{"id":8439,"date":"2021-04-20T03:08:12","date_gmt":"2021-04-20T03:08:12","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=8439"},"modified":"2021-04-20T03:08:12","modified_gmt":"2021-04-20T03:08:12","slug":"deep-filtration-of-molten-aluminum","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/deep-filtration-of-molten-aluminum\/","title":{"rendered":"Filtragem profunda de alum\u00ednio fundido"},"content":{"rendered":"

Foram desenvolvidos tr\u00eas tipos de filtros para a filtragem profunda de alum\u00ednio fundido: filtro de meio r\u00edgido, leito granular (filtro de leito profundo) (DBF) e filtro de espuma cer\u00e2mica (CFF). Os dois \u00faltimos dispositivos s\u00e3o os mais comumente utilizados para a filtragem de alum\u00ednio l\u00edquido. Atualmente, mais de 50% do alum\u00ednio forjado mundial utiliza o CFF.<\/p>\n

O CFF apresenta-se na forma de blocos. Eles s\u00e3o produzidos essencialmente por meio da tecnologia de \u201creplica\u00e7\u00e3o de bolhas\u201d. Nesse processo, a espuma de poliuretano \u00e9 revestida com pasta cer\u00e2mica e, em seguida, as pe\u00e7as secas s\u00e3o submetidas a queima. Durante o processo de queima, a espuma de poliuretano presente no revestimento cer\u00e2mico evapora, deixando a espuma cer\u00e2mica porosa (alumina ligada por fosfato). Os filtros de espuma cer\u00e2mica variam em tamanho de 18 cm a 66 cm, e a espessura padr\u00e3o \u00e9 de 5 cm. A taxa de filtra\u00e7\u00e3o geralmente fica entre 0,6 e 1,6 cm\/s.<\/p>\n

O tempo de perman\u00eancia do metal l\u00edquido em CFF<\/a> \u00e9 muito menor do que o de filtro de leito profundo<\/a> DBF. Os CFFs s\u00e3o, em geral, menos eficientes que os DBFs e t\u00eam vida \u00fatil mais curta. Por outro lado, o CFF \u00e9 mais barato e mais f\u00e1cil de usar do que o DBF.<\/p>\n

\"Filtro
Filtro de leito profundo<\/figcaption><\/figure>\n

No caso do alum\u00ednio l\u00edquido, a elimina\u00e7\u00e3o de inclus\u00f5es \u00e9 especialmente importante. Embora tenham sido envidados esfor\u00e7os para reduzir a concentra\u00e7\u00e3o de inclus\u00f5es, a alta reatividade do alum\u00ednio l\u00edquido e a presen\u00e7a de materiais refrat\u00e1rios levar\u00e3o inevitavelmente \u00e0 forma\u00e7\u00e3o de novas inclus\u00f5es no metal l\u00edquido, desde a etapa de processamento da massa fundida at\u00e9 a fundi\u00e7\u00e3o de produtos semiacabados.<\/p>\n

As inclus\u00f5es s\u00e3o classificadas como end\u00f3genas ou ex\u00f3genas, de acordo com sua origem. A rea\u00e7\u00e3o qu\u00edmica do metal l\u00edquido (por exemplo, a forma\u00e7\u00e3o de \u00f3xidos superficiais) resulta na forma\u00e7\u00e3o de inclus\u00f5es end\u00f3genas in situ. As inclus\u00f5es estranhas prov\u00eam do meio externo e penetram no metal l\u00edquido. Tais inclus\u00f5es podem consistir em fragmentos de blocos refrat\u00e1rios provenientes de fornos ou tanques.<\/p>\n

O projeto dos filtros utilizados nas oficinas de fundi\u00e7\u00e3o de alum\u00ednio atuais favorece o uso do modo de filtragem em profundidade. O filtro de espuma cer\u00e2mica<\/a> adota os seguintes modos de filtra\u00e7\u00e3o: filtra\u00e7\u00e3o por bolo de alum\u00ednio fundido, na qual part\u00edculas em suspens\u00e3o maiores que o di\u00e2metro dos poros do filtro s\u00e3o depositadas na entrada do filtro e formam um bolo cuja espessura aumenta, constituindo o meio filtrante propriamente dito; filtra\u00e7\u00e3o profunda de alum\u00ednio fundido, na qual as part\u00edculas em suspens\u00e3o t\u00eam tamanho menor do que o dos orif\u00edcios do filtro, de modo que penetram no filtro e s\u00e3o depositadas nele (provocando, assim, o entupimento gradual do filtro).<\/p>","protected":false},"excerpt":{"rendered":"

Three types of filters for deep filtration of molten aluminum have been developed: rigid medium filter, granular bed (deep bed filter) (DBF) and ceramic foam…<\/p>","protected":false},"author":1,"featured_media":8440,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-8439","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nDeep Filtration of Molten Aluminum with Ceramic Foam Filters<\/title>\n<meta name=\"description\" content=\"The filters for deep filtration of molten aluminum have been developed: rigid medium filter, deep bed filter and ceramic foam filter (CFF).\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/pt\/deep-filtration-of-molten-aluminum\/\" \/>\n<meta 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