{"id":2301,"date":"2020-06-18T09:08:37","date_gmt":"2020-06-18T09:08:37","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=2301"},"modified":"2020-09-15T03:52:07","modified_gmt":"2020-09-15T03:52:07","slug":"filtration-method","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/filtration-method\/","title":{"rendered":"M\u00e9thode de filtration"},"content":{"rendered":"

Avec la filtration m\u00e9canique, lorsque le m\u00e9tal en fusion traverse le m\u00e9dia filtrant, celui-ci constitue une barri\u00e8re m\u00e9canique contre les inclusions non m\u00e9talliques. De plus, le m\u00e9dia filtrant exerce \u00e9galement un effet d'adsorption sur ces inclusions. En r\u00e8gle g\u00e9n\u00e9rale, plus les mailles sont fines et plus le m\u00e9dia filtrant est \u00e9pais, plus le d\u00e9bit de l'aluminium en fusion est faible et plus l'efficacit\u00e9 de la filtration m\u00e9canique est \u00e9lev\u00e9e.
\nEn fonction des diff\u00e9rents mat\u00e9riaux filtrants utilis\u00e9s, la m\u00e9thode de filtration de l'aluminium liquide peut \u00eatre class\u00e9e selon les types suivants.<\/p>\n

M\u00e9thode de filtrage par maillage<\/strong><\/p>\n

Cette m\u00e9thode consiste \u00e0 faire passer la masse fondue \u00e0 travers un filtre en verre ou en treillis m\u00e9tallique r\u00e9sistant \u00e0 la chaleur ; les scories sont alors retenues m\u00e9caniquement et s\u00e9par\u00e9es de la masse fondue. Cela permet d\u2019\u00e9liminer efficacement le film d\u2019oxyde en paillettes et les grosses inclusions de scories. Cependant, ce proc\u00e9d\u00e9 ne permet de filtrer que les scories dont la taille est inf\u00e9rieure \u00e0 celle des mailles du treillis, ce qui limite l\u2019efficacit\u00e9 de la purification. Le filtre \u00e0 mailles se casse facilement, sa dur\u00e9e de vie est courte et il doit \u00eatre remplac\u00e9 fr\u00e9quemment.<\/p>\n

Filtration \u00e0 lit profond<\/strong><\/p>\n

Le filtre \u00e0 lit profond<\/a> Il s'agit d'un lit compact\u00e9 compos\u00e9 de mat\u00e9riaux filtrants de diff\u00e9rentes natures (fondant, r\u00e9fractaire, c\u00e9ramique, etc.) et de diff\u00e9rentes formes (sph\u00e9riques, en blocs, granulaires, en feuilles). Il arrive parfois qu'un fondant liquide soit \u00e9galement utilis\u00e9 comme mat\u00e9riau filtrant. Outre l\u2019effet de barri\u00e8re m\u00e9canique du lit tass\u00e9, il existe \u00e9galement des ph\u00e9nom\u00e8nes d\u2019adsorption, de dissolution ou d\u2019interaction chimique entre le milieu filtrant et les scories. L\u2019avantage de cette m\u00e9thode r\u00e9side dans la grande surface de contact entre la masse fondue et le milieu filtrant, ce qui permet d\u2019obtenir un meilleur effet de filtration et d\u2019\u00e9limination des scories qu\u2019avec la m\u00e9thode du filtre \u00e0 mailles. En g\u00e9n\u00e9ral, plus la couche filtrante est \u00e9paisse et plus la taille des particules du milieu filtrant est petite, meilleur est l\u2019effet de filtration. Cependant, si la taille des particules est trop petite, cela affectera le d\u00e9bit de la masse fondue et r\u00e9duira la productivit\u00e9.<\/p>\n

\"M\u00e9thode<\/p>\n

M\u00e9thode de filtration sur mat\u00e9riau rigide microporeux<\/h2>\n

Il existe deux types de filtres microporeux rigides : les filtres \u00e0 tubes microporeux en c\u00e9ramique et les plaques filtrantes en c\u00e9ramique.<\/p>\n

Filtres \u00e0 tubes microporeux en c\u00e9ramique<\/strong><\/p>\n

Le filtre \u00e0 tubes microporeux en c\u00e9ramique est compos\u00e9 de sable de corindon d'une granulom\u00e9trie donn\u00e9e et de verre \u00e0 faible teneur en silicium servant de liant. Il est fabriqu\u00e9 par pressage, s\u00e9chage \u00e0 basse temp\u00e9rature et frittage \u00e0 haute temp\u00e9rature. Il s'agit d'un filtre rigide dot\u00e9 de pores uniformes. Lorsque le m\u00e9tal en fusion contenant les scories est achemin\u00e9, celles-ci sont s\u00e9par\u00e9es du m\u00e9tal en fusion sous l\u2019effet du frottement, de l\u2019adsorption, de la s\u00e9dimentation par inertie et d\u2019autres effets li\u00e9s \u00e0 la paroi du tube, tandis que le m\u00e9tal en fusion peut passer \u00e0 travers les micropores. Cette m\u00e9thode permet de filtrer les inclusions particulaires plus petites que la taille des pores et constitue l\u2019une des m\u00e9thodes de filtration les plus fiables. L'inconv\u00e9nient r\u00e9side dans le co\u00fbt \u00e9lev\u00e9 de la filtration et dans le fait que l'affineur de grain peut parfois rester coinc\u00e9.<\/p>\n

\"M\u00e9thode<\/p>\n

Plaques filtrantes en mousse c\u00e9ramique<\/strong><\/p>\n

Le filtre en mousse c\u00e9ramique<\/a> La plaque (CFF) est une plaque en c\u00e9ramique poreuse de type \u00e9ponge, compos\u00e9e d'alumine, d'oxyde de chrome, etc. Le filtre en mousse c\u00e9ramique pr\u00e9sente une structure en r\u00e9seau tridimensionnelle unique et une structure poreuse interp\u00e9n\u00e9trante ; son \u00e9paisseur est comprise entre environ 20 et 60 mm. Le PPI (pores par pouce) correspond au nombre de pores par pouce de longueur et permet d'en exprimer les caract\u00e9ristiques techniques. La plaque filtrante en c\u00e9ramique est fragile et doit \u00eatre nettoy\u00e9e avec soin apr\u00e8s son installation.<\/p>","protected":false},"excerpt":{"rendered":"

Using mechanical filtration, when the metal melt passes through the filter media, it has a mechanical barrier to non-metallic inclusions. In addition, the filter media…<\/p>","protected":false},"author":1,"featured_media":4763,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233,20],"tags":[535,534,528,518,532,506,514,529,519,531,530,522,521,520,527,533,507,495,498,502,501,504,513,505,523,525,524,508,510,517,516,515,494,490,496,497,509,489,488,491,492,500,493,526,499,511,512,503],"class_list":["post-2301","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-ceramic-foam-filter","tag-aluminium-casting-company-cff-filtration","tag-aluminium-die-casting-companies-cff-filtration","tag-aluminium-gravity-die-casting-cff-filtration","tag-aluminium-hot-top-cff-filtration","tag-aluminium-investment-casting-cff-filtration","tag-aluminium-strip-cff-filtration","tag-aluminum-billet-casting-cff-filtration","tag-aluminum-can-foundry-cff-filtration","tag-aluminum-casting-companies-cff-filtration","tag-aluminum-casting-equipment-cff-filtration","tag-aluminum-casting-grain-cff-filtration","tag-aluminum-casting-near-me-cff-filtration","tag-aluminum-die-casting-companies-cff-filtration","tag-aluminum-foundry-near-me-cff-filtration","tag-aluminum-gravity-casting-cff-filtration","tag-aluminum-gravity-die-casting-cff-filtration","tag-aluminum-ingot-cff-filtration","tag-aluminum-metallurgy-cff-filtration","tag-aluminum-or-aluminium-cff-filtration","tag-cast-aluminum-cff-filtration","tag-castable-refractory-cff-filtration","tag-ceramic-insulation-cff-filtration","tag-ceramic-shell-casting-cff-filtration","tag-continuous-casting-cff-filtration","tag-die-casting-companies-near-me-cff-filtration","tag-electric-aluminum-foundry-cff-filtration","tag-foundry-aluminum-casting-cff-filtration","tag-foundry-cff-filtration","tag-foundry-factory-cff-filtration","tag-hot-top-aluminium-cff-filtration","tag-hot-top-cast-cff-filtration","tag-hot-top-casting-cff-filtration","tag-liquid-aluminum-cff-filtration","tag-materials-and-metallurgy-cff-filtration","tag-melting-aluminum-cff-filtration","tag-melting-point-of-aluminum-cff-filtration","tag-metal-foundry-cff-filtration","tag-metal-metallurgy-cff-filtration","tag-metallurgical-engineering-cff-filtration","tag-metallurgical-industry-cff-filtration","tag-metallurgical-products-cff-filtration","tag-metallurgy-company-cff-filtration","tag-metallurgy-of-aluminium-cff-filtration","tag-molten-aluminum-casting-cff-filtration","tag-molten-aluminum-cff-filtration","tag-shell-casting-cff-filtration","tag-shell-mould-casting-cff-filtration","tag-what-is-cff-filtration"],"yoast_head":"\nFiltration 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