{"id":4794,"date":"2020-09-15T08:49:42","date_gmt":"2020-09-15T08:49:42","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4794"},"modified":"2020-09-15T08:49:42","modified_gmt":"2020-09-15T08:49:42","slug":"degassing-aluminum","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/degassing-aluminum\/","title":{"rendered":"D\u00e9gazage de l'aluminium"},"content":{"rendered":"<p>La m\u00e9thode de flottation est g\u00e9n\u00e9ralement utilis\u00e9e pour le d\u00e9gazage de l'aluminium. L'unit\u00e9 de d\u00e9gazage rotative en ligne d'AdTech utilise la m\u00e9thode de flottation pour \u00e9liminer l'hydrog\u00e8ne pr\u00e9sent dans l'aluminium fondu. Le principe consiste \u00e0 introduire un gaz contenant de l'hydrog\u00e8ne dans le liquide d'alliage d'aluminium afin de g\u00e9n\u00e9rer des bulles, puis \u00e0 utiliser ces bulles pour extraire l'hydrog\u00e8ne dissous du liquide d'alliage d'aluminium et le faire s'\u00e9chapper dans l'atmosph\u00e8re au cours du processus de flottation. Afin d'obtenir un meilleur <a href=\"http:\/\/www.alalloycasting.com\/fr\/degassing-refining\/\">d\u00e9gazage et raffinage<\/a> En effet, le tuyau en fer qui introduit le gaz doit \u00eatre enfonc\u00e9 aussi profond\u00e9ment que possible dans le bain de fusion, et son extr\u00e9mit\u00e9 inf\u00e9rieure doit se trouver \u00e0 une distance de 100 \u00e0 150 mm du fond du four, afin d\u2019allonger la course des bulles qui remontent \u00e0 la surface, et, dans le m\u00eame temps, pour \u00e9viter que les inclusions situ\u00e9es au fond de l\u2019aluminium fondu ne soient remu\u00e9es.<\/p>\n<p>Lors de l'injection du gaz, le tuyau en fer doit \u00eatre d\u00e9plac\u00e9 lentement et lat\u00e9ralement dans le bain d'alliage d'aluminium, de mani\u00e8re \u00e0 ce que des bulles traversent le bain de fusion. Il convient d\u2019utiliser une pression et une vitesse de ventilation plus faibles et adapt\u00e9es, car les bulles ainsi form\u00e9es sont plus petites, ce qui augmente leur surface sp\u00e9cifique ; de plus, leur petite taille ralentit leur remont\u00e9e, ce qui permet d\u2019\u00e9liminer davantage d\u2019inclusions et de gaz. Parall\u00e8lement, afin de garantir un bon effet d\u2019affinage, la temp\u00e9rature d\u2019affinage doit \u00eatre choisie de mani\u00e8re appropri\u00e9e. Si la temp\u00e9rature est trop \u00e9lev\u00e9e, les bulles g\u00e9n\u00e9r\u00e9es seront plus grosses et remonteront rapidement, ce qui r\u00e9duira l\u2019efficacit\u00e9 de l\u2019affinage. Lorsque la temp\u00e9rature est trop basse, la viscosit\u00e9 du liquide d\u2019alliage d\u2019aluminium est relativement \u00e9lev\u00e9e, ce qui ne favorise pas l\u2019\u00e9vacuation compl\u00e8te des gaz pr\u00e9sents dans le liquide d\u2019alliage d\u2019aluminium et r\u00e9duit l\u2019effet d\u2019affinage.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4799\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Degassing-Aluminum.jpg\" alt=\"D\u00e9gazage de l&#039;aluminium\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Degassing-Aluminum.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Degassing-Aluminum-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Le traitement par ultrasons du liquide d'alliage d'aluminium permet un d\u00e9gazage efficace. Le principe repose sur le fait que, lorsque des ondes vibratoires sont transmises au liquide d'alliage d'aluminium, un ph\u00e9nom\u00e8ne de \u201c cavitation \u201d se produit dans ce dernier, ce qui rompt la continuit\u00e9 de sa structure et g\u00e9n\u00e8re de nombreux trous microscopiques sous vide, qui se dissolvent dans l'alliage d'aluminium. L'hydrog\u00e8ne pr\u00e9sent dans le liquide s'\u00e9chappe rapidement dans ces cavit\u00e9s pour former un noyau de bulle, qui continue de grossir et s'\u00e9chappe du liquide d'alliage d'aluminium sous forme de bulles, ce qui permet d'obtenir un effet d'affinage.<\/p>","protected":false},"excerpt":{"rendered":"<p>The floatation method is usually used for degassing aluminum. AdTech online rotary degassing unit adopts the floatation method to remove hydrogen in molten aluminum. The&hellip;<\/p>","protected":false},"author":1,"featured_media":4798,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[397,118,154,1755,1474,1734,1756,116,1777,1466,324,4347,1707,1770,1767,4373,1771,4301,818,92,4371,1467,4372,1980,1769,1706,4370,1773,1772],"class_list":["post-4794","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminium-degassing-process","tag-aluminum-degassing-machine","tag-aluminum-degassing-process","tag-aluminum-degassing-treatment","tag-aluminum-liquid-degassing-equipment","tag-aluminum-melt-degassing-and-refining","tag-degassing-and-refining","tag-degassing-in-casting","tag-degassing-molten-aluminium","tag-degassing-process-in-aluminum-casting","tag-degassing-system","tag-degassing-with-nitrogen","tag-dual-rotor-online-degassing-unit","tag-how-to-degas-aluminum","tag-hydrogen-degassing","tag-inert-gas-refining","tag-methods-of-degassing-in-foundry","tag-nitrogen-degassing-aluminum","tag-on-line-purification-device","tag-online-degassing-device","tag-online-degassing-of-aluminum","tag-refining-and-degassing-in-aluminum-alloy","tag-refining-and-slagging-aluminum-alloy","tag-rotary-degassing-aluminum","tag-rotary-degassing-equipment","tag-rotary-degassing-machine","tag-rotary-degassing-machine-manufacturer","tag-rotary-degassing-method","tag-rotary-degassing-unit"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Degassing Aluminum by Online Rotary Degassing Unit<\/title>\n<meta name=\"description\" content=\"The floatation method is usually used for degassing aluminum. 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