purification de l'aluminium<\/a> Le fonctionnement d'un \u00e9purateur de gaz repose sur le principe de la flottation par bulles. Selon la classification des \u00e9purateurs de gaz en fonction de leur activit\u00e9, on peut les r\u00e9partir en trois cat\u00e9gories : les gaz inertes, les gaz actifs et les gaz oxydants.<\/p>\nOn entend par \u00ab gaz inerte \u00bb un gaz qui ne r\u00e9agit pas chimiquement avec l'aluminium fondu ni avec l'hydrog\u00e8ne dissous, et qui est insoluble dans l'aluminium ; il s'agit principalement d'Ar, de N\u2082, de He, etc. Ces gaz sont non toxiques, insipides et non polluants ; ils ne n\u00e9cessitent pas d'installations de traitement des gaz r\u00e9siduaires et permettent d'adsorber physiquement et d'\u00e9liminer l'hydrog\u00e8ne de l'aluminium fondu.<\/p>\n
Le gaz actif d\u00e9signe principalement le Cl\u2082, ainsi que le ZnCl, le MnCl, le C\u2082Cl\u2086, le CCl\u2084 et d\u2019autres sels ou chlorures de chlore produits au cours du processus de purification. Le Cl\u2082 est en soi insoluble dans l\u2019aluminium, mais le chlore gazeux r\u00e9agit avec l\u2019aluminium et l\u2019hydrog\u00e8ne dissous dans celui-ci. Les produits de r\u00e9action, HCl et AlCl\u2083, sont tous deux gazeux et insolubles dans l\u2019aluminium fondu. Au d\u00e9part, la pression partielle d\u2019hydrog\u00e8ne dans la bulle d\u2019AlCl\u2083 est nulle, ce qui permet d\u2019\u00e9liminer l\u2019hydrog\u00e8ne pr\u00e9sent dans la masse fondue. Le gaz actif exerce des effets physiques et chimiques d\u2019\u00e9limination de l\u2019hydrog\u00e8ne sur l\u2019aluminium fondu. Cependant, comme il est nocif pour le corps humain, qu\u2019il pollue l\u2019environnement, qu\u2019il corrode facilement les \u00e9quipements et les \u00e9l\u00e9ments chauffants, et qu\u2019il rend la structure cristalline du lingot d\u2019alliage grossi\u00e8re, on utilise principalement des gaz inertes afin d\u2019\u00e9viter tout danger pour la population.<\/p>\n
On entend par \u00ab gaz oxydant \u00bb le gaz g\u00e9n\u00e9r\u00e9 par la d\u00e9composition du fondant sous l'effet d'une temp\u00e9rature \u00e9lev\u00e9e ou par sa r\u00e9action avec l'aluminium fondu ; il s'agit d'une m\u00e9thode de fusion r\u00e9cemment mise au point. Cependant, ce proc\u00e9d\u00e9 g\u00e9n\u00e8re en r\u00e9alit\u00e9 des gaz tels que le NO, le NO\u2082, le CO et le HF, qui peuvent oxyder violemment l'aluminium fondu au cours du processus de purification.<\/p>","protected":false},"excerpt":{"rendered":"
Gas purifier purification refers to the introduction of gas into the aluminum melt or the substances that can produce purified gas. The partial pressure difference…<\/p>","protected":false},"author":1,"featured_media":11182,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[12802,4672],"class_list":["post-11178","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-degassing-with-inert-gas","tag-gas-purification-for-aluminum"],"yoast_head":"\n
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