{"id":4654,"date":"2020-09-11T07:55:46","date_gmt":"2020-09-11T07:55:46","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4654"},"modified":"2020-09-11T07:55:46","modified_gmt":"2020-09-11T07:55:46","slug":"gas-purification","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/gas-purification\/","title":{"rendered":"Purification des gaz"},"content":{"rendered":"

La purification par gaz est la principale m\u00e9thode de purification de l'aluminium primaire. Le gaz utilis\u00e9 est le chlore, l'azote ou un m\u00e9lange de chlore et d'azote.<\/p>\n

(1) Purification au chlore. Dans le proc\u00e9d\u00e9 de chloration, lorsque du chlore gazeux est introduit dans l\u2019aluminium fondu, de nombreuses bulles d\u2019AlCl\u2083 d\u2019une finesse inhabituelle se forment et se m\u00e9langent compl\u00e8tement \u00e0 l\u2019aluminium fondu. L\u2019hydrog\u00e8ne dissous dans l\u2019aluminium fondu et certaines inclusions m\u00e9caniques sont adsorb\u00e9s sur les bulles et sont \u00e9vacu\u00e9s lorsque celles-ci remontent \u00e0 la surface de l\u2019aluminium fondu. Lors de l\u2019introduction de chlore gazeux, certains \u00e9l\u00e9ments pr\u00e9sentant une charge n\u00e9gative sup\u00e9rieure \u00e0 celle de l\u2019aluminium, tels que le calcium, le sodium ou le magn\u00e9sium, peuvent \u00eatre chlor\u00e9s et se transforment en chlorures correspondants sous l\u2019effet du chlore gazeux. La m\u00e9thode de chloration constitue donc un proc\u00e9d\u00e9 tr\u00e8s efficace de purification de l\u2019aluminium primaire. La quantit\u00e9 de chlore gazeux est de 500 \u00e0 700 g par tonne d\u2019aluminium, mais comme le chlore gazeux est toxique et relativement co\u00fbteux, afin d\u2019\u00e9viter la pollution atmosph\u00e9rique et de r\u00e9duire le co\u00fbt de production des lingots d\u2019aluminium, l\u2019industrie de l\u2019aluminium de troisi\u00e8me g\u00e9n\u00e9ration a progressivement abandonn\u00e9 la m\u00e9thode de chloration au profit d\u2019un gaz inerte. - M\u00e9thode de purification \u00e0 l\u2019azote.<\/p>\n

(2) Proc\u00e9d\u00e9 de purification \u00e0 l'azote. Le N\u2082 est inject\u00e9 directement dans l'aluminium fondu ; celui-ci s'\u00e9coule en continu vers la plate-forme de coul\u00e9e et est balay\u00e9 par l'azote, ce qui permet d'\u00e9liminer les inclusions m\u00e9talliques et l'hydrog\u00e8ne dissous pr\u00e9sents dans l'aluminium fondu, de sorte que de fines bulles d'azote se r\u00e9partissent uniform\u00e9ment dans l'aluminium fondu trait\u00e9. D\u00e9gazage \u00e0 l'azote<\/a> joue un r\u00f4le de purification. L'azote ne pollue pas l'atmosph\u00e8re et poss\u00e8de une grande capacit\u00e9 de purification. Il permet de traiter entre 200 et 600 kg d'aluminium liquide par minute. Les pertes d'aluminium g\u00e9n\u00e9r\u00e9es pendant le processus de purification sont relativement faibles, ce qui explique son utilisation d\u00e9sormais r\u00e9pandue ; toutefois, il n'est pas aussi efficace que le chlore pour \u00e9liminer les impuret\u00e9s de l'aluminium liquide, telles que le calcium, le sodium et le magn\u00e9sium.<\/p>\n

\"Purification<\/p>\n

(3) Purification du m\u00e9lange gazeux. Un m\u00e9lange de chlore et d\u2019azote est utilis\u00e9 pour purifier l\u2019aluminium liquide. Son r\u00f4le est, d\u2019une part, d\u2019\u00e9liminer l\u2019hydrog\u00e8ne et de s\u00e9parer les oxydes, et, d\u2019autre part, d\u2019\u00e9liminer certaines impuret\u00e9s m\u00e9talliques (telles que le Mg) pr\u00e9sentes dans l\u2019aluminium. La composition couramment utilis\u00e9e est de 90% d\u2019azote + 10% de chlore. Il existe \u00e9galement des m\u00e9langes compos\u00e9s de 10% de chlore, de 1% de dioxyde de carbone et de 80% d\u2019azote. Ce m\u00e9lange 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":"

Gas purification is the main primary aluminum purification method. The gas used is chlorine, nitrogen, or a mixture of chlorine and nitrogen. (1) Chlorine purification.…<\/p>","protected":false},"author":1,"featured_media":4656,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4347,4672],"class_list":["post-4654","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-degassing-with-nitrogen","tag-gas-purification-for-aluminum"],"yoast_head":"\nGas Purification for Aluminum, Degassing with Nitrogen<\/title>\n<meta name=\"description\" content=\"Gas purification is the main primary aluminum purification method. 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