{"id":6408,"date":"2020-11-13T06:27:46","date_gmt":"2020-11-13T06:27:46","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6408"},"modified":"2020-11-13T06:27:46","modified_gmt":"2020-11-13T06:27:46","slug":"flux-refining-methods","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/flux-refining-methods\/","title":{"rendered":"M\u00e9thodes d'affinage par flux"},"content":{"rendered":"

De mani\u00e8re g\u00e9n\u00e9rale, la purification en four comprend la m\u00e9thode au fondant, la m\u00e9thode d'affinage au gaz (gaz actif et d\u00e9gradable), la purification sous vide et la purification sur site. Parmi celles-ci, la purification au fondant et la purification au gaz sont les m\u00e9thodes d'affinage en four les plus couramment utilis\u00e9es dans l'industrie. La purification par fondant intervient au cours du processus de fusion des alliages d\u2019aluminium : le fondant est ajout\u00e9 au bain de fusion et, gr\u00e2ce \u00e0 une s\u00e9rie d\u2019effets physiques et chimiques, permet de d\u00e9gazer le bain et d\u2019\u00e9liminer les impuret\u00e9s. La capacit\u00e9 d\u2019\u00e9limination des impuret\u00e9s du flux est d\u00e9termin\u00e9e par l\u2019adsorption et la dissolution des inclusions oxyd\u00e9es pr\u00e9sentes dans le bain de fusion par le flux, ainsi que par l\u2019interaction chimique entre le flux et le bain de fusion. Plus la tension interfaciale entre le fondant et les inclusions est faible, meilleure est l\u2019adsorption par le fondant et plus l\u2019\u00e9limination des impuret\u00e9s est efficace. Outre les m\u00e9thodes d\u2019affinage par fondant destin\u00e9es au d\u00e9gazage et \u00e0 l\u2019\u00e9limination des impuret\u00e9s, il existe d\u2019autres types de fondants, tels que les agents de recouvrement, agent de nettoyage des scories<\/a>, etc. Cet article traite principalement des flux utilis\u00e9s pour le d\u00e9gazage et la formation de scories.<\/p>\n

Contrairement \u00e0 la purification par flux, la purification par gaz repose principalement sur l'injection d'un gaz actif ou inerte dans la masse fondue. Outre le recours \u00e0 la loi de la pression partielle des gaz pour obtenir un d\u00e9gazage ainsi que l\u2019adsorption et l\u2019inclusion des bulles, le gaz actif peut \u00e9galement r\u00e9agir directement avec l\u2019hydrog\u00e8ne pr\u00e9sent dans la masse fondue pour former des produits gazeux, ce qui permet d\u2019assurer la diffusion et le d\u00e9gazage, la flottation et l\u2019\u00e9limination des scories. De plus, le gaz actif peut \u00e9galement r\u00e9agir avec les m\u00e9taux alcalins ou alcalino-terreux pr\u00e9sents dans la masse fondue pour g\u00e9n\u00e9rer des sels de faible densit\u00e9, qui remontent \u00e0 la surface de l\u2019aluminium fondu afin d\u2019\u00e9liminer les m\u00e9taux alcalins et alcalino-terreux. Prenons l\u2019exemple du chlore, un gaz r\u00e9actif typique : la r\u00e9action fondamentale du chlore entrant dans la masse fondue est la suivante :<\/p>\n

3Cl\u2082 + 2Al = 2AlCl\u2083\u2191
\nCl\u2082 + H\u2082 = 2HCl\u2191
\nCl\u2082 + 2Na = 2NaCl<\/p>\n

\"M\u00e9thodes<\/p>\n

On constate que le chlore lui-m\u00eame ainsi que les produits de la r\u00e9action de chloration, \u00e0 savoir l'AlCl\u2083 et l'HCl, sont tous des gaz qui s'\u00e9chappent spontan\u00e9ment de la masse fondue. La purification est ainsi assur\u00e9e. De plus, il peut r\u00e9agir directement avec l'hydrog\u00e8ne pr\u00e9sent dans la masse fondue, ce qui permet d'\u00e9liminer cet hydrog\u00e8ne. Il s'agit d'un agent d'affinage de la masse fondue tr\u00e8s efficace.<\/p>","protected":false},"excerpt":{"rendered":"

Generally speaking, furnace purification includes flux method, gas refining method (active and degradable gas), vacuum purification, and field purification. Among them, flux purification and gas…<\/p>","protected":false},"author":1,"featured_media":6409,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6408","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nFlux Refining Methods for Aluminum Degassing and Impurity Removal<\/title>\n<meta name=\"description\" content=\"Flux and gas purification are the most widely used furnace refining methods in the industry. 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