{"id":6341,"date":"2020-11-12T01:29:26","date_gmt":"2020-11-12T01:29:26","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6341"},"modified":"2020-11-12T01:29:26","modified_gmt":"2020-11-12T01:29:26","slug":"fluxes-purification","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/fluxes-purification\/","title":{"rendered":"M\u00e9thode de purification des flux"},"content":{"rendered":"<p>L'aluminium fondu pr\u00e9sent dans la cellule d'\u00e9lectrolyse contenant de nombreuses impuret\u00e9s, il doit \u00eatre filtr\u00e9 avant la coul\u00e9e des lingots d'aluminium. Les m\u00e9thodes couramment utilis\u00e9es comprennent les fondants, les gaz et les techniques de clarification. Les principales m\u00e9thodes sont les suivantes :<\/p>\n<p><strong>Proc\u00e9d\u00e9 de purification des flux et proc\u00e9d\u00e9 de purification des gaz<\/strong><\/p>\n<p>1. La m\u00e9thode de purification par flux consiste \u00e0 utiliser le <a href=\"http:\/\/www.alalloycasting.com\/fr\/refining-flux\/\">flux de raffinage<\/a> ajout\u00e9 \u00e0 la solution, qui pr\u00e9sente les caract\u00e9ristiques suivantes : faible densit\u00e9, forte activit\u00e9 et grande capacit\u00e9 d'adsorption. L'adsorption des oxydes pr\u00e9sents dans la solution entra\u00eene la formation de nouvelles gouttelettes qui remontent \u00e0 la surface. Une \u00e9cume se forme apr\u00e8s refroidissement. Le lingot d'aluminium peut \u00eatre coul\u00e9 apr\u00e8s \u00e9limination de cette \u00e9cume.<\/p>\n<p>2. La purification au gaz, qui fait g\u00e9n\u00e9ralement appel \u00e0 du chlore, de l'azote ou un m\u00e9lange de chlore et d'azote, constitue l'une des principales m\u00e9thodes de purification de l'aluminium primaire.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6343\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/11\/Fluxes-Purification-1.jpg\" alt=\"Purification des flux\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/11\/Fluxes-Purification-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/11\/Fluxes-Purification-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p><strong>Purification au chlore<\/strong><\/p>\n<p>Le chlore gazeux pr\u00e9sent dans l'aluminium fondu g\u00e9n\u00e8re de nombreuses petites bulles qui se m\u00e9langent compl\u00e8tement \u00e0 la masse d'aluminium fondu ; l'hydrog\u00e8ne qui y est dissous, ainsi que certaines inclusions m\u00e9caniques, peuvent alors \u00eatre adsorb\u00e9s sur ces petites bulles. Lorsque les bulles remontent \u00e0 la surface de l'aluminium fondu, elles sont \u00e9vacu\u00e9es.<\/p>\n<p><strong>Proc\u00e9d\u00e9 de purification de l'azote<\/strong><\/p>\n<p>Le chlore \u00e9tant toxique et co\u00fbteux, on a recours d\u00e9sormais \u00e0 la purification \u00e0 l'azote. Des billes d'alumine sont utilis\u00e9es comme milieu filtrant. L'azote (N\u2082) est directement inject\u00e9 dans l'aluminium fondu. L'aluminium fondu est introduit en continu dans le four de purification, traverse la couche filtrante de billes d'alumine et est balay\u00e9 par de l'azote, ce qui permet d'\u00e9liminer les inclusions non m\u00e9talliques et l'hydrog\u00e8ne dissous pr\u00e9sents dans l'aluminium fondu, avant d'\u00eatre \u00e9vacu\u00e9 en continu. Les fines bulles d'azote sont ainsi r\u00e9parties uniform\u00e9ment et exercent un effet purificateur sur l'aluminium liquide trait\u00e9.<\/p>\n<p><strong>Proc\u00e9d\u00e9 de purification d'un m\u00e9lange gazeux<\/strong><\/p>\n<p>Un m\u00e9lange de chlore et d'azote est utilis\u00e9 pour purifier l'aluminium fondu. Son r\u00f4le est, d'une part, d'\u00e9liminer l'hydrog\u00e8ne et de s\u00e9parer les oxydes, et, d'autre part, d'\u00e9liminer certaines impuret\u00e9s m\u00e9talliques (telles que le magn\u00e9sium) pr\u00e9sentes dans l'aluminium. La composition couramment utilis\u00e9e est de 90% d'azote + 10% de chlore. Il existe \u00e9galement une composition \u00e0 base de 10% de chlore + 10% de dioxyde de carbone + 80% d\u2019azote. Cette composition offre de meilleurs r\u00e9sultats : le dioxyde de carbone permet une bonne diffusion du chlore et de l\u2019azote, ce qui peut r\u00e9duire la dur\u00e9e de l\u2019op\u00e9ration.<\/p>","protected":false},"excerpt":{"rendered":"<p>Because there are many impurities in the aluminum liquid in the electrolytic cell, it must be filtered before casting the aluminum ingot. Common methods include&hellip;<\/p>","protected":false},"author":1,"featured_media":6342,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[240,6441],"class_list":["post-6341","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-flux-refining","tag-fluxes-purification"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fluxes Purification Method for Molten Metal Refining<\/title>\n<meta name=\"description\" content=\"The fluxes purification method is to add the refining flux to molten metal, which has the high activity, and strong adsorption capacity.\" \/>\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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