{"id":2305,"date":"2020-06-18T04:00:12","date_gmt":"2020-06-18T04:00:12","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=2305"},"modified":"2020-09-28T01:24:46","modified_gmt":"2020-09-28T01:24:46","slug":"filtration-mechanisms-for-molten-aluminum","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/filtration-mechanisms-for-molten-aluminum\/","title":{"rendered":"Mecanismos de filtra\u00e7\u00e3o para alum\u00ednio fundido"},"content":{"rendered":"

A placa filtrante de cer\u00e2mica separa as impurezas por meio dos tr\u00eas mecanismos de filtragem para alum\u00ednio fundido: filtragem por peneiramento, filtragem por bolo e filtragem em leito profundo.<\/p>\n

Mecanismos de filtra\u00e7\u00e3o para alum\u00ednio fundido<\/h2>\n

Filtragem por peneiramento<\/strong><\/p>\n

Filtragem mec\u00e2nica (peneiramento): quando o tamanho das inclus\u00f5es \u00e9 maior do que o tamanho dos poros da placa filtrante, esta atua como uma peneira, impedindo que as inclus\u00f5es passem por ela. A filtragem tradicional com tecido de fibra de vidro adota esse mecanismo.<\/p>\n

Filtragem de bolo<\/strong><\/p>\n

Filtra\u00e7\u00e3o por camada sedimentar (bolo): Depois que as inclus\u00f5es previamente retidas formam uma camada cont\u00ednua na superf\u00edcie do filtro de espuma cer\u00e2mica de alumina<\/a> placa, o tamanho dos poros para a filtragem n\u00e3o \u00e9 mais o tamanho dos poros da placa filtrante, mas sim o tamanho dos poros da camada de bolo rec\u00e9m-formada. \u00c0 medida que a camada de bolo fica mais espessa, os espa\u00e7os nela se tornam cada vez menores, e muitas inclus\u00f5es ficam retidas na superf\u00edcie e nos espa\u00e7os internos da camada de bolo. Ao mesmo tempo, a resist\u00eancia da placa filtrante ao alum\u00ednio l\u00edquido continua a aumentar. Ap\u00f3s atingir um determinado n\u00edvel, torna-se dif\u00edcil para o alum\u00ednio l\u00edquido passar pela placa de filtragem. Nesse momento, a placa de filtragem deve ser descartada. Durante o processo de filtragem, a mudan\u00e7a evidente para o modo de bolo \u00e9 o aumento gradual da press\u00e3o do alum\u00ednio fundido.<\/p>\n

Filtragem em leito profundo<\/strong><\/p>\n

Filtra\u00e7\u00e3o em leito profundo<\/a>: Quando as inclus\u00f5es, que s\u00e3o muito menores do que o tamanho dos poros do filtro, entram na placa filtrante junto com o alum\u00ednio l\u00edquido, elas s\u00e3o retidas pela parede interna da placa filtrante. Quanto mais espessa for a placa filtrante, maior ser\u00e1 o efeito desse modelo. Esse modo permite filtrar inclus\u00f5es com tamanho em torno de 20 \u00b5m.<\/p>\n

\"Mecanismos<\/p>\n

A ocorr\u00eancia do modo de leito profundo depende principalmente da capacidade das part\u00edculas de inclus\u00e3o de serem retidas ap\u00f3s colidirem com a parede interna da placa filtrante. O percurso na placa filtrante \u00e9 sinuoso e irregular. Quando o alum\u00ednio l\u00edquido passa pelos orif\u00edcios sinuosos e interligados da placa de filtro cer\u00e2mica, as inclus\u00f5es internas s\u00e3o depositadas na parede do canal sob a a\u00e7\u00e3o da hidrodin\u00e2mica, in\u00e9rcia, intercepta\u00e7\u00e3o, colis\u00e3o, adsor\u00e7\u00e3o etc., de modo a se obter alum\u00ednio l\u00edquido limpo.<\/p>\n

Al\u00e9m disso, a placa filtrante de cer\u00e2mica n\u00e3o \u00e9 simplesmente uma barreira mec\u00e2nica contra as impurezas; a adsor\u00e7\u00e3o f\u00edsica e qu\u00edmica, os microporos e a adsor\u00e7\u00e3o qu\u00edmica na parede interna da placa filtrante tamb\u00e9m contribuem para a reten\u00e7\u00e3o das impurezas. Portanto, o tamanho das impurezas filtradas \u00e9 muito menor do que o tamanho dos orif\u00edcios da placa filtrante.<\/p>\n

Ao filtrar com filtro de espuma cer\u00e2mica<\/a>, os tr\u00eas mecanismos acima s\u00e3o combinados. Na fase inicial, a peneira\u00e7\u00e3o superficial ret\u00e9m as part\u00edculas grandes, enquanto as part\u00edculas pequenas s\u00e3o removidas por um mecanismo de filtra\u00e7\u00e3o profunda. Com a forma\u00e7\u00e3o de dep\u00f3sitos superficiais, a camada depositada passa a reter tanto as part\u00edculas grandes quanto as pequenas. Al\u00e9m disso, pequenas part\u00edculas de inclus\u00e3o na malha s\u00e3o capturadas por meio do mecanismo de filtra\u00e7\u00e3o profunda, e o efeito de filtragem da placa filtrante ser\u00e1 melhor. Quando as part\u00edculas adsorvidas atingem a satura\u00e7\u00e3o, ou seja, quando o n\u00famero de part\u00edculas adsorvidas da massa fundida \u00e9 igual ao n\u00famero de part\u00edculas removidas pelo fluxo da massa fundida, a capacidade de remo\u00e7\u00e3o de esc\u00f3ria diminui.<\/p>","protected":false},"excerpt":{"rendered":"

The ceramic filter plate separates the inclusions through the three filtration mechanisms for molten aluminum of sieving, cake, and deep bed filtration. Filtration Mechanisms for…<\/p>","protected":false},"author":1,"featured_media":5183,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[482,481,475,465,479,453,461,476,466,478,477,469,468,467,474,480,454,442,445,449,448,451,460,452,470,472,471,457,455,464,463,462,441,437,443,444,456,436,435,438,439,447,440,473,446,458,459,450],"class_list":["post-2305","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminium-casting-company-filtration-mechanisms","tag-aluminium-die-casting-companies-filtration-mechanisms","tag-aluminium-gravity-die-casting-filtration-mechanisms","tag-aluminium-hot-top-filtration-mechanisms","tag-aluminium-investment-casting-filtration-mechanisms","tag-aluminium-strip-filtration-mechanisms","tag-aluminum-billet-casting-filtration-mechanisms","tag-aluminum-can-foundry-filtration-mechanisms","tag-aluminum-casting-companies-filtration-mechanisms","tag-aluminum-casting-equipment-filtration-mechanisms","tag-aluminum-casting-grain-filtration-mechanisms","tag-aluminum-casting-near-me-filtration-mechanisms","tag-aluminum-die-casting-companies-filtration-mechanisms","tag-aluminum-foundry-near-me-filtration-mechanisms","tag-aluminum-gravity-casting-filtration-mechanisms","tag-aluminum-gravity-die-casting-filtration-mechanisms","tag-aluminum-ingot-filtration-mechanisms","tag-aluminum-metallurgy-filtration-mechanisms","tag-aluminum-or-aluminium-filtration-mechanisms","tag-cast-aluminum-filtration-mechanisms","tag-castable-refractory-filtration-mechanisms","tag-ceramic-insulation-filtration-mechanisms","tag-ceramic-shell-casting-filtration-mechanisms","tag-continuous-casting-filtration-mechanisms","tag-die-casting-companies-near-me-filtration-mechanisms","tag-electric-aluminum-foundry-filtration-mechanisms","tag-foundry-aluminum-casting-filtration-mechanisms","tag-foundry-factory-filtration-mechanisms","tag-foundry-filtration-mechanisms","tag-hot-top-aluminium-filtration-mechanisms","tag-hot-top-cast-filtration-mechanisms","tag-hot-top-casting-filtration-mechanisms","tag-liquid-aluminum-filtration-mechanisms","tag-materials-and-metallurgy-filtration-mechanisms","tag-melting-aluminum-filtration-mechanisms","tag-melting-point-of-aluminum-filtration-mechanisms","tag-metal-foundry-filtration-mechanisms","tag-metal-metallurgy-filtration-mechanisms","tag-metallurgical-engineering-filtration-mechanisms","tag-metallurgical-industry-filtration-mechanisms","tag-metallurgical-products-filtration-mechanisms","tag-metallurgy-company-filtration-mechanisms","tag-metallurgy-of-aluminium-filtration-mechanisms","tag-molten-aluminum-casting-filtration-mechanisms","tag-molten-aluminum-filtration-mechanisms","tag-shell-casting-filtration-mechanisms","tag-shell-mould-casting-filtration-mechanisms","tag-what-is-filtration-mechanisms"],"yoast_head":"\nFiltration 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