{"id":3590,"date":"2020-08-11T10:11:54","date_gmt":"2020-08-11T10:11:54","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3590"},"modified":"2020-08-19T06:55:50","modified_gmt":"2020-08-19T06:55:50","slug":"molten-aluminum-filtration","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/molten-aluminum-filtration\/","title":{"rendered":"Filtration de l'aluminium fondu"},"content":{"rendered":"

La filtration de l'aluminium fondu consiste \u00e0 faire passer l'aluminium fondu \u00e0 travers un filtre afin de s\u00e9parer les inclusions solides en suspension dans la masse fondue. Il existe de nombreux filtres pour l'aluminium fondu utilis\u00e9s en fonderie. Voici la classification selon les m\u00e9thodes de filtration de l'aluminium fondu.<\/p>\n

Classification des m\u00e9thodes de filtration de l'aluminium fondu<\/h2>\n

En fonction des propri\u00e9t\u00e9s de filtration, la m\u00e9thode de filtration de la masse fondue d'alliage d'aluminium peut \u00eatre class\u00e9e en deux cat\u00e9gories : la filtration en surface et la filtration en profondeur. En fonction du mat\u00e9riau filtrant, on distingue la filtration \u00e0 l'aide de mat\u00e9riaux maill\u00e9s (tels que le tissu de verre ou le treillis m\u00e9tallique) et la filtration \u00e0 l'aide de mat\u00e9riaux en vrac (tels que les filtres \u00e0 lit profond, filtre en mousse c\u00e9ramique<\/a>) et la filtration en couche liquide (telle que la filtration en couche de flux ou l'affinage par flux \u00e9lectrique) : trois cat\u00e9gories.<\/p>\n

\"Filtration<\/p>\n

La filtration superficielle d\u00e9signe la filtration des impuret\u00e9s solides qui se d\u00e9posent principalement \u00e0 la surface du milieu filtrant ; elle est \u00e9galement appel\u00e9e \u00ab filtration par g\u00e2teau de filtration \u00bb. La filtration sur mat\u00e9riau r\u00e9ticulaire rel\u00e8ve de la filtration de surface. La filtration en profondeur est \u00e9galement appel\u00e9e filtration interne. Les impuret\u00e9s solides se d\u00e9posent principalement \u00e0 l\u2019int\u00e9rieur des pores du milieu filtrant. Au fur et \u00e0 mesure que la filtration progresse, la section effective de filtration des pores diminue progressivement, la perm\u00e9abilit\u00e9 diminue et la pr\u00e9cision de filtration s\u2019am\u00e9liore. La filtration sur mat\u00e9riau en vrac rel\u00e8ve de la filtration en profondeur.<\/p>\n

Le m\u00e9canisme de filtration du filtre \u00e0 mailles consiste principalement \u00e0 s\u00e9parer m\u00e9caniquement les inclusions non m\u00e9talliques macroscopiques et grossi\u00e8res pr\u00e9sentes dans la masse fondue gr\u00e2ce \u00e0 l'action de la grille. Il ne peut retenir que les inclusions de la masse fondue dont la taille est sup\u00e9rieure \u00e0 celle des mailles (en supposant que les inclusions ne puissent pas se d\u00e9former). Le m\u00e9canisme de filtration du filtre en bloc, constitu\u00e9 de mat\u00e9riaux neutres, consiste principalement \u00e0 s\u00e9parer m\u00e9caniquement les inclusions solides pr\u00e9sentes dans la masse fondue par d\u00e9p\u00f4t, par des ph\u00e9nom\u00e8nes hydrodynamiques et par interception directe.<\/p>\n

Le filtre pour mat\u00e9riaux en vrac pr\u00e9sente une grande surface sp\u00e9cifique, ce qui permet \u00e0 la masse fondue et au milieu filtrant d'entrer suffisamment en contact. Lorsque la masse fondue transporte des impuret\u00e9s solides le long des canaux \u00e9troits du filtre, dont les sections varient en fonction de la vitesse d\u2019\u00e9coulement, les inclusions solides, dont la densit\u00e9 et la vitesse diff\u00e8rent de celles de la masse fondue, peuvent se d\u00e9poser sous l\u2019effet de la gravit\u00e9. De plus, en raison de la forme non sph\u00e9rique des particules solides et du champ de force de cisaillement irr\u00e9gulier, les particules solides se d\u00e9placent lat\u00e9ralement, ce qui les am\u00e8ne \u00e0 s\u2019accrocher, \u00e0 se coincer ou \u00e0 \u00eatre adsorb\u00e9es par les parois des canaux. Ce ph\u00e9nom\u00e8ne est renforc\u00e9 par la formation d\u2019une zone de vortex \u00e0 basse pression l\u00e0 o\u00f9 la section transversale du canal poreux change brusquement. Outre le m\u00e9canisme de filtration susmentionn\u00e9, le filtre en bloc constitu\u00e9 de mati\u00e8re active assure \u00e9galement une filtration en profondeur physique et chimique gr\u00e2ce \u00e0 l\u2019effet des forces de surface et des forces chimiques, ce qui permet une purification plus fine de la masse fondue.<\/p>\n

Le filtre pour mat\u00e9riaux en vrac permet de retenir des inclusions solides dont la taille est bien inf\u00e9rieure au diam\u00e8tre de ses pores. Le filtre \u00e0 couche liquide sert \u00e0 laver le m\u00e9tal liquide \u00e0 l'aide d'un flux liquide. Son m\u00e9canisme de filtration repose sur la r\u00e9action physique et chimique entre le flux et les inclusions non m\u00e9talliques, ainsi que sur le mouillage, l'adsorption et la dissolution des inclusions par le flux.<\/p>","protected":false},"excerpt":{"rendered":"

Molten Aluminum Filtration is to pass the aluminum melt through a filter to separate the solid inclusions suspended in the melt. There are many molten…<\/p>","protected":false},"author":1,"featured_media":3591,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[1598,1599,4184,1595,485,1455,1454,432,486,1726,1606,1601,1600,1456,422,1597,1605,418,1453,417,412,1452,1604,298,1603,1602,1596,1594,405],"class_list":["post-3590","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-20-ppi-filter-foam","tag-30-ppi-filter-foam","tag-alumina-fiber-board","tag-alumina-filter","tag-aluminum-casting-filter","tag-asian-foundry-filters","tag-casting-filter","tag-ceramic-filter-foundry","tag-ceramic-filter-manufacturers","tag-ceramic-filter-manufacturing-process","tag-ceramic-filter-price","tag-ceramic-foam-filter-manufacturer-process","tag-ceramic-foam-filter-manufacturers-india","tag-ceramic-foundry-filter","tag-filter-foam-manufacturers","tag-filter-foundry","tag-foam-furnace-filter","tag-foundry-ceramic-filters","tag-foundry-filter","tag-foundry-filters","tag-metal-foam-filter","tag-molten-metal-filtration","tag-open-cell-foam-filter-material","tag-porous-ceramic-filter","tag-reticulated-foam-filter","tag-sic-ceramic-foam-filter","tag-silicon-carbide-ceramic-filter","tag-silicon-carbide-filter","tag-silicon-carbide-foam-filter"],"yoast_head":"\nMolten 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