{"id":6746,"date":"2020-11-27T02:53:49","date_gmt":"2020-11-27T02:53:49","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6746"},"modified":"2020-11-27T02:53:49","modified_gmt":"2020-11-27T02:53:49","slug":"molten-aluminium-purification-technology","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/molten-aluminium-purification-technology\/","title":{"rendered":"Tecnologia de purifica\u00e7\u00e3o de alum\u00ednio fundido"},"content":{"rendered":"<p>O alum\u00ednio fundido \u00e9 um l\u00edquido de alta temperatura composto por alum\u00ednio e ligas de alum\u00ednio, formado pela mistura direta de alum\u00ednio prim\u00e1rio (lingote de alum\u00ednio ou alum\u00ednio eletrol\u00edtico) com outros elementos de liga, por meio de um m\u00e9todo de fundi\u00e7\u00e3o em alta temperatura. Durante a fundi\u00e7\u00e3o do alum\u00ednio e das ligas de alum\u00ednio, ocorrem esc\u00f3ria oxidada e gettering, o que faz com que o alum\u00ednio l\u00edquido em alta temperatura seja contaminado por impurezas em graus variados. Em especial, os metais fundidos de alum\u00ednio e ligas de alum\u00ednio cont\u00eam uma grande quantidade de hidrog\u00eanio, bem como inclus\u00f5es met\u00e1licas e n\u00e3o met\u00e1licas. Se as subst\u00e2ncias nocivas acima mencionadas n\u00e3o puderem ser removidas a tempo antes da fundi\u00e7\u00e3o, defeitos de fundi\u00e7\u00e3o, como poros, inclus\u00f5es e porosidade, se formar\u00e3o no interior e na superf\u00edcie da pe\u00e7a fundida, o que afetar\u00e1 gravemente as propriedades f\u00edsicas, qu\u00edmicas, mec\u00e2nicas e diversas propriedades de processamento posterior da pe\u00e7a, resultando em uma grande quantidade de res\u00edduos. Portanto, o alum\u00ednio fundido precisa ser purificado. Atualmente, a tecnologia de purifica\u00e7\u00e3o do alum\u00ednio fundido inclui dois tipos de purifica\u00e7\u00e3o: dentro do forno e fora do forno.<\/p>\n<p>A tecnologia de purifica\u00e7\u00e3o em forno \u00e9 um tipo de tecnologia de purifica\u00e7\u00e3o de alum\u00ednio fundido adotada no forno de fus\u00e3o de alum\u00ednio durante o processo de fundi\u00e7\u00e3o de alum\u00ednio e ligas de alum\u00ednio, incluindo a desgaseifica\u00e7\u00e3o e a remo\u00e7\u00e3o de esc\u00f3ria.<\/p>\n<p><strong>A tecnologia pode ser dividida em tecnologia de tratamento de purifica\u00e7\u00e3o por adsor\u00e7\u00e3o e tecnologia de tratamento de purifica\u00e7\u00e3o sem adsor\u00e7\u00e3o:<\/strong><\/p>\n<p>O m\u00e9todo de adsor\u00e7\u00e3o baseia-se principalmente no fluxo para produzir o efeito de absor\u00e7\u00e3o de inclus\u00f5es de oxida\u00e7\u00e3o r\u00edgidas e, ao mesmo tempo, remover as inclus\u00f5es de oxida\u00e7\u00e3o e o hidrog\u00eanio adsorvido na superf\u00edcie, a fim de alcan\u00e7ar o objetivo de purificar o alum\u00ednio fundido. O efeito de purifica\u00e7\u00e3o do m\u00e9todo de adsor\u00e7\u00e3o ocorre apenas na interface de adsor\u00e7\u00e3o. O m\u00e9todo de adsor\u00e7\u00e3o inclui, principalmente, a purga com g\u00e1s \u00fanico, a purga com g\u00e1s misto, a purifica\u00e7\u00e3o com sal de cloro e o refinamento pelo m\u00e9todo do fluxo.<\/p>\n<p>O m\u00e9todo sem adsor\u00e7\u00e3o baseia-se principalmente em outros efeitos f\u00edsicos e qu\u00edmicos para atingir o objetivo de purificar o alum\u00ednio l\u00edquido. O m\u00e9todo sem adsor\u00e7\u00e3o inclui, principalmente, o tratamento de purifica\u00e7\u00e3o a v\u00e1cuo (tratamento a v\u00e1cuo est\u00e1tico, tratamento a v\u00e1cuo din\u00e2mico), o tratamento de purifica\u00e7\u00e3o por ultrassom, o tratamento de purifica\u00e7\u00e3o eletromagn\u00e9tica, o m\u00e9todo de cristaliza\u00e7\u00e3o sob press\u00e3o, o m\u00e9todo de hidrog\u00eanio s\u00f3lido com elementos de terras raras, etc.<\/p>\n<p>A tecnologia de purifica\u00e7\u00e3o do alum\u00ednio fundido (desgaseifica\u00e7\u00e3o e filtra\u00e7\u00e3o) fora do forno \u00e9 uma tecnologia de desgaseifica\u00e7\u00e3o e escoria\u00e7\u00e3o em linha utilizada no processo de fundi\u00e7\u00e3o do alum\u00ednio fundido. O m\u00e9todo de purifica\u00e7\u00e3o por desgaseifica\u00e7\u00e3o (hidrog\u00eanio) fora do forno \u00e9, na verdade, o m\u00e9todo de flota\u00e7\u00e3o por bolhas, que consiste em um determinado processo que produz um grande n\u00famero de bolhas no alum\u00ednio fundido, utilizando a diferen\u00e7a de press\u00e3o parcial entre o hidrog\u00eanio no alum\u00ednio fundido e as bolhas, de modo que o hidrog\u00eanio no alum\u00ednio fundido entre continuamente nas bolhas e flutue no alum\u00ednio fundido, escapando finalmente da superf\u00edcie do l\u00edquido junto com as bolhas. O objetivo \u00e9 a remo\u00e7\u00e3o do hidrog\u00eanio. Ao mesmo tempo, uma parte da esc\u00f3ria \u00e9 removida durante o processo de flutua\u00e7\u00e3o das bolhas, a fim de obter o efeito de separa\u00e7\u00e3o entre a esc\u00f3ria e o l\u00edquido.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6747\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/11\/Molten-Aluminium-Purification-Technology-1.jpg\" alt=\"Tecnologia de purifica\u00e7\u00e3o de alum\u00ednio fundido\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/11\/Molten-Aluminium-Purification-Technology-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/11\/Molten-Aluminium-Purification-Technology-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>No que diz respeito ao dispositivo de purifica\u00e7\u00e3o externo ao forno, o dispositivo de purifica\u00e7\u00e3o mais comumente utilizado atualmente \u00e9 o dispositivo de purifica\u00e7\u00e3o por desgaseifica\u00e7\u00e3o por inje\u00e7\u00e3o rotativa, como o dispositivo SNIF da empresa americana Pyrotek, o dispositivo Aplur da empresa francesa Novelis, o dispositivo GBF da Fujiko do Jap\u00e3o e o dispositivo de desgaseifica\u00e7\u00e3o TKR do Jap\u00e3o. O exemplo mais t\u00edpico \u00e9 o desgaseificador a v\u00e1cuo produzido pela Hydro Corporation, e <a href=\"http:\/\/www.alalloycasting.com\/pt\/online-aluminum-degassing-equipment\/\">equipamento de desgaseifica\u00e7\u00e3o online<\/a> da AdTech China.<\/p>\n<p>Embora existam muitos tipos de equipamentos de purifica\u00e7\u00e3o por desgaseifica\u00e7\u00e3o com jato rotativo, tanto no mercado nacional quanto no internacional, eles geralmente s\u00e3o instalados entre a porta de descarga do forno e a caixa de filtragem. O princ\u00edpio da desgaseifica\u00e7\u00e3o \u00e9 o seguinte: o alum\u00ednio l\u00edquido em alta temperatura passa pelo corpo da caixa de desgaseifica\u00e7\u00e3o para fluir e transitar, e em seguida gira. O rotor fragmenta o g\u00e1s inerte injetado no alum\u00ednio fundido por meio da plataforma girat\u00f3ria em um grande n\u00famero de bolhas dispersas e as espalha pelo alum\u00ednio fundido. As bolhas no alum\u00ednio l\u00edquido, aproveitando a diferen\u00e7a de press\u00e3o parcial dos gases e o princ\u00edpio da adsor\u00e7\u00e3o superficial, absorvem o hidrog\u00eanio presente no alum\u00ednio l\u00edquido, adsorvem a esc\u00f3ria oxidada e s\u00e3o removidas da superf\u00edcie do alum\u00ednio l\u00edquido \u00e0 medida que as bolhas sobem, permitindo assim a purifica\u00e7\u00e3o do alum\u00ednio l\u00edquido.<\/p>","protected":false},"excerpt":{"rendered":"<p>Molten aluminium is an alloyed aluminum and aluminum alloy high-temperature liquid formed by directly or mixing primary aluminum (aluminum ingot or electrolytic aluminum) with other&hellip;<\/p>","protected":false},"author":1,"featured_media":6748,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6746","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>Molten Aluminium Purification Technology - Degassing and Filtration<\/title>\n<meta name=\"description\" content=\"The molten aluminium purification technology outside the furnace is online degassing and filtering technology, used in the casting process.\" \/>\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\/molten-aluminium-purification-technology\/\" \/>\n<meta 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