{"id":5072,"date":"2020-09-25T05:37:09","date_gmt":"2020-09-25T05:37:09","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5072"},"modified":"2020-09-25T06:37:51","modified_gmt":"2020-09-25T06:37:51","slug":"impurity-removal","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/impurity-removal\/","title":{"rendered":"Remo\u00e7\u00e3o de impurezas"},"content":{"rendered":"<p>A remo\u00e7\u00e3o de impurezas \u00e9 uma etapa importante no processo de fundi\u00e7\u00e3o de alum\u00ednio. Mais de 90% das inclus\u00f5es n\u00e3o met\u00e1licas nas ligas de alum\u00ednio s\u00e3o inclus\u00f5es de alumina, incluindo a pel\u00edcula de \u00f3xido na superf\u00edcie dos lingotes de alum\u00ednio ou da sucata de alum\u00ednio utilizada como carga do forno, bem como a oxida\u00e7\u00e3o do alum\u00ednio durante o processo de fundi\u00e7\u00e3o. Outras inclus\u00f5es de \u00f3xido s\u00e3o, principalmente, \u00f3xidos produzidos pela redu\u00e7\u00e3o do material de revestimento pelo alum\u00ednio, al\u00e9m de cloretos, nitretos e carbonetos gerados durante a purifica\u00e7\u00e3o do alum\u00ednio fundido.<\/p>\n<p>O processo de purifica\u00e7\u00e3o para remo\u00e7\u00e3o de impurezas da liga de alum\u00ednio \u00e9 dividido em duas etapas: refino em forno e refino em linha. Existem tr\u00eas m\u00e9todos para remover inclus\u00f5es gasosas: o m\u00e9todo de difus\u00e3o de g\u00e1s inerte, o m\u00e9todo de purifica\u00e7\u00e3o com g\u00e1s misto de cloro e o m\u00e9todo de refino com jato de fluxo e g\u00e1s inerte. Os m\u00e9todos para remover inclus\u00f5es n\u00e3o met\u00e1licas incluem, principalmente, a filtra\u00e7\u00e3o por meio filtrante, a adsor\u00e7\u00e3o e a dissolu\u00e7\u00e3o. Os m\u00e9todos de filtra\u00e7\u00e3o por meio filtrante incluem a filtra\u00e7\u00e3o por tecido de vidro, <a href=\"http:\/\/www.alalloycasting.com\/pt\/foam-ceramic-filter-use\/\">filtro cer\u00e2mico de espuma<\/a> filtra\u00e7\u00e3o por placas, filtro tubular e filtra\u00e7\u00e3o por esferas de alumina. Devido ao mecanismo associado ao g\u00e1s de esc\u00f3ria e ao princ\u00edpio da adsor\u00e7\u00e3o por tens\u00e3o, algumas part\u00edculas finas de inclus\u00f5es n\u00e3o met\u00e1licas tamb\u00e9m podem ser removidas durante o processo de desgaseifica\u00e7\u00e3o com g\u00e1s inerte. A criolita presente no fluxo de refino pode dissolver o Al\u2082O\u2083, extrair o alum\u00ednio fundido e, ainda, alcan\u00e7ar o objetivo de remo\u00e7\u00e3o de impurezas.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5134\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Impurity-Removal-1.jpg\" alt=\"Remo\u00e7\u00e3o de impurezas\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Impurity-Removal-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Impurity-Removal-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>A AdTech resolve especificamente o problema das impurezas no alum\u00ednio l\u00edquido. A AdTech oferece <a href=\"http:\/\/www.alalloycasting.com\/pt\/refining-flux\/\">fluxo de refino<\/a>, unidade de desgaseifica\u00e7\u00e3o, filtro de espuma cer\u00e2mica e unidade de filtragem CFF para remo\u00e7\u00e3o de impurezas. Os equipamentos de desgaseifica\u00e7\u00e3o e filtragem em linha fabricados pela AdTech s\u00e3o instalados entre o forno e a m\u00e1quina de fundi\u00e7\u00e3o, a fim de eliminar o hidrog\u00eanio e outros res\u00edduos contidos no alum\u00ednio fundido e em suas ligas que afetam sua qualidade e propriedades mec\u00e2nicas.<\/p>\n<p>O filtro de espuma cer\u00e2mica \u00e9 capaz de reter com efic\u00e1cia as inclus\u00f5es de metal l\u00edquido e purificar o metal fundido. No que diz respeito \u00e0 pesquisa sobre o mecanismo de filtragem e purifica\u00e7\u00e3o de metais, destacam-se principalmente os seguintes pontos de vista: mecanismo de filtragem por peneiramento-bolo-leito profundo; mecanismo de separa\u00e7\u00e3o por flutua\u00e7\u00e3o; mecanismo de adsor\u00e7\u00e3o e mecanismo de retifica\u00e7\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"<p>Impurity removal is an important step for aluminum casting process. More than 90% of the non-metallic inclusions in aluminum alloys are alumina inclusions, including the&hellip;<\/p>","protected":false},"author":1,"featured_media":5133,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5072","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Impurity Removal in Aluminum Alloy Casting Process<\/title>\n<meta name=\"description\" content=\"Impurity removal is an important step for aluminum casting. More than 90% of the non-metallic inclusions in aluminum are alumina inclusions\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/pt\/impurity-removal\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Impurity Removal in Aluminum Alloy Casting Process\" \/>\n<meta property=\"og:description\" content=\"Impurity removal is an important step for aluminum casting. 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