{"id":10548,"date":"2021-10-12T09:07:07","date_gmt":"2021-10-12T09:07:07","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10548"},"modified":"2021-10-12T09:07:07","modified_gmt":"2021-10-12T09:07:07","slug":"melting-furnace-refining-flux","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/melting-furnace-refining-flux\/","title":{"rendered":"Four de fusion - Flux d'affinage"},"content":{"rendered":"<p>Le flux d'affinage utilis\u00e9 dans le four de fusion \u00e9limine les inclusions non m\u00e9talliques ; le laitier sec, semblable \u00e0 des cendres, ainsi produit se s\u00e9pare facilement du m\u00e9tal liquide. Cela facilite donc l'\u00e9cumage du laitier et r\u00e9duit la perte de m\u00e9tal due \u00e0 la pr\u00e9sence d'aluminium dans l'\u00e9cume. L'affinage de l'aluminium fondu a \u00e9t\u00e9 sp\u00e9cialement mis au point dans un souci de protection de l'environnement.<\/p>\n<p>Le flux de raffinage pour four de fusion ne d\u00e9gage pas de poussi\u00e8re et produit peu de fum\u00e9e lors de son utilisation. Par rapport au flux en poudre, <a href=\"http:\/\/www.alalloycasting.com\/fr\/granular-flux\/\">flux granulaire<\/a> peut \u00eatre utilis\u00e9 en quantit\u00e9 r\u00e9duite.<\/p>\n<p>Une fine couche d'alumine se forme \u00e0 la surface des copeaux d'aluminium. Cette couche se d\u00e9veloppe plus rapidement lorsque les d\u00e9chets sont expos\u00e9s \u00e0 des temp\u00e9ratures plus \u00e9lev\u00e9es et fondent. De plus, l'alumine finit par remonter \u00e0 la surface et former une phase d'\u00e9cume. La tension superficielle de la couche d'oxyde entra\u00eene le pi\u00e9geage de l'aluminium dans cette phase d'\u00e9cume. Ce ph\u00e9nom\u00e8ne est tr\u00e8s ind\u00e9sirable, car la teneur en m\u00e9tal de l'\u00e9cume peut atteindre jusqu'\u00e0 80%.<\/p>\n<p>Il est donc n\u00e9cessaire d'utiliser un agent d'affinage en four pour r\u00e9cup\u00e9rer l'aluminium contenu dans les scories en d\u00e9truisant la couche d'oxyde et en lib\u00e9rant le m\u00e9tal entra\u00een\u00e9. Cela s'obtient en modifiant la forme des gouttelettes d'aluminium, ce qui entra\u00eene la fissuration de la couche d'oxyde. Ces types de fondants sont bas\u00e9s sur une composition standard de 50 % en poids de NaCl et 50 % en poids de KCl, et leur temp\u00e9rature eutectique est d\u2019environ 660 \u00b0C. L\u2019ajout de sel fluor\u00e9 contribue \u00e0 favoriser la coalescence et \u00e0 produire un fondant dont la teneur en m\u00e9tal est nettement inf\u00e9rieure. Le Na\u2083AlF\u2086, en particulier, est tr\u00e8s efficace pour r\u00e9duire la tension superficielle.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10543\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2021\/10\/Melting-Aluminum-Fluxes.jpg\" alt=\"Flux pour la fusion de l&#039;aluminium\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/10\/Melting-Aluminum-Fluxes.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/10\/Melting-Aluminum-Fluxes-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Outre la r\u00e9cup\u00e9ration du m\u00e9tal issu de la phase d'\u00e9cume, les principales missions de la <a href=\"http:\/\/www.alalloycasting.com\/fr\/refining-agent\/\">agent de raffinage<\/a> notamment : la protection de la masse fondue contre une oxydation suppl\u00e9mentaire par recouvrement, dissolution ou mise en suspension des impuret\u00e9s, des oxydes et d\u2019autres particules non m\u00e9talliques. Les gouttelettes de compos\u00e9s salins agissent comme des bulles et maintiennent les inclusions en suspension \u00e0 la surface par flottation. Comme la vitesse \u00e0 laquelle les gouttelettes de fondant remontent \u00e0 la surface est bien inf\u00e9rieure \u00e0 celle des bulles, un certain temps de stabilisation est n\u00e9cessaire. De plus, en raison du gradient de densit\u00e9, environ une demi-heure de d\u00e9cantation suffit pour que les inclusions se d\u00e9posent \u00e0 l\u2019arri\u00e8re du four. Les inclusions plus grosses et plus denses se d\u00e9posent plus rapidement que les inclusions plus petites et moins denses.<\/p>","protected":false},"excerpt":{"rendered":"<p>Melting furnace refining flux removes non-metallic inclusions, the dry ash-like slag produced is easily separated from the liquid metal. Therefore, slag skimming is promoted, and&hellip;<\/p>","protected":false},"author":1,"featured_media":10549,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-10548","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fluxes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Melting Furnace Refining Flux -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Melting furnace refining flux removes non-metallic inclusions, the dry ash-like slag produced is easily separated from the liquid metal.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/fr\/melting-furnace-refining-flux\/\" 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