{"id":9583,"date":"2021-07-14T09:19:44","date_gmt":"2021-07-14T09:19:44","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=9583"},"modified":"2021-07-14T09:20:30","modified_gmt":"2021-07-14T09:20:30","slug":"deep-filtering","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/deep-filtering\/","title":{"rendered":"Filtrage en profondeur"},"content":{"rendered":"

Les technologies DBF et CFF reposent toutes deux sur le m\u00eame principe de filtration en profondeur. Les technologies de filtration en lit profond (DBF) et de filtration sur mousse c\u00e9ramique (CFF) illustrent bien l'\u00e9volution des techniques de filtration en ligne en dehors des fours de fusion modernes. Ces deux technologies de filtration en profondeur permettent de r\u00e9pondre \u00e0 des exigences de qualit\u00e9 plus \u00e9lev\u00e9es lorsqu'elles sont utilis\u00e9es sur les produits correspondants. La technologie CFF est largement utilis\u00e9e dans la production industrielle. Il s'agit d'une technique en ligne tr\u00e8s courante syst\u00e8me de filtration<\/a> pour la fabrication de produits standard. La technologie de filtration en profondeur DBF est adapt\u00e9e \u00e0 la production en s\u00e9rie de produits de faible \u00e9paisseur et offre une efficacit\u00e9 de filtration sup\u00e9rieure.<\/p>\n

Principe du filtrage en profondeur<\/strong><\/p>\n

Le filtre pour m\u00e9tal en fusion<\/a> Il s'agit d'un milieu comportant de multiples vides, dans lequel l'aluminium fondu s'\u00e9coule selon un parcours pr\u00e9d\u00e9fini. Afin d'\u00e9viter une seconde pollution caus\u00e9e par la couche d'oxyde, le mouvement dans l'interstice suit une trajectoire par couches. Les particules sont retenues par quatre m\u00e9canismes (interception directe, force d'inertie, mouvement brownien et pr\u00e9cipitation gravitationnelle). Les impuret\u00e9s sont progressivement absorb\u00e9es, obstruant peu \u00e0 peu la couche filtrante. L\u2019efficacit\u00e9 de filtration augmente avec l\u2019augmentation de la taille des particules des inclusions et de l\u2019\u00e9paisseur du filtre, et diminue avec l\u2019augmentation de la taille des pores et du d\u00e9bit de m\u00e9tal.<\/p>\n

\"Filtration<\/p>\n

Quel que soit le type de filtre, la taille des particules d'impuret\u00e9s pouvant \u00eatre retenues est bien inf\u00e9rieure \u00e0 celle des pores du milieu filtrant. Cela s'explique par le fait que les particules d'impuret\u00e9s sont pi\u00e9g\u00e9es par le milieu filtrant. On distingue principalement quatre cas de figure, comme suit :<\/p>\n

(1) Interception directe. Lorsque la taille des particules d'impuret\u00e9s est sup\u00e9rieure \u00e0 la taille des pores du m\u00e9dia filtrant, celles-ci sont bloqu\u00e9es \u00e0 l'entr\u00e9e des pores et ainsi \u00e9limin\u00e9es par filtration.
\n(2) La force d'inertie fait d\u00e9vier les particules d'impuret\u00e9s de la direction d'\u00e9coulement du fluide ; celles-ci sont alors attir\u00e9es par la paroi fine des pores du m\u00e9dia filtrant et y sont retenues.
\n(3) Les particules d'impuret\u00e9s effectuent un mouvement brownien irr\u00e9gulier dans la masse fondue et, lorsqu'elles entrent en collision avec le milieu filtrant, elles sont adsorb\u00e9es par celui-ci et y restent retenues.
\n(4) Les particules d'impuret\u00e9s se d\u00e9posent sur la paroi du m\u00e9dia filtrant sous l'effet de la gravit\u00e9 et sont ainsi retenues.<\/p>\n

Quelle que soit la m\u00e9thode de filtration utilis\u00e9e, l'efficacit\u00e9 de la filtration d\u00e9pend du d\u00e9bit de l'\u00e9l\u00e9ment filtrant. Plus la vitesse de filtration est faible, meilleure est l'efficacit\u00e9 de la filtration, et inversement.<\/p>","protected":false},"excerpt":{"rendered":"

Both DBF and CFF are based on the same deep filtering technology. Deep Bed Filtration (DBF) and Ceramic Foam Filtration (CFF) technologies are representative of…<\/p>","protected":false},"author":1,"featured_media":9584,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[12281,12289,12305,12288,12304,12297,12295,12311,12293,12309,12294,12310,12284,12300,12290,12306,12286,12285,12301,12287,12303,12291,12307,12283,12299,12282,12298,12302,12280,12292,12308,12296],"class_list":["post-9583","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-alcan-aluminium-deep-filtering","tag-alcan-aluminium-limited-deep-filtering","tag-alcan-aluminium-limited-supplier-deep-filtering","tag-alcan-aluminium-ltd-deep-filtering","tag-alcan-aluminium-ltd-supplier-deep-filtering","tag-alcan-aluminium-supplier-deep-filtering","tag-alcan-aluminum-corp-deep-filtering","tag-alcan-aluminum-corp-supplier-deep-filtering","tag-alcan-aluminum-corporation-deep-filtering","tag-alcan-aluminum-corporation-supplier-deep-filtering","tag-alcan-cable-company-deep-filtering","tag-alcan-cable-company-supplier-deep-filtering","tag-alcan-cable-deep-filtering","tag-alcan-cable-supplier-deep-filtering","tag-alcan-company-deep-filtering","tag-alcan-company-supplier-deep-filtering","tag-alcan-deep-filtering","tag-alcan-electric-deep-filtering","tag-alcan-electric-supplier-deep-filtering","tag-alcan-highway-deep-filtering","tag-alcan-highway-supplier-deep-filtering","tag-alcan-inc-deep-filtering","tag-alcan-inc-supplier-deep-filtering","tag-alcan-manufacturing-company-deep-filtering","tag-alcan-manufacturing-company-supplier-deep-filtering","tag-alcan-packaging-deep-filtering","tag-alcan-packaging-supplier-deep-filtering","tag-alcan-supplier-deep-filtering","tag-rio-tinto-alcan-deep-filtering","tag-rio-tinto-alcan-inc-deep-filtering","tag-rio-tinto-alcan-inc-supplier-deep-filtering","tag-rio-tinto-alcan-supplier-deep-filtering"],"yoast_head":"\nDeep Filtering, Deep Bed Filter DBF and Ceramic Foam Filter CFF<\/title>\n<meta name=\"description\" content=\"Both DBF and CFF are based on the same deep filtering technology. 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