{"id":10601,"date":"2021-10-14T05:26:37","date_gmt":"2021-10-14T05:26:37","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10601"},"modified":"2021-10-14T05:26:37","modified_gmt":"2021-10-14T05:26:37","slug":"fluxes-for-aluminum-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/fluxes-for-aluminum-refining\/","title":{"rendered":"Flux pour l'affinage de l'aluminium"},"content":{"rendered":"

Lorsqu'on utilise des fondants pour l'affinage de l'aluminium, ceux-ci sont introduits dans le bain de fusion \u00e0 l'aide d'une cloche \u00e0 vide, et les bulles de substances volatiles g\u00e9n\u00e9r\u00e9es par la d\u00e9composition thermique du fondant ou par la r\u00e9action chimique avec le m\u00e9tal permettent d'assurer la d\u00e9shydrog\u00e9nation.<\/p>\n

Plus la quantit\u00e9 de gaz produite par un m\u00eame poids de flux de raffinage de l'aluminium est importante, meilleur est l'effet de d\u00e9gazage. \u00c0 poids \u00e9gal, la quantit\u00e9 de gaz produite par le C2Cl6 est 1,5 fois sup\u00e9rieure \u00e0 celle du MnCl2, ce qui explique son bon effet de d\u00e9gazage. Lors de l'affinage avec du C\u2082Cl\u2086, celui-ci produit de nombreuses bulles, n'absorbe pas l'humidit\u00e9, est disponible en petites quantit\u00e9s et est peu co\u00fbteux. Il s'agit d'un excellent agent d'affinage solide pour le d\u00e9gazage. Cependant, la ventilation et l'\u00e9vacuation des gaz doivent \u00eatre renforc\u00e9es pendant son utilisation afin d'\u00e9viter toute pollution environnementale.<\/p>\n

Dans la production industrielle, divers agents de raffinage non toxiques sont \u00e9galement largement utilis\u00e9s. La plupart d'entre eux sont des flux mixtes compos\u00e9s d'oxydants, tels que le sulfate ou le nitrate, et de carbone \u00e9l\u00e9mentaire, destin\u00e9s \u00e0 g\u00e9n\u00e9rer du CO, du CO\u2082 et d'autres bulles dans la masse fondue.<\/p>\n

\"\"<\/p>\n

Afin d'am\u00e9liorer l'efficacit\u00e9 de l'affinage et de ralentir la vitesse de r\u00e9action, on ajoute \u00e9galement diff\u00e9rentes proportions d'hexachloro\u00e9thane, de poudre de cryolite, de sel de table et de briques r\u00e9fractaires. Outre son effet d'affinage, cet agent d'affinage non toxique exerce \u00e9galement un certain effet m\u00e9tamorphique sur l'alliage Al-Si ; toutefois, lors de l'affinage, il g\u00e9n\u00e8re davantage de fum\u00e9e et de poussi\u00e8re, produit plus de scories et entra\u00eene une perte de m\u00e9tal plus importante.<\/p>\n

Lorsque la charge est enti\u00e8rement fondue dans le bain de fusion et que la temp\u00e9rature de la masse fondue atteint la temp\u00e9rature de fusion, il est possible d'\u00e9liminer une grande quantit\u00e9 de scories oxyd\u00e9es flottant \u00e0 la surface de la masse fondue.<\/p>\n

Avant la coul\u00e9e, une couche de poudre de flux (agent de nettoyage des scories<\/a>) doit \u00eatre r\u00e9parti uniform\u00e9ment \u00e0 la surface du bain fondu afin de faciliter la s\u00e9paration entre les scories d'oxydation et le m\u00e9tal, de faciliter l'op\u00e9ration de d\u00e9crassage et de r\u00e9duire la quantit\u00e9 de m\u00e9tal emport\u00e9e. Le laitier doit \u00eatre retir\u00e9 en douceur afin d\u2019\u00e9viter qu\u2019il ne se m\u00e9lange au bain fondu. L\u2019\u00e9limination du laitier doit \u00eatre minutieuse, car la pr\u00e9sence d\u2019\u00e9cume augmente la teneur en gaz du bain fondu et peut contaminer le m\u00e9tal.<\/p>","protected":false},"excerpt":{"rendered":"

When using the fluxes for aluminum refining, the fluxes are pressed into the molten pool with a bell jar, and the volatile bubbles generated by…<\/p>","protected":false},"author":1,"featured_media":10602,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10601","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nFluxes for Aluminum Refining -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"When using the fluxes for aluminum refining, the fluxes are pressed into the molten pool with a bell jar, and the volatile bubbles generated.\" \/>\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\/fluxes-for-aluminum-refining\/\" \/>\n<meta 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