{"id":4392,"date":"2020-08-31T09:08:49","date_gmt":"2020-08-31T09:08:49","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4392"},"modified":"2020-08-31T09:08:49","modified_gmt":"2020-08-31T09:08:49","slug":"aluminum-rod-casting-purification","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminum-rod-casting-purification\/","title":{"rendered":"Purifica\u00e7\u00e3o na fundi\u00e7\u00e3o de barras de alum\u00ednio"},"content":{"rendered":"<p>Os m\u00e9todos de purifica\u00e7\u00e3o utilizados na fundi\u00e7\u00e3o de barras de alum\u00ednio, como clarifica\u00e7\u00e3o, fluxo e g\u00e1s, s\u00e3o os mais comuns, al\u00e9m dos m\u00e9todos de filtra\u00e7\u00e3o. O alum\u00ednio l\u00edquido aspirado da c\u00e9lula eletrol\u00edtica pela barra de alum\u00ednio 6061 cont\u00e9m diversas impurezas, por isso precisa ser purificado antes da fundi\u00e7\u00e3o.<\/p>\n<h2>Purifica\u00e7\u00e3o na fundi\u00e7\u00e3o de barras de alum\u00ednio<\/h2>\n<p><strong>Purifica\u00e7\u00e3o do fluxo<\/strong><\/p>\n<p>A purifica\u00e7\u00e3o do fluxo consiste em utilizar o <a href=\"http:\/\/www.alalloycasting.com\/pt\/fluxes\/\">fluxos<\/a> adicionado ao alum\u00ednio l\u00edquido para formar um grande n\u00famero de got\u00edculas finas, de modo que os \u00f3xidos presentes no alum\u00ednio l\u00edquido sejam umedecidos, absorvidos e dissolvidos por essas got\u00edculas, formando novas got\u00edculas que sobem \u00e0 superf\u00edcie e formam uma esc\u00f3ria ap\u00f3s o resfriamento. A esc\u00f3ria \u00e9 removida. O fundente utilizado para a purifica\u00e7\u00e3o \u00e9 composto por sal com baixo ponto de fus\u00e3o, baixa densidade, baixa tens\u00e3o superficial, alta atividade e forte capacidade de adsor\u00e7\u00e3o de esc\u00f3ria de oxida\u00e7\u00e3o. Ao utiliz\u00e1-lo, coloque primeiro um pequeno peda\u00e7o de fundente na gaiola de ferro, em seguida, insira-a no fundo do forno de mistura e agite-a para frente e para tr\u00e1s. Ap\u00f3s o t\u00e9rmino da a\u00e7\u00e3o do fluxo, retire a gaiola de ferro e deixe repousar por 5 a 10 minutos. Remova a esc\u00f3ria superficial e proceda \u00e0 fundi\u00e7\u00e3o. Se necess\u00e1rio, o fluxo tamb\u00e9m pode ser removido da superf\u00edcie para cobri-la.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4394\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/08\/Aluminum-Rod-Casting-Purification-1.jpg\" alt=\"Purifica\u00e7\u00e3o na fundi\u00e7\u00e3o de barras de alum\u00ednio\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/08\/Aluminum-Rod-Casting-Purification-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/08\/Aluminum-Rod-Casting-Purification-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p><strong>Purifica\u00e7\u00e3o de g\u00e1s<\/strong><\/p>\n<p>A purifica\u00e7\u00e3o por g\u00e1s \u00e9 um dos principais m\u00e9todos de purifica\u00e7\u00e3o das barras de alum\u00ednio 6061. O g\u00e1s utilizado \u00e9 o cloro, o nitrog\u00eanio ou uma mistura de cloro e nitrog\u00eanio.<\/p>\n<p>(1) Purifica\u00e7\u00e3o com cloro. No passado, o cloro gasoso ativo era utilizado como agente purificador (m\u00e9todo de clora\u00e7\u00e3o). No m\u00e9todo de clora\u00e7\u00e3o, quando o cloro \u00e9 introduzido no alum\u00ednio fundido, s\u00e3o geradas grandes quantidades de AlCl\u2083 com granulometria anormalmente fina e bolhas, que se misturam completamente ao alum\u00ednio fundido. O hidrog\u00eanio dissolvido no alum\u00ednio fundido e algumas inclus\u00f5es mec\u00e2nicas s\u00e3o adsorvidos nas bolhas de AlCl\u2083 e s\u00e3o eliminados \u00e0 medida que as bolhas de AlCl\u2083 sobem \u00e0 superf\u00edcie do alum\u00ednio fundido. Quando o g\u00e1s cloro \u00e9 introduzido, alguns elementos com potencial de oxida\u00e7\u00e3o mais negativo do que as barras de alum\u00ednio 6061 podem ser clorados, como c\u00e1lcio, s\u00f3dio, magn\u00e9sio etc., que s\u00e3o separados em cloretos correspondentes devido \u00e0 introdu\u00e7\u00e3o do g\u00e1s cloro. Portanto, o m\u00e9todo de clora\u00e7\u00e3o \u00e9 um m\u00e9todo muito eficaz de purifica\u00e7\u00e3o do alum\u00ednio prim\u00e1rio. A quantidade de cloro utilizada \u00e9 de 500 a 700 g por tonelada de alum\u00ednio. Por\u00e9m, como o oxig\u00eanio \u00e9 t\u00f3xico e caro, a fim de evitar a polui\u00e7\u00e3o do ar e reduzir o custo da produ\u00e7\u00e3o de lingotes de alum\u00ednio, a ind\u00fastria moderna do alum\u00ednio tem gradualmente abandonado o m\u00e9todo de clora\u00e7\u00e3o e substitu\u00eddo-o pelo uso de g\u00e1s inerte \u2014 \u2013<a href=\"http:\/\/www.alalloycasting.com\/pt\/degassing-with-nitrogen\/\">Purifica\u00e7\u00e3o de nitrog\u00eanio<\/a> m\u00e9todo.<\/p>\n<p>(2) M\u00e9todo de purifica\u00e7\u00e3o com nitrog\u00eanio. Tamb\u00e9m conhecido como m\u00e9todo de purifica\u00e7\u00e3o cont\u00ednua sem fuma\u00e7a, utiliza-se esferas de alumina (418 mm) como meio filtrante. O N\u2082 \u00e9 introduzido diretamente no alum\u00ednio fundido. O alum\u00ednio fundido \u00e9 alimentado continuamente no forno de purifica\u00e7\u00e3o, passa pela camada filtrante de esferas de alumina e \u00e9 lavado com nitrog\u00eanio, de modo que as inclus\u00f5es n\u00e3o met\u00e1licas e o hidrog\u00eanio dissolvido no alum\u00ednio fundido s\u00e3o removidos; em seguida, \u00e9 descarregado continuamente, de forma que as finas bolhas de nitrog\u00eanio sejam distribu\u00eddas uniformemente, exercendo um efeito purificador no alum\u00ednio l\u00edquido tratado. O nitrog\u00eanio n\u00e3o polui a atmosfera e possui grande capacidade de purifica\u00e7\u00e3o. Ele pode processar de 200 a 600 kg de alum\u00ednio l\u00edquido por minuto, e a perda de alum\u00ednio causada pelo processo de purifica\u00e7\u00e3o \u00e9 relativamente reduzida, por isso \u00e9 amplamente utilizado atualmente. No entanto, n\u00e3o \u00e9 t\u00e3o eficaz na remo\u00e7\u00e3o de c\u00e1lcio, s\u00f3dio e magn\u00e9sio do alum\u00ednio fundido quanto o g\u00e1s cloro.<\/p>\n<p>(3) M\u00e9todo de purifica\u00e7\u00e3o com g\u00e1s misto. Utiliza-se uma mistura de cloro e nitrog\u00eanio para purificar o alum\u00ednio fundido. A fun\u00e7\u00e3o das barras de alum\u00ednio 6061 \u00e9, por um lado, remover o hidrog\u00eanio e separar os \u00f3xidos e, por outro, remover algumas impurezas met\u00e1licas (como o magn\u00e9sio) presentes no alum\u00ednio. A composi\u00e7\u00e3o comumente utilizada \u00e9 90% de nitrog\u00eanio + 10 % de cloro. H\u00e1 tamb\u00e9m a composi\u00e7\u00e3o de 10% de cloro + 10% de di\u00f3xido de carbono + 80% de nitrog\u00eanio. Esse m\u00e9todo apresenta melhores resultados, pois o di\u00f3xido de carbono difunde bem o cloro e o nitrog\u00eanio, o que pode reduzir o tempo de opera\u00e7\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"<p>Aluminum rod casting purification methods such as clarification, flux, and gas are mainly used, and filtration methods are also used. The aluminum liquid sucked from&hellip;<\/p>","protected":false},"author":1,"featured_media":4393,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4629],"class_list":["post-4392","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-rod-casting-purification"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Aluminum Rod Casting Purification by Flux and Gas Purification<\/title>\n<meta name=\"description\" content=\"Aluminum rod casting purification methods such as clarification, flux, and gas are mainly used, and filtration methods are also used.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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