{"id":4894,"date":"2020-09-18T07:06:30","date_gmt":"2020-09-18T07:06:30","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4894"},"modified":"2020-09-18T07:06:30","modified_gmt":"2020-09-18T07:06:30","slug":"ceramic-filter-filtration","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/ceramic-filter-filtration\/","title":{"rendered":"Filtragem por filtro cer\u00e2mico"},"content":{"rendered":"<p>Os principais fatores que determinam a efici\u00eancia de filtragem dos filtros cer\u00e2micos s\u00e3o a precis\u00e3o de filtragem e a taxa de filtragem. A precis\u00e3o de filtragem refere-se ao tamanho das menores part\u00edculas s\u00f3lidas presentes no meio fluido que o filtro \u00e9 capaz de reter. Para um mesmo meio fluido, quanto menor o tamanho dos poros, maior a precis\u00e3o de filtragem, e vice-versa. Para meios l\u00edquidos, as part\u00edculas de impureza que podem ser retidas correspondem a cerca de 1\/15 a 1\/5 do tamanho dos poros do elemento filtrante. Para meios gasosos, devido ao movimento browniano relativamente ativo, o efeito de captura por difus\u00e3o \u00e9 significativamente aumentado, e a precis\u00e3o de filtra\u00e7\u00e3o \u00e9, consequentemente, elevada para 1\/30 a 1\/20 do tamanho dos poros. A taxa de filtra\u00e7\u00e3o refere-se \u00e0 vaz\u00e3o do meio fluido que passa pela cer\u00e2mica porosa por unidade de tempo. A viscosidade do meio fluido, a press\u00e3o de trabalho do meio e a microporosidade do pr\u00f3prio elemento filtrante s\u00e3o os principais fatores que influenciam esse processo.<\/p>\n<p>O <a href=\"http:\/\/www.alalloycasting.com\/pt\/alumina-ceramic-foam-filter\/\">filtro de espuma cer\u00e2mica<\/a>\u00a0separa as inclus\u00f5es na liga l\u00edquida de fundi\u00e7\u00e3o por meio de efeitos f\u00edsicos e qu\u00edmicos sobre o metal l\u00edquido e alcan\u00e7a a efici\u00eancia de filtragem do filtro cer\u00e2mico na purifica\u00e7\u00e3o do metal fundido. O mecanismo de filtragem inclui, principalmente, o mecanismo do bolo de filtra\u00e7\u00e3o, o efeito de superf\u00edcie e o efeito de retifica\u00e7\u00e3o.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4896\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Ceramic-Filter-Filtration-2.jpg\" alt=\"Filtragem por filtro cer\u00e2mico\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Ceramic-Filter-Filtration-2.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Ceramic-Filter-Filtration-2-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>A complexa estrutura da espuma cer\u00e2mica \u00e9 capaz de bloquear mecanicamente as esc\u00f3rias de maneira eficaz. Quando o metal fundido passa pelo filtro de espuma cer\u00e2mica com estrutura complexa, a separa\u00e7\u00e3o mec\u00e2nica do meio filtrante ret\u00e9m as inclus\u00f5es maiores do que os poros da superf\u00edcie do filtro e faz com que elas se precipitem na extremidade do filtro por onde o metal l\u00edquido flui, tornando-se parte integrante do filtro. Com o aumento do n\u00famero de inclus\u00f5es acumuladas na superf\u00edcie do filtro, forma-se gradualmente uma camada de \u201cbolo de filtra\u00e7\u00e3o\u201d, o que torna o canal de fluxo do metal l\u00edquido ainda mais estreito, de modo que a superf\u00edcie do novo meio filtrante possa reter inclus\u00f5es mais finas. Ao mesmo tempo, o interior do meio tamb\u00e9m exerce um efeito de filtragem. Entre os muitos pequenos orif\u00edcios que permeiam o corpo cer\u00e2mico, alguns apresentam min\u00fasculas fendas e outros s\u00e3o becos sem sa\u00edda. Essas diferentes \u00e1reas de varia\u00e7\u00e3o s\u00e3o poss\u00edveis pontos de intercepta\u00e7\u00e3o das inclus\u00f5es. H\u00e1 tamb\u00e9m um efeito de \u201cbolo de filtra\u00e7\u00e3o\u201d no interior do filtro.<\/p>\n<p>Quando o metal fundido flui atrav\u00e9s do corpo cer\u00e2mico de estrutura complexa, ele se divide em muitas pequenas correntes, o que aumenta a \u00e1rea de contato e a probabilidade de contato entre as inclus\u00f5es no metal fundido e o meio filtrante. Como a superf\u00edcie do filtro \u00e9 composta por superf\u00edcies convexas e c\u00f4ncavas extremamente pequenas, ela promove a adsor\u00e7\u00e3o eletrost\u00e1tica e a intercepta\u00e7\u00e3o por ader\u00eancia das inclus\u00f5es.<\/p>\n<p>Quando o metal fundido flui atrav\u00e9s do filtro de cer\u00e2mica espumosa, ele se divide em correntes compostas por muitas pequenas unidades, cujo di\u00e2metro \u00e9 reduzido, e o fluxo tende a ser laminar. Quando o metal fundido se encontra em um estado de fluxo laminar, como sua densidade \u00e9 muito maior do que a das inclus\u00f5es, estas t\u00eam tempo suficiente para flutuar e serem removidas; ou seja, o filtro cer\u00e2mico de espuma auxilia o canal transversal a reter a esc\u00f3ria. Depois que o filtro \u00e9 colocado no sistema de canaliza\u00e7\u00e3o, a for\u00e7a auxiliar para o fluxo do metal fundido \u00e9 aumentada, e o metal fundido que flui no canal de alimenta\u00e7\u00e3o forma facilmente um movimento completo, e a vaz\u00e3o \u00e9 reduzida, o que favorece a flutua\u00e7\u00e3o das inclus\u00f5es e sua perman\u00eancia na parte superior do canal de alimenta\u00e7\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"<p>Ceramic filter filtration efficiency main factors are filtration accuracy and filtration rate. Filtration accuracy refers to the size of the smallest solid particles in the&hellip;<\/p>","protected":false},"author":1,"featured_media":4895,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[4181,1778,4128,1749,1744,1455,1774,1745,1451,4702,1438,1757,1753,21,1743,427,219,1740,425,1741,1742,1747,1729,165,1781,1737,1782,1739,1780,1746],"class_list":["post-4894","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-30-ppi-foam-filter","tag-alumina-ceramic-foam-filters","tag-alumina-foam-ceramic-filters","tag-aluminum-melt-filtering-devices","tag-asian-foundry-filter","tag-asian-foundry-filters","tag-cast-filters","tag-casting-filters-for-molten-aluminum","tag-ceramic-disc-filter","tag-ceramic-filter-filtration","tag-ceramic-filter-suppliers","tag-ceramic-filters","tag-ceramic-filters-for-foundry","tag-ceramic-foam-filter","tag-ceramic-foam-filter-canada","tag-ceramic-foam-filter-manufacturers","tag-ceramic-foam-filter-suppliers","tag-ceramic-foam-filter-with-fiber","tag-ceramic-foam-filters-for-casting","tag-ceramic-foam-filters-producers","tag-ceramic-foam-filters-sizing","tag-deep-bed-filter","tag-foam-ceramic-filters","tag-foam-filter-manufacturers","tag-foam-furnace-filters","tag-foundry-ceramic-foam-filter","tag-metal-foam-filters","tag-molten-metal-ceramic-foam-filter","tag-porous-ceramic-filters","tag-use-of-molten-aluminum-filter"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ceramic Filter Filtration of Purifying the Molten Metal<\/title>\n<meta name=\"description\" content=\"Ceramic filter filtration efficiency main factors are filtration accuracy and filtration rate. 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