{"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\/pt\/filtration-method\/","title":{"rendered":"M\u00e9todo de filtra\u00e7\u00e3o"},"content":{"rendered":"<p>Na filtragem mec\u00e2nica, quando o metal fundido passa pelo meio filtrante, este atua como uma barreira mec\u00e2nica contra inclus\u00f5es n\u00e3o met\u00e1licas. Al\u00e9m disso, o meio filtrante tamb\u00e9m exerce um efeito de adsor\u00e7\u00e3o sobre as inclus\u00f5es. Geralmente, quanto menor for a abertura e maior for a espessura do meio filtrante, menor ser\u00e1 a vaz\u00e3o do alum\u00ednio l\u00edquido e melhor ser\u00e1 o efeito da filtra\u00e7\u00e3o mec\u00e2nica.<br \/>\nDe acordo com os diferentes meios filtrantes, o m\u00e9todo de filtragem de alum\u00ednio l\u00edquido pode ser dividido nos seguintes tipos.<\/p>\n<p><strong>M\u00e9todo de filtragem em malha<\/strong><\/p>\n<p>Esse m\u00e9todo permite que a massa fundida passe por um filtro de vidro ou de malha de arame resistente ao calor, e a esc\u00f3ria \u00e9 retida mecanicamente e separada da massa fundida. Isso tem um efeito significativo na remo\u00e7\u00e3o da pel\u00edcula de \u00f3xido em forma de escamas e de grandes inclus\u00f5es de esc\u00f3ria. No entanto, ele s\u00f3 consegue filtrar a esc\u00f3ria cujo tamanho \u00e9 menor que o da malha, portanto, o efeito de purifica\u00e7\u00e3o \u00e9 insuficiente. O filtro de malha quebra facilmente, tem vida \u00fatil curta e precisa ser substitu\u00eddo com frequ\u00eancia.<\/p>\n<p><strong>Filtragem em leito profundo<\/strong><\/p>\n<p>O <a href=\"https:\/\/www.alalloycasting.com\/pt\/filtration-method-in-aluminum-liquid\/\">filtro de leito profundo<\/a> \u00e9 um leito compactado composto por meios filtrantes de diferentes materiais (fundente, refrat\u00e1rio, cer\u00e2mica, etc.) e diferentes formas (esf\u00e9ricas, em blocos, granulares, em folhas). \u00c0s vezes, o fundente l\u00edquido tamb\u00e9m \u00e9 utilizado como meio filtrante. Al\u00e9m do efeito de barreira mec\u00e2nica do leito compactado, h\u00e1 tamb\u00e9m adsor\u00e7\u00e3o, dissolu\u00e7\u00e3o ou intera\u00e7\u00e3o qu\u00edmica entre o meio filtrante e a esc\u00f3ria. A vantagem desse m\u00e9todo \u00e9 que h\u00e1 uma grande \u00e1rea de contato entre o material fundido e o meio filtrante, e o efeito de filtragem e remo\u00e7\u00e3o de esc\u00f3ria \u00e9 melhor do que no m\u00e9todo de filtro de malha. Geralmente, quanto mais espessa for a camada de filtragem, menor ser\u00e1 o tamanho das part\u00edculas do meio filtrante e melhor ser\u00e1 o efeito de filtragem. No entanto, se o tamanho das part\u00edculas for muito pequeno, isso afetar\u00e1 a vaz\u00e3o do material fundido e reduzir\u00e1 a produtividade.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4766\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/06\/Filtration-Method-2.jpg\" alt=\"M\u00e9todo de filtra\u00e7\u00e3o\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/06\/Filtration-Method-2.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/06\/Filtration-Method-2-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<h2>M\u00e9todo de filtra\u00e7\u00e3o microporosa r\u00edgida<\/h2>\n<p>Existem dois tipos de filtros microporosos r\u00edgidos: filtros de tubos microporosos de cer\u00e2mica e placas filtrantes de cer\u00e2mica.<\/p>\n<p><strong>Filtros de tubos microporosos de cer\u00e2mica<\/strong><\/p>\n<p>O filtro de tubo cer\u00e2mico microporoso \u00e9 fabricado com areia de corindo de um determinado tamanho de part\u00edcula e vidro com baixo teor de sil\u00edcio como aglutinante. \u00c9 formado por prensagem, secagem a baixa temperatura e sinteriza\u00e7\u00e3o a alta temperatura. Trata-se de um filtro r\u00edgido com poros uniformes. Quando o metal fundido contendo a esc\u00f3ria passa pelo filtro, a esc\u00f3ria \u00e9 separada do metal fundido devido ao atrito, \u00e0 adsor\u00e7\u00e3o, \u00e0 sedimenta\u00e7\u00e3o inercial e a outros efeitos da parede do tubo, e o metal fundido pode passar pelos microporos. Esse m\u00e9todo permite filtrar inclus\u00f5es particuladas menores que o tamanho dos poros e \u00e9 um dos m\u00e9todos de filtragem mais confi\u00e1veis. A desvantagem \u00e9 que o custo da filtragem \u00e9 alto e, \u00e0s vezes, o refinador de gr\u00e3os pode ficar retido.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4765\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/06\/Filtration-Method-1.jpg\" alt=\"M\u00e9todo de filtra\u00e7\u00e3o\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/06\/Filtration-Method-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/06\/Filtration-Method-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p><strong>Placas filtrantes de espuma cer\u00e2mica<\/strong><\/p>\n<p>O <a href=\"https:\/\/www.alalloycasting.com\/pt\/ceramic-foam-filter\/\">filtro de espuma cer\u00e2mica<\/a> A placa (CFF) \u00e9 um produto cer\u00e2mico poroso semelhante a uma esponja, fabricado com alumina, \u00f3xido de cromo, etc. O filtro de espuma cer\u00e2mica possui uma estrutura de rede tridimensional exclusiva e uma estrutura de poros interpenetrantes, e sua espessura \u00e9 de aproximadamente 20 a 60 mm. O PPI (poros por polegada) \u00e9 o n\u00famero de poros por polegada de comprimento, utilizado para expressar suas especifica\u00e7\u00f5es. A placa de filtro cer\u00e2mica \u00e9 fr\u00e1gil e deve ser limpa com cuidado ap\u00f3s a instala\u00e7\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"<p>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&hellip;<\/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":"<!-- 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