{"id":3616,"date":"2020-08-12T09:11:12","date_gmt":"2020-08-12T09:11:12","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3616"},"modified":"2020-08-19T06:40:52","modified_gmt":"2020-08-19T06:40:52","slug":"molten-aluminum-filtration-method","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/molten-aluminum-filtration-method\/","title":{"rendered":"M\u00e9todo de filtragem de alum\u00ednio fundido"},"content":{"rendered":"

O m\u00e9todo de filtragem do alum\u00ednio fundido consiste basicamente em fazer com que o alum\u00ednio fundido passe por um filtro cer\u00e2mico para separar as inclus\u00f5es s\u00f3lidas suspensas na massa fundida. Esse m\u00e9todo remove principalmente as inclus\u00f5es presentes na massa fundida e tem pouco efeito na remo\u00e7\u00e3o de hidrog\u00eanio. Portanto, na pr\u00e1tica, o m\u00e9todo de filtragem do alum\u00ednio fundido \u00e9 frequentemente combinado com o m\u00e9todo de sopro.<\/p>\n

O m\u00e9todo de sopro, tamb\u00e9m conhecido como m\u00e9todo de flota\u00e7\u00e3o por bolhas, \u00e9 um processo de purifica\u00e7\u00e3o do alum\u00ednio fundido desenvolvido na d\u00e9cada de 1970, que apresenta, especialmente, bons resultados na remo\u00e7\u00e3o de hidrog\u00eanio. Um g\u00e1s inerte (como nitrog\u00eanio, arg\u00f4nio, etc.) \u00e9 introduzido no alum\u00ednio fundido para formar bolhas. O hidrog\u00eanio presente no metal fundido se difunde para dentro dessas bolhas sob a a\u00e7\u00e3o da diferen\u00e7a de press\u00e3o parcial e \u00e9 eliminado \u00e0 medida que as bolhas sobem, alcan\u00e7ando-se assim o objetivo de desgaseifica\u00e7\u00e3o. Durante o processo de flutua\u00e7\u00e3o, as bolhas tamb\u00e9m podem absorver algumas inclus\u00f5es oxidadas, o que contribui para a remo\u00e7\u00e3o de impurezas.<\/p>\n

\"M\u00e9todo<\/p>\n

Com o aumento dos requisitos de pureza do metal fundido, a tecnologia de remo\u00e7\u00e3o de hidrog\u00eanio foi aprimorada e desenvolvida, passando da inje\u00e7\u00e3o original por tubo \u00fanico para o cabe\u00e7ote de sopro com m\u00faltiplos orif\u00edcios e, posteriormente, para o atual bocal rotativo. Desde a d\u00e9cada de 1980, o m\u00e9todo de sopro por bocal rotativo tornou-se a principal tend\u00eancia de desenvolvimento da tecnologia avan\u00e7ada de purifica\u00e7\u00e3o de alum\u00ednio no exterior. Por exemplo, o sistema online sistema de desgaseifica\u00e7\u00e3o<\/a> pela Adtech, m\u00e9todo de flutua\u00e7\u00e3o com g\u00e1s inerte por bico rotativo. O equipamento \u00e9 dotado de dois bicos rotativos de grafite para g\u00e1s. O g\u00e1s forma pequenas bolhas dispersas por meio do rotor do bico. Ao mesmo tempo, com o rotor agitando o metal fundido, as bolhas se dispersam uniformemente por todo o metal fundido, o que aumenta a \u00e1rea de contato entre o g\u00e1s e o l\u00edquido, prolonga a dist\u00e2ncia percorrida e o tempo de perman\u00eancia das bolhas no alum\u00ednio fundido, aumenta o volume de g\u00e1s e faz com que o g\u00e1s no metal fundido e as inclus\u00f5es de \u00f3xido flutuem at\u00e9 a superf\u00edcie do metal fundido, de modo a alcan\u00e7ar o efeito de purifica\u00e7\u00e3o por desgaseifica\u00e7\u00e3o e remo\u00e7\u00e3o de impurezas. A efici\u00eancia de remo\u00e7\u00e3o de hidrog\u00eanio desse m\u00e9todo \u00e9 cerca de tr\u00eas vezes maior do que a do m\u00e9todo de inje\u00e7\u00e3o por tubo \u00fanico.<\/p>\n

Existem muitos tipos de filtragem, e os melhores s\u00e3o o tubo filtrante de corindo e a placa filtrante de cer\u00e2mica em espuma. O tubo filtrante de corindo apresenta alta efici\u00eancia de filtragem, mas \u00e9 caro e de uso inconveniente. A placa filtrante de cer\u00e2mica em espuma \u00e9 um novo tipo de material filtrante cer\u00e2mico desenvolvido nos \u00faltimos anos. Suas caracter\u00edsticas s\u00e3o facilidade de uso, bom efeito de filtragem e pre\u00e7o baixo. \u00c9 amplamente utilizado em todo o mundo. A liga de alum\u00ednio fundida com mais de 50% dos pa\u00edses desenvolvidos \u00e9 filtrada por filtros de cer\u00e2mica em espuma. Atualmente, a tecnologia de filtro de cer\u00e2mica em espuma do tipo caixa \u00e9 amplamente utilizada. Trata-se de um Caixa de filtro CFF<\/a> com sistema de tampa de pr\u00e9-aquecimento a g\u00e1s. Quando o alum\u00ednio l\u00edquido passa pela placa filtrante, as inclus\u00f5es na massa fundida atravessam a barreira mec\u00e2nica do filtro para serem eliminadas e separadas. A precis\u00e3o da filtra\u00e7\u00e3o pode ser de 2 \u03bcm e a efici\u00eancia da filtra\u00e7\u00e3o pode chegar a 99%.<\/p>","protected":false},"excerpt":{"rendered":"

Molten aluminum filtration method is mainly to let the aluminum melt pass through the ceramic filter to separate the solid inclusions suspended in the melt.…<\/p>","protected":false},"author":1,"featured_media":3618,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[4345,1695,1697,1685,1683,1678,1687,1690,1698,1699,21,1694,1677,1691,1684,420,419,1682,1679,1686,484,89,1696,483,1688,1692,1693,223,1689,752],"class_list":["post-3616","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-alumina-ceramic","tag-alumina-ceramic-foam-filter-aluminum-casting-industry","tag-alumina-ceramic-foam-filter-for-casting-metal-purification","tag-alumina-ceramic-foam-filter-for-molten-aluminum-filtration","tag-alumina-ceramic-foam-filter-manufacturers","tag-alumina-ceramic-foam-filter-plate","tag-alumina-ceramic-foam-filter-porous-ceramic-filter","tag-alumina-filter-ceramic-foam-for-precision-casting-filter","tag-aluminum-casting-using-alumina-ceramic-foam-filter","tag-ceralu-ai203-ceramic-foam-filters-for-aluminum","tag-ceramic-foam-filter","tag-ceramic-foam-filter-cff-a-for-aluminum-casting","tag-ceramic-foam-filter-for-liquid-aluminum","tag-ceramic-foam-filter-with-fiber-blanket-sides","tag-china-ceramic-foam-filter-cff","tag-foam-filter","tag-foam-filter-material","tag-foam-filters-with-gasket","tag-high-grade-ceramic-foam-filters","tag-industrial-filters-for-filtration-of-molten-aluminium","tag-liquid-aluminum-filter","tag-molten-aluminum-filter","tag-molten-metal-cleanliness-when-casting-aluminium","tag-molten-metal-filter","tag-porous-silicon-carbide-ceramic-foam-filter","tag-produce-alumina-ceramic-foam-filters","tag-produce-aluminium-casting-ceramic-foam-filters","tag-sell-ceramic-foam-filters","tag-square-porous-alumina-ceramic-foam-filter","tag-zirconia-ceramic-foam-filter"],"yoast_head":"\nMolten 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