{"id":3202,"date":"2020-07-30T13:30:21","date_gmt":"2020-07-30T13:30:21","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3202"},"modified":"2020-10-19T08:48:48","modified_gmt":"2020-10-19T08:48:48","slug":"degassing-and-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/degassing-and-refining\/","title":{"rendered":"D\u00e9gazage et raffinage"},"content":{"rendered":"<p>\u201cLe terme \u201d d\u00e9gazage \u201c d\u00e9signe g\u00e9n\u00e9ralement l'\u00e9limination des gaz pr\u00e9sents dans l'alliage, tandis que le terme \u201d affinage \u00bb d\u00e9signe l'\u00e9limination des inclusions pr\u00e9sentes dans l'alliage. L'objectif du d\u00e9gazage et de l'affinage est d'\u00e9liminer ou de r\u00e9duire autant que possible les inclusions d'oxydes et les gaz afin d'am\u00e9liorer le degr\u00e9 de purification du m\u00e9tal. C\u2019est pourquoi le d\u00e9gazage et l\u2019affinage sont souvent qualifi\u00e9s de traitements de purification.<\/p>\n<p>Compte tenu de la diversit\u00e9 des vari\u00e9t\u00e9s et des utilisations des alliages d'aluminium, la puret\u00e9 de la masse fondue est un crit\u00e8re essentiel. En r\u00e8gle g\u00e9n\u00e9rale, la teneur en hydrog\u00e8ne doit \u00eatre inf\u00e9rieure \u00e0 0,2 ml\/100 gal, mais pour les mat\u00e9riaux destin\u00e9s \u00e0 l'a\u00e9ronautique soumis \u00e0 des exigences particuli\u00e8res, elle doit \u00eatre inf\u00e9rieure \u00e0 0,1 ml\/100 gal. Il est difficile de fixer des exigences quantitatives concernant les inclusions non m\u00e9talliques, car celles-ci ne peuvent pas \u00eatre quantifi\u00e9es avec pr\u00e9cision.<\/p>\n<p>Il existe de nombreuses m\u00e9thodes de purification de l'aluminium et des alliages d'aluminium, qui peuvent \u00eatre class\u00e9es en deux cat\u00e9gories : la purification en four et la purification externe. \u00c0 l'heure actuelle, les agents d'affinage et la purification par filtre c\u00e9ramique sont largement utilis\u00e9s dans le monde entier. Certaines usines de transformation de l'aluminium de grande et moyenne taille ont \u00e9galement mis en place des \u00e9quipements de traitement en ligne, tels que les \u00e9quipements de d\u00e9gazage en ligne AdTech, afin d'am\u00e9liorer encore la qualit\u00e9 de la masse fondue.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5831\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/07\/Degassing-and-Refining.jpg\" alt=\"D\u00e9gazage et raffinage\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/Degassing-and-Refining.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/Degassing-and-Refining-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p><strong>Affinage au flux<\/strong><\/p>\n<p><a href=\"http:\/\/www.alalloycasting.com\/fr\/flux-refining-process\/\">Affinage par flux<\/a> Ce processus s'effectue principalement par adsorption et dissolution des inclusions d'oxyde dans le fondant. Les pr\u00e9parations de raffinage couramment utilis\u00e9es sont \u00e0 base de chlorure, auxquelles on ajoute des fluorures tels que le CaF\u2082, le Na\u2083AlF\u2086, etc., afin d'absorber et de dissoudre l'Al\u2082O\u2083, et d'obtenir ainsi un effet de purification maximal. Elles permettent d\u2019\u00e9liminer les inclusions d\u2019oxyde et certains gaz, mais pas compl\u00e8tement. Au cours du processus d\u2019affinage, la temp\u00e9rature de l\u2019aluminium fondu doit \u00eatre r\u00e9gl\u00e9e de mani\u00e8re \u00e0 \u00eatre sup\u00e9rieure de 20 \u00e0 30 \u00b0C \u00e0 la temp\u00e9rature de coul\u00e9e. Le fondant est r\u00e9parti \u00e0 la surface de l\u2019alliage d\u2019aluminium fondu. La densit\u00e9 du fondant utilis\u00e9 dans les alliages d\u2019aluminium \u00e9tant inf\u00e9rieure \u00e0 celle de l\u2019aluminium liquide, celui-ci flotte \u00e0 la surface de l\u2019aluminium. Apr\u00e8s agitation pendant 5 \u00e0 10 minutes, on laisse reposer pendant 5 \u00e0 10 minutes, puis on retire les scories de l\u2019alliage et on saupoudre l\u2019agent de recouvrement. Une fois l\u2019affinage termin\u00e9, l\u2019aluminium fondu peut \u00eatre coul\u00e9.<\/p>\n<p><strong>Unit\u00e9 de d\u00e9gazage<\/strong><\/p>\n<p>Le syst\u00e8me se compose de deux parties : <a href=\"http:\/\/www.alalloycasting.com\/fr\/degassing-unit\/\">unit\u00e9 de d\u00e9gazage<\/a> et l'unit\u00e9 de filtration. L'unit\u00e9 de filtration sert principalement \u00e0 filtrer les impuret\u00e9s pr\u00e9sentes dans l'aluminium fondu \u00e0 l'aide d'un filtre en mousse c\u00e9ramique.<\/p>\n<p>\u00c9quipement de d\u00e9gazage en ligne : le gaz inerte traverse le rotor de la buse pour former de petites bulles dispers\u00e9es. Parall\u00e8lement, tandis que le rotor brasse la masse fondue, les bulles se r\u00e9partissent uniform\u00e9ment dans l'ensemble de celle-ci, adsorbant l'hydrog\u00e8ne et les inclusions, ce qui permet de purifier les gaz d'\u00e9chappement et d'\u00e9liminer les scories.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5829\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/07\/Degassing-and-Refining-1.jpg\" alt=\"D\u00e9gazage et raffinage\" width=\"400\" height=\"500\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/Degassing-and-Refining-1.jpg 400w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/Degassing-and-Refining-1-240x300.jpg 240w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<p><strong>Purification par filtre en mousse c\u00e9ramique<\/strong><\/p>\n<p><a href=\"http:\/\/www.alalloycasting.com\/fr\/ceramic-foam-filter\/\">Filtre en mousse c\u00e9ramique<\/a> Il s'agit d'un nouveau type de mat\u00e9riau filtrant en c\u00e9ramique. En g\u00e9n\u00e9ral, on fabrique des plaques filtrantes d\u2019une \u00e9paisseur de 50 mm et d\u2019une longueur et d\u2019une largeur comprises entre 200 et 600 mm, dont la porosit\u00e9 atteint 0,8 \u00e0 0,9. Lorsque la plaque en mousse c\u00e9ramique filtre l\u2019aluminium fondu, les particules d\u2019inclusion sont retenues par la plaque filtrante en mousse c\u00e9ramique.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1992\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/05\/ceramic-foam-filter-3.jpg\" alt=\"Filtre en mousse c\u00e9ramique\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/05\/ceramic-foam-filter-3.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/05\/ceramic-foam-filter-3-300x240.jpg 300w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/05\/ceramic-foam-filter-3-125x100.jpg 125w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>La quantit\u00e9 totale et la puret\u00e9 de l'aluminium liquide n'ont aucune incidence sur l'efficacit\u00e9 de la filtration, mais influent uniquement sur la dur\u00e9e de vie de la plaque en c\u00e9ramique. D'une mani\u00e8re g\u00e9n\u00e9rale, plus la plaque en c\u00e9ramique est \u00e9paisse et plus ses alv\u00e9oles sont petites, plus le d\u00e9bit d'aluminium liquide \u00e0 travers la plaque est faible, et meilleure est l'efficacit\u00e9 de la filtration.<\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>&#8220;Degassing&#8221; generally refers to the removal of gases from the alloy, while &#8220;refining&#8221; refers to the removal of inclusions in the alloy. The purpose of&hellip;<\/p>","protected":false},"author":1,"featured_media":2902,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[1756,19,240],"class_list":["post-3202","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-degassing-and-refining","tag-degassing-unit","tag-flux-refining"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Degassing and Refining,Flux Refining,Degassing Unit<\/title>\n<meta name=\"description\" content=\"The purpose of degassing and refining is to remove or reduce oxide inclusions and gases as much as possible, improve the degree of metal.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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