{"id":4588,"date":"2020-09-09T01:24:32","date_gmt":"2020-09-09T01:24:32","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4588"},"modified":"2020-09-09T01:24:32","modified_gmt":"2020-09-09T01:24:32","slug":"online-refining-and-degassing-systems","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/online-refining-and-degassing-systems\/","title":{"rendered":"Syst\u00e8mes de raffinage et de d\u00e9gazage en ligne"},"content":{"rendered":"<p>De nombreux facteurs influent sur la qualit\u00e9 de l\u2019aluminium et de ses alliages. Parmi ceux-ci, la teneur en hydrog\u00e8ne, les inclusions et la concentration en m\u00e9taux alcalins de l\u2019aluminium fondu ont l\u2019impact le plus important sur la qualit\u00e9 des alliages d\u2019aluminium. \u00c0 l\u2019heure actuelle, les principaux fabricants nationaux et \u00e9trangers utilisent principalement des syst\u00e8mes de raffinage et de d\u00e9gazage en ligne pour le raffinage et la purification de l\u2019aluminium fondu. Les syst\u00e8mes de raffinage et de d\u00e9gazage en ligne sont pour la plupart de type \u00ab bo\u00eete \u00bb <a href=\"http:\/\/www.alalloycasting.com\/fr\/degassing-unit\/\">unit\u00e9s de d\u00e9gazage rotatives<\/a>. L'aluminium en fusion s'\u00e9coule dans la chambre de d\u00e9gazage et est utilis\u00e9 dans des mat\u00e9riaux r\u00e9fractaires. Le rev\u00eatement int\u00e9rieur reste en place, et le couvercle du four est \u00e9quip\u00e9 d'un dispositif de chauffage afin de maintenir l'aluminium en fusion \u00e0 l'\u00e9tat liquide. Parall\u00e8lement, un rotor de d\u00e9gazage est install\u00e9 dans le couvercle du four. Le gaz inerte est inject\u00e9 dans l\u2019aluminium fondu \u00e0 travers le rotor en rotation et traverse celui-ci \u00e0 grande vitesse. Le rotor en rotation le fragmente en d\u2019innombrables petites bulles, qui se diffusent et remontent dans l\u2019aluminium fondu, \u00e9liminant ainsi l\u2019hydrog\u00e8ne. Au cours de la remont\u00e9e des petites bulles, sous l\u2019effet de la tension superficielle, certaines impuret\u00e9s sont entra\u00een\u00e9es hors de l\u2019aluminium fondu vers la surface, formant une \u00e9cume qui permet d\u2019\u00e9liminer les impuret\u00e9s pr\u00e9sentes dans l\u2019aluminium fondu.<\/p>\n<p>Une fois l'alliage d'aluminium moul\u00e9 sous pression fondu et affin\u00e9, l'aluminium fondu prendra la place de l'aluminium sous-trait\u00e9 ; les param\u00e8tres \u00e0 prendre en compte sont le moment avant et apr\u00e8s l'ajout de l'agent d'affinage, le d\u00e9bit d\u2019azote lors du d\u00e9gazage rotatif, la vitesse du rotor en graphite, la dur\u00e9e du d\u00e9gazage, ainsi que le diam\u00e8tre du rotor en graphite pendant les phases de sous-traitance et de d\u00e9gazage. L\u2019influence de la hauteur sur la densit\u00e9 de l\u2019aluminium fondu est mesur\u00e9e et analys\u00e9e tout au long du processus de production.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4590\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Online-Refining-and-Degassing-Systems.jpg\" alt=\"Syst\u00e8mes de raffinage et de d\u00e9gazage en ligne\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Online-Refining-and-Degassing-Systems.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Online-Refining-and-Degassing-Systems-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>1. Apr\u00e8s le d\u00e9gazage, l'efficacit\u00e9 du d\u00e9gazage varie selon la position de l'aluminium en fusion dans la sous-cha\u00eene de production ; c'est pr\u00e8s du plateau tournant que le r\u00e9sultat est le moins satisfaisant.<\/p>\n<p>2. Le d\u00e9bit d'azote a une certaine incidence sur l'emplacement de formation des bulles : les bulles g\u00e9n\u00e9r\u00e9es par un d\u00e9bit \u00e9lev\u00e9 se propagent plus loin, mais provoquent des projections plus importantes de l'aluminium en fusion, ce qui peut entra\u00eener des risques pour la s\u00e9curit\u00e9 de la production.<\/p>\n<p>3. La vitesse de rotation a une grande influence sur l'efficacit\u00e9 du d\u00e9gazage de l'aluminium fondu. Une vitesse \u00e9lev\u00e9e permet une meilleure diffusion des gaz et emp\u00eache l'aluminium fondu de s'\u00e9taler.<\/p>\n<p>4. Le moment d\u2019ajout de l\u2019agent d\u2019affinage n\u2019a qu\u2019un effet limit\u00e9 sur le d\u00e9gazage par rotation et ne permet pas d\u2019atteindre l\u2019objectif d\u2019affinage \u00e0 l\u2019int\u00e9rieur de l\u2019aluminium fondu. Il permet toutefois de traiter l\u2019\u00e9cume pr\u00e9sente \u00e0 la surface de l\u2019aluminium fondu. Il est recommand\u00e9 d\u2019utiliser un agent de d\u00e9carburation pour traiter les scories d\u2019aluminium en surface. Selon le cahier des charges de l\u2019agent d\u2019affinage, sa temp\u00e9rature d\u2019utilisation est comprise entre 700 et 750 \u2103, tandis que celle de l\u2019agent de d\u00e9soxydation et de d\u00e9gazage est \u2265 680 \u2103. L\u2019utilisation de l\u2019agent d\u2019affinage n\u00e9cessite une temp\u00e9rature plus \u00e9lev\u00e9e de l\u2019aluminium fondu, ce qui n\u2019est pas facile \u00e0 contr\u00f4ler.<\/p>\n<p>5. La vitesse de rotation et le d\u00e9bit d'azote doivent \u00eatre utilis\u00e9s conjointement afin de garantir l'effet de d\u00e9gazage et d'\u00e9viter que l'aluminium fondu ne s'oxyde sous l'effet du brassage. Un d\u00e9bit de 15 L\/min \u00e0 400 tr\/min permet de r\u00e9pondre \u00e0 ces exigences.<\/p>\n<p>6. Au cours du processus de d\u00e9gazage, l'\u00e9tat de mouvement de l'aluminium fondu et la pr\u00e9sence \u00e9ventuelle de projections d'aluminium fondu ont une incidence sur le d\u00e9gazage et l'oxydation de l'aluminium fondu. Apr\u00e8s le d\u00e9gazage, les scories d'aluminium pr\u00e9sentes \u00e0 la surface de l'aluminium fondu ainsi que la densit\u00e9 de l'\u00e9chantillon permettent d'\u00e9valuer l'efficacit\u00e9 du d\u00e9gazage de l'aluminium fondu.<\/p>","protected":false},"excerpt":{"rendered":"<p>There are many factors that affect the quality of aluminum and its alloys. Among them, the hydrogen content, inclusions and alkali metal concentration of molten&hellip;<\/p>","protected":false},"author":1,"featured_media":4589,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4308,4309,4305,4311,4306,1762,4348,116,4310,4302,4351,4303,4312,1754,4350,4349,4347,1770,1767,4464,4313,1771,4304,4301,4307,834,1980,1772],"class_list":["post-4588","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-and-nitrogen","tag-aluminum-hydrogen","tag-deaerator","tag-deaerator-price","tag-degasser","tag-degassing-aluminum-casting","tag-degassing-aluminum-with-nitrogen","tag-degassing-in-casting","tag-degassing-meaning","tag-degassing-molten-aluminum","tag-degassing-molten-aluminum-with-nitrogen","tag-degassing-of-aluminium-alloys","tag-degassing-of-aluminum","tag-degassing-process-in-aluminium","tag-degassing-solutions-with-nitrogen","tag-degassing-with-liquid-nitrogen","tag-degassing-with-nitrogen","tag-how-to-degas-aluminum","tag-hydrogen-degassing","tag-in-line-degasser","tag-metal-degassing","tag-methods-of-degassing-in-foundry","tag-mobile-degassing-unit","tag-nitrogen-degassing-aluminum","tag-purification-of-aluminium","tag-rotary-degasser","tag-rotary-degassing-aluminum","tag-rotary-degassing-unit"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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