019aluminium rev\u00eat une importance capitale. Compte tenu des \u00e9quipements et des conditions de processus existants, la technologie de purification de la masse fondue d\u2019aluminium est con\u00e7ue pour r\u00e9duire la teneur en hydrog\u00e8ne de celle-ci, afin d\u2019obtenir des lingots de haute qualit\u00e9.<\/p>\n<h2>Technologie de purification de l'aluminium<\/h2>\n<p>Le principal gaz pr\u00e9sent dans l'aluminium fondu est l'hydrog\u00e8ne (sa fraction volumique est 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'aluminium fondu comprennent principalement la m\u00e9thode de flottation par bulles, la m\u00e9thode de traitement sous vide, la m\u00e9thode de traitement par ultrasons et la m\u00e9thode de d\u00e9shydrog\u00e9nation par terres rares. La m\u00e9thode de flottation par 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 de l\u2019aluminium fondu par flottation \u00e0 bulles : les atomes d\u2019hydrog\u00e8ne dissous dans l\u2019aluminium fondu migrent vers la p\u00e9riph\u00e9rie de la bulle de l\u2019agent de purification (argon ou azote, etc.), s\u2019adsorbent autour de la bulle, se combinent en mol\u00e9cules d\u2019hydrog\u00e8ne pour p\u00e9n\u00e9trer dans la bulle, puis s\u2019\u00e9chappent finalement de l\u2019aluminium fondu lorsque la bulle remonte \u00e0 la surface. L\u2019\u00e9quation du taux de d\u00e9shydrog\u00e9nation refl\u00e8te l\u2019efficacit\u00e9 de la d\u00e9shydrog\u00e9nation du point de vue de la cin\u00e9tique de d\u00e9shydrog\u00e9nation.<\/p>\n<p>L'objectif de l'utilisation de <a href=\"http:\/\/www.alalloycasting.com\/fr\/online-degassing-device\/\">\u00e9quipement de d\u00e9gazage en ligne<\/a> vise \u00e0 purifier davantage l'aluminium fondu \u00e0 l'ext\u00e9rieur du four et \u00e0 \u00e9liminer plus efficacement les gaz et les scories pr\u00e9sents dans l'aluminium fondu (le principe repose sur l'\u00e9limination des scories par flottation et le d\u00e9gazage par bulles gr\u00e2ce \u00e0 une diff\u00e9rence de pression partielle). L'efficacit\u00e9 de d\u00e9gazage d'un dispositif de d\u00e9gazage en ligne d\u00e9pend de la capacit\u00e9 en aluminium liquide, du d\u00e9bit de gaz inerte, de la pression atmosph\u00e9rique, de la temp\u00e9rature du bain, de la vitesse de rotation du rotor, de l'efficacit\u00e9 de la turbine du rotor et de l'\u00e9tanch\u00e9it\u00e9 du bain de fusion. L'efficacit\u00e9 optimale de d\u00e9gazage est obtenue en optimisant le d\u00e9bit, la vitesse de rotation et la pression.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4962\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Purification-Technology-of-Aluminum-1.jpg\" alt=\"Technologie de purification de l&#039;aluminium\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Purification-Technology-of-Aluminum-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Purification-Technology-of-Aluminum-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>La pollution secondaire de l'aluminium fondu se produit principalement dans le canal d'\u00e9coulement de l'aluminium, entre l'orifice du four et le point de coul\u00e9e. Des dispositifs de d\u00e9gazage et de filtration en ligne sont install\u00e9s sur ce canal afin de purifier davantage l'aluminium fondu. Au cours de son passage dans le canal, l'aluminium fondu absorbe de l'hydrog\u00e8ne \u00e0 des degr\u00e9s divers lorsqu'il entre en contact avec l'humidit\u00e9 de l'air. Lorsque l'aluminium fondu entre en contact avec l'eau, une r\u00e9action chimique se produit : l'hydrog\u00e8ne atomique est absorb\u00e9 par la surface de l'aluminium liquide, puis se diffuse dans la masse fondue. L'ensemble du processus de dissolution repose sur l'adsorption physique, l'adsorption chimique et la diffusion.<\/p>\n<p>Dans la pratique, la pollution secondaire de la masse d'aluminium fondu doit \u00eatre bien ma\u00eetris\u00e9e d\u00e8s la sortie de <a href=\"http:\/\/www.alalloycasting.com\/fr\/degassing-unit\/\">unit\u00e9 de d\u00e9gazage<\/a> jusqu'au point de coul\u00e9e. La m\u00e9thode la plus efficace pour contr\u00f4ler ce ph\u00e9nom\u00e8ne consiste \u00e0 augmenter la vitesse d'\u00e9coulement de la masse fondue dans le canal d'\u00e9coulement et dans le caisson filtrant CFF, \u00e0 r\u00e9duire la surface de contact entre l'aluminium liquide et l'air, et \u00e0 diminuer le taux d'humidit\u00e9 de l'air. Pour le <a href=\"http:\/\/www.alalloycasting.com\/fr\/plate-filtering-unit\/\">Unit\u00e9 de filtration CFF<\/a>, il convient d'utiliser un caisson de filtration \u00e0 \u00e9tanch\u00e9it\u00e9 \u00e9lev\u00e9e et de r\u00e9duire le temps de s\u00e9jour de l'aluminium fondu dans ce caisson. En particulier lorsque la teneur en hydrog\u00e8ne de la masse fondue est faible, une \u00e9tanch\u00e9it\u00e9 d'autant plus \u00e9lev\u00e9e est requise ; sinon, l'efficacit\u00e9 du traitement de d\u00e9gazage en ligne sera r\u00e9duite par une pollution secondaire ult\u00e9rieure, et il ne sera pas possible d'obtenir une masse d'aluminium fondu de qualit\u00e9 optimale.<\/p>","protected":false},"excerpt":{"rendered":"<p>With the continuous expansion of the application of aluminum alloy materials in various fields of national economy, higher and higher requirements are put forward for&hellip;<\/p>","protected":false},"author":1,"featured_media":4961,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-4960","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO 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