{"id":4822,"date":"2020-09-17T02:48:11","date_gmt":"2020-09-17T02:48:11","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4822"},"modified":"2020-09-17T02:48:11","modified_gmt":"2020-09-17T02:48:11","slug":"filters-of-molten-aluminum","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/filters-of-molten-aluminum\/","title":{"rendered":"Filtros de alum\u00ednio fundido"},"content":{"rendered":"

Os filtros de alum\u00ednio fundido s\u00e3o importantes para as inclus\u00f5es oxidadas; existem dois tipos de filtros para remover essas inclus\u00f5es do alum\u00ednio fundido.<\/p>\n

Filtros de alum\u00ednio fundido<\/h2>\n

Filtro de leito profundo<\/strong><\/a>: O filtro de leito profundo utiliza v\u00e1rias camadas de esferas de alumina com di\u00e2metros diferentes, dispostas dentro do tanque de refino; da parte inferior \u00e0 superior, as esferas de alumina apresentam di\u00e2metros crescentes.<\/p>\n

\"Filtros<\/p>\n

Quando o alum\u00ednio fundido flui atrav\u00e9s das esferas de alumina a partir da caixa de refino, \u00e0 medida que o alum\u00ednio fundido passa, as inclus\u00f5es de \u00f3xido presentes no alum\u00ednio fundido s\u00e3o retidas pelas esferas de alumina. Como o alum\u00ednio fundido passa primeiro pelas esferas de alumina de di\u00e2metro maior, ele se oxida. O di\u00e2metro das esferas de alumina \u00e9 grande e o espa\u00e7o entre elas tamb\u00e9m \u00e9 grande, de modo que as inclus\u00f5es de \u00f3xido maiores presentes no alum\u00ednio fundido s\u00e3o bloqueadas primeiro pelas esferas de alumina. \u00c0 medida que o alum\u00ednio fundido flui pelas esferas de alumina menores, as inclus\u00f5es oxidadas menores presentes no alum\u00ednio fundido s\u00e3o filtradas. Ap\u00f3s a filtragem pelas esferas de alumina multicamadas, as inclus\u00f5es oxidadas no alum\u00ednio fundido s\u00e3o filtradas e removidas, e o efeito de filtragem \u00e9 melhor. Para inclus\u00f5es oxidadas acima de 20 \u03bcm, a efici\u00eancia de filtragem dos filtros de leito profundo \u00e9 superior a 90%, e para inclus\u00f5es oxidadas acima de 15 \u03bcm, a efici\u00eancia de filtragem \u00e9 superior a 80%.<\/p>\n

As desvantagens s\u00e3o: devido ao grande volume de alum\u00ednio fundido no filtro de leito profundo, todo o alum\u00ednio fundido presente no filtro precisa ser drenado ao trocar de liga, e as esferas de alumina precisam ser substitu\u00eddas. Isso leva muito tempo, e o custo da substitui\u00e7\u00e3o das esferas de alumina, bem como o custo de produ\u00e7\u00e3o decorrente da drenagem do alum\u00ednio l\u00edquido, \u00e9 relativamente alto. Portanto, esse m\u00e9todo de filtragem \u00e9 adequado apenas para diversas ligas ou para processos de produ\u00e7\u00e3o em que a troca de ligas ocorre com menor frequ\u00eancia.<\/p>\n

CFF filtro de espuma cer\u00e2mica<\/a><\/strong> \u00e9 um filtro com 2\u2033 de espessura, colocado horizontalmente no Caixa de filtro CFF<\/a>. As dimens\u00f5es do filtro s\u00e3o 17\u2033\u00d717\u201d, 20\u201d\u00d720\u201d, 23\u201d\u00d723\u201d e outros tamanhos, para atender \u00e0s diferentes taxas de vaz\u00e3o exigidas pela linha de produ\u00e7\u00e3o.<\/p>\n

\"Filtros<\/p>\n

A filtragem do alum\u00ednio fundido ocorre principalmente por meio dos microporos do filtro de espuma cer\u00e2mica. Quando o alum\u00ednio fundido flui atrav\u00e9s dos microporos, as inclus\u00f5es presentes no alum\u00ednio fundido s\u00e3o submetidas a diferentes for\u00e7as, incluindo o resultado da a\u00e7\u00e3o combinada de v\u00e1rias formas de movimento. As inclus\u00f5es oxidadas s\u00e3o retidas no filtro cer\u00e2mico. Ap\u00f3s a filtragem, substitua-o por um novo filtro de espuma cer\u00e2mica.<\/p>\n

De acordo com as inclus\u00f5es oxidadas de diferentes tamanhos, o di\u00e2metro e o n\u00famero de microporos do filtro cer\u00e2mico variam, sendo classificados em 20 PPI, 30 ppi, 40 ppi, 45 ppi, 50 ppi, 60 ppi, 80 ppi, 100 ppi, etc. Quanto maior o valor, maior \u00e9 o n\u00famero de microporos por unidade de comprimento; e quanto menor o di\u00e2metro dos microporos, melhor \u00e9 o efeito de filtragem. Mas, ao mesmo tempo, fatores como o tamanho das inclus\u00f5es no alum\u00ednio fundido devem ser considerados. Se o tamanho das inclus\u00f5es for grande, o uso de filtros cer\u00e2micos de poros finos bloquear\u00e1 facilmente os orif\u00edcios do filtro e afetar\u00e1 o fluxo do alum\u00ednio fundido.<\/p>\n

Dependendo do tamanho das inclus\u00f5es, \u00e0s vezes podem ser utilizados dois filtros cer\u00e2micos com tamanhos de microporos diferentes, como filtros de 40 ppi e 60 ppi, nos quais o l\u00edquido de alum\u00ednio passa primeiro pelo filtro de 40 ppi, e as inclus\u00f5es maiores presentes no l\u00edquido de alum\u00ednio s\u00e3o filtradas primeiro, e, em seguida, as inclus\u00f5es menores s\u00e3o filtradas por um filtro de 60 ppi, de modo que isso n\u00e3o apenas garanta o efeito de filtragem, mas tamb\u00e9m evite que as inclus\u00f5es maiores bloqueiem o filtro de 60 ppi.<\/p>\n

Utilizando filtragem em duas etapas, s\u00e3o empregados em combina\u00e7\u00e3o um filtro de 40 pi e um filtro de 60 ppi. Para inclus\u00f5es oxidadas com tamanho superior a 20 \u03bcm, a efici\u00eancia de filtragem pode chegar a 90%. Para inclus\u00f5es oxidadas com tamanho superior a 15 \u03bcm, a efici\u00eancia de filtragem pode chegar a 80%, o que se aproxima do efeito de refinamento dos filtros de leito profundo.<\/p>","protected":false},"excerpt":{"rendered":"

Filters of molten aluminum are important for oxidized inclusions, there are two filters to remove the inclusions in molten aluminum. Filters of Molten Aluminum Deep…<\/p>","protected":false},"author":1,"featured_media":4839,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[433,1595,485,1455,1454,1451,104,105,432,1440,486,4658,1447,427,1439,426,219,425,1456,422,1597,4694,1441,165,418,1448,1453,417,416,1444,412,1452,298,1446,1596,406,1594,405],"class_list":["post-4822","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-alumina-ceramic-foam-filter","tag-alumina-filter","tag-aluminum-casting-filter","tag-asian-foundry-filters","tag-casting-filter","tag-ceramic-disc-filter","tag-ceramic-filter","tag-ceramic-filter-for-foundry","tag-ceramic-filter-foundry","tag-ceramic-filter-malaysia","tag-ceramic-filter-manufacturers","tag-ceramic-filter-supplier","tag-ceramic-foam-filter-china","tag-ceramic-foam-filter-manufacturers","tag-ceramic-foam-filter-manufacturers-in-india","tag-ceramic-foam-filter-manufacturing-process","tag-ceramic-foam-filter-suppliers","tag-ceramic-foam-filters-for-casting","tag-ceramic-foundry-filter","tag-filter-foam-manufacturers","tag-filter-foundry","tag-filters-of-molten-aluminum","tag-foam-ceramic-filter","tag-foam-filter-manufacturers","tag-foundry-ceramic-filters","tag-foundry-coatings","tag-foundry-filter","tag-foundry-filters","tag-honeycomb-ceramic-filter","tag-lanik-ceramic-foam-filters","tag-metal-foam-filter","tag-molten-metal-filtration","tag-porous-ceramic-filter","tag-porous-filter-material","tag-silicon-carbide-ceramic-filter","tag-silicon-carbide-ceramic-foam-filter","tag-silicon-carbide-filter","tag-silicon-carbide-foam-filter"],"yoast_head":"\nFilters 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