{"id":6992,"date":"2020-12-11T08:59:06","date_gmt":"2020-12-11T08:59:06","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6992"},"modified":"2020-12-11T09:09:04","modified_gmt":"2020-12-11T09:09:04","slug":"flux-for-alkali-metal-removal","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/flux-for-alkali-metal-removal\/","title":{"rendered":"Flux pour l'\u00e9limination des m\u00e9taux alcalins"},"content":{"rendered":"<p>Afin d'\u00e9liminer les m\u00e9taux alcalins (\u00e0 savoir Na, Ca, K, Li), l'utilisation d'un fondant destin\u00e9 \u00e0 l'\u00e9limination des m\u00e9taux alcalins constitue une m\u00e9thode reconnue pour le traitement de l'aluminium fondu. Dans des conditions d'\u00e9quilibre, les chlorures de chacun de ces \u00e9l\u00e9ments sont form\u00e9s en tant que produits de r\u00e9action. \u00c0 l'exception du LiCl, tous ces sels halog\u00e9nures sont des esp\u00e8ces pures et se pr\u00e9sentent sous forme solide \u00e0 la temp\u00e9rature normale de traitement ; ils peuvent donc \u00eatre facilement s\u00e9par\u00e9s \u00e0 la surface de la masse fondue sous forme de surnageant, puis \u00e9limin\u00e9s par \u00e9cumage.<\/p>\n<p>Les m\u00e9taux alcalins sont g\u00e9n\u00e9ralement pr\u00e9sents dans la masse fondue \u00e0 des concentrations inf\u00e9rieures \u00e0 500 ppm. Conform\u00e9ment \u00e0 la loi d'action de masse (la vitesse de r\u00e9action est approximativement proportionnelle \u00e0 la concentration du r\u00e9actif), des sels m\u00e9tastables hors \u00e9quilibre se forment, tels que l'AlCl\u2083 et le MgCl\u2082 (si le Mg est pr\u00e9sent). Ces halog\u00e9nures sont ind\u00e9sirables car ils affectent consid\u00e9rablement la transmission par voie a\u00e9rienne au cours du proc\u00e9d\u00e9. De plus, le MgCl\u2082 fond \u00e0 1 306 \u00b0F et fond g\u00e9n\u00e9ralement aux temp\u00e9ratures normales de traitement par fusion. La fusion est tr\u00e8s ind\u00e9sirable car il est difficile d\u2019\u00e9liminer le sel qui s\u2019accumule en surface. Il est donc hautement souhaitable de faire r\u00e9agir ou de complexer les \u00e9l\u00e9ments alcalins afin de produire un sel \u00e0 point de fusion plus \u00e9lev\u00e9, qui se s\u00e9pare plus efficacement sous forme solide par flottation \u00e0 la surface.<\/p>\n<p>En dispersant le <a href=\"http:\/\/www.alalloycasting.com\/fr\/flux-degassing\/\">gaz de flux<\/a> Dans le bain de fusion d\u2019aluminium, le fondant destin\u00e9 \u00e0 l\u2019\u00e9limination des m\u00e9taux alcalins est introduit dans la cuve principale vers le bas, dans le sens axial, puis dispers\u00e9 par la roue \u00e0 aubes rotative mont\u00e9e sur l\u2019arbre. Cependant, cette m\u00e9thode n\u2019est pas sans limites. La turbine en rotation g\u00e9n\u00e8re un tourbillon autour de l\u2019arbre, ce qui signifie que la majeure partie du m\u00e9tal en fusion tourne ou circule autour de l\u2019arbre de la turbine \u00e0 une vitesse proche de celle de cette derni\u00e8re. Le m\u00e9tal en fusion ajout\u00e9 au milieu de culture a tendance \u00e0 circuler et \u00e0 faire fondre les m\u00e9taux avec une dispersibilit\u00e9 minimale. De plus, le tourbillon a pour effet d\u2019augmenter la surface du m\u00e9tal en fusion expos\u00e9e \u00e0 l\u2019air.<\/p>\n<p>L'exposition accrue du m\u00e9tal en fusion \u00e0 l'air entra\u00eene une formation accrue de scories, leur entra\u00eenement subs\u00e9quent et leurs effets secondaires n\u00e9fastes. Lorsque le fondant est un gaz, le vortex peut poser des probl\u00e8mes d'une autre mani\u00e8re. Le gaz de flux est entra\u00een\u00e9 par une force physique vers le centre du vortex, ce qui a pour cons\u00e9quence de d\u00e9placer les autres parties et d\u2019emp\u00eacher la masse fondue de traiter correctement le gaz de fusion. L\u2019efficacit\u00e9 de la m\u00e9thode s\u2019en trouve donc r\u00e9duite en raison d\u2019une fusion partielle. N\u2019utilisez pas de flux pour traiter le corps. De plus, le gaz de flux entra\u00een\u00e9 dans le flux de m\u00e9tal en fusion a tendance \u00e0 se regrouper, ce qui entra\u00eene la formation de bulles de gaz de flux plus grosses dans le bain de fusion. Des bulles plus grosses r\u00e9duiront l\u2019efficacit\u00e9 du flux, car une quantit\u00e9 moindre de m\u00e9tal en fusion est trait\u00e9e.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6993\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/12\/Flux-for-Alkali-Metal-Removal-1.jpg\" alt=\"Flux pour l&#039;\u00e9limination des m\u00e9taux alcalins\" width=\"400\" height=\"320\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Flux-for-Alkali-Metal-Removal-1.jpg 400w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Flux-for-Alkali-Metal-Removal-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<p>Parmi les m\u00e9thodes couramment utilis\u00e9es pour emp\u00eacher la formation de tourbillons, on peut citer l'insertion de d\u00e9flecteurs ou de tiges dans la masse fondue. Cependant, l'utilisation d'un d\u00e9flecteur n'est pas souhaitable en raison du volume mort situ\u00e9 derri\u00e8re son bord arri\u00e8re. Une autre m\u00e9thode consiste \u00e0 limiter la puissance fournie \u00e0 la turbine. Toutefois, cela r\u00e9duit consid\u00e9rablement le rendement.<\/p>\n<p>Il est donc urgent de mettre au point un proc\u00e9d\u00e9 de flux plus efficace, capable d'emp\u00eacher la r\u00e9absorption des scories de la surface dans la masse fondue par la formation de tourbillons, par exemple en assurant une dispersion fine du mat\u00e9riau de flux dans l'ensemble de la masse fondue, et d'am\u00e9liorer le contact entre le m\u00e9tal fondu et le flux afin d'\u00e9liminer les m\u00e9taux alcalins, ce qui permettrait d'optimiser le flux de la masse fondue.<\/p>","protected":false},"excerpt":{"rendered":"<p>In order to remove alkali metal elements (ie, Na, Ca, K, Li), the flux for alkali metal removal is a recognized method for processing molten&hellip;<\/p>","protected":false},"author":1,"featured_media":6994,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[4335,4333,122,1708,4290,4289,4331,4336,4342,4344,4337,4343,4338,4332,2218,4334,4341,4339,4340,123,4330,4328,4329],"class_list":["post-6992","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-aluminium-casting-flux","tag-aluminium-degassing-tablets","tag-aluminum-casting-flux","tag-aluminum-casting-foundry-flux","tag-aluminum-degassing-flux","tag-aluminum-degassing-tablets","tag-aluminum-flux","tag-aluminum-flux-powder","tag-casting-flux","tag-coverall-flux","tag-degas-tablets","tag-degassing-agent","tag-degassing-tablets","tag-flux-aluminium","tag-flux-for-aluminum-melting","tag-flux-for-melting-aluminum-cans","tag-flux-melting","tag-foundry-flux","tag-low-temperature-flux","tag-refining-flux","tag-tundish-covering-compound","tag-tundish-covering-powder","tag-tundish-powder"],"yoast_head":"<!-- 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