{"id":9928,"date":"2021-08-17T03:47:25","date_gmt":"2021-08-17T03:47:25","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=9928"},"modified":"2021-08-17T03:47:25","modified_gmt":"2021-08-17T03:47:25","slug":"gas-purification-process","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/gas-purification-process\/","title":{"rendered":"Proc\u00e9d\u00e9 de purification des gaz"},"content":{"rendered":"

Le processus d'\u00e9limination de l'hydrog\u00e8ne est le processus de purification du gaz. On ajoute artificiellement des gaz inertes (Ar, N\u2082, etc.) ou des gaz actifs insolubles dans la masse d'aluminium fondu (Cl\u2082, C\u2082Cl\u2084, etc.) \u00e0 la masse d'aluminium fondu, de sorte que l'hydrog\u00e8ne pr\u00e9sent dans celle-ci soit absorb\u00e9 par ces bulles de gaz. Les bulles remontent \u00e0 la surface et s'\u00e9chappent de la masse d'aluminium fondu.<\/p>\n

Le processus de purification des gaz peut \u00eatre divis\u00e9 en plusieurs \u00e9tapes, \u00e0 savoir :<\/strong><\/p>\n

Sous l'effet de la convection et de la diffusion, les atomes d'hydrog\u00e8ne pr\u00e9sents dans l'aluminium fondu migrent vers l'interface gaz-liquide situ\u00e9e entre l'aluminium fondu et les bulles introduites.
\nL'atome d'hydrog\u00e8ne passe de l'\u00e9tat dissous \u00e0 l'\u00e9tat adsorb\u00e9.
\nLes atomes d'hydrog\u00e8ne adsorb\u00e9s \u00e0 l'interface gaz-liquide interagissent entre eux pour former des mol\u00e9cules d'hydrog\u00e8ne.
\nLes mol\u00e9cules d'hydrog\u00e8ne se d\u00e9sorbent \u00e0 l'interface gaz-liquide.
\nLes mol\u00e9cules se diffusent dans la phase gazeuse et remontent \u00e0 la surface avec les bulles de gaz qui se forment, s'\u00e9chappant ainsi de l'aluminium en fusion.<\/p>\n

La m\u00e9thode de base pour am\u00e9liorer l'efficacit\u00e9 de la purification des gaz consiste \u00e0 :<\/strong><\/p>\n

Il est possible d'augmenter le nombre de bulles introduites afin d'accro\u00eetre la surface de contact effective entre l'aluminium en fusion et les bulles.
\nR\u00e9duire autant que possible le diam\u00e8tre des bulles introduites et augmenter la surface de contact entre le gaz et le bain d'aluminium fondu.
\nAllonger autant que possible la distance de flottement des bulles introduites dans le bain d'aluminium en fusion, augmenter le temps de s\u00e9jour des bulles dans le bain d'aluminium en fusion, c'est-\u00e0-dire prolonger la dur\u00e9e du processus de d\u00e9pollution gazeuse du bain d'aluminium en fusion.<\/p>\n

Outre ces trois m\u00e9thodes de base, il existe des techniques plus avanc\u00e9es telles que MINT, SNIF, FILD, d\u00e9gazage en ligne<\/a>, et les technologies de purification. Le principe de base consiste \u00e0 utiliser la rotation m\u00e9canique de la t\u00eate de soufflage et l\u2019effet de soufflage de l\u2019argon ou de l\u2019azote pour fragmenter le gaz inerte introduit dans l\u2019aluminium fondu en petits groupes de bulles, qui remontent lentement \u00e0 la surface de l\u2019aluminium fondu, augmentant ainsi consid\u00e9rablement la surface de contact entre le gaz et le liquide, prolongeant le temps d\u2019action et am\u00e9liorant l\u2019efficacit\u00e9 du d\u00e9gazage. Parall\u00e8lement, gr\u00e2ce \u00e0 la forte agitation provoqu\u00e9e par la t\u00eate de soufflage, les petites inclusions sont regroup\u00e9es en agglom\u00e9rats plus volumineux, et ces petits groupes d\u2019air denses ont de fortes chances de retenir les scories, ce qui am\u00e9liore \u00e9galement l\u2019efficacit\u00e9 de l\u2019\u00e9limination des scories.<\/p>","protected":false},"excerpt":{"rendered":"

The hydrogen removal process is the gas purification process. Artificially add inert gases (Ar, N2, etc.) or active gases that are insoluble in the aluminum…<\/p>","protected":false},"author":1,"featured_media":9929,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[12364,4313],"class_list":["post-9928","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-gas-purification-process-in-aluminum-melt","tag-metal-degassing"],"yoast_head":"\nGas Purification Process in Aluminum Melt, Metal Degassing<\/title>\n<meta name=\"description\" content=\"The hydrogen removal process is the gas purification process. 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