{"id":2715,"date":"2020-07-09T10:18:06","date_gmt":"2020-07-09T10:18:06","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=2715"},"modified":"2020-07-15T01:21:17","modified_gmt":"2020-07-15T01:21:17","slug":"liquid-aluminium-purification","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/liquid-aluminium-purification\/","title":{"rendered":"Purifica\u00e7\u00e3o de alum\u00ednio l\u00edquido"},"content":{"rendered":"<p>O alum\u00ednio l\u00edquido retirado da c\u00e9lula eletrol\u00edtica de alum\u00ednio cont\u00e9m muitas impurezas, o que n\u00e3o s\u00f3 afeta o desempenho da fundi\u00e7\u00e3o e do processamento do alum\u00ednio met\u00e1lico, mas tamb\u00e9m prejudica a qualidade do produto. Al\u00e9m dos elementos met\u00e1licos impuros que acompanham a precipita\u00e7\u00e3o do alum\u00ednio durante o processo de eletr\u00f3lise, h\u00e1 impurezas s\u00f3lidas n\u00e3o met\u00e1licas (como \u00f3xidos, carbonetos, nitretos etc.) e gases dissolvidos (como H\u2082, CO\u2082, CO, CH\u2084 e N\u2082 etc.). 100 g de alum\u00ednio l\u00edquido dissolvem cerca de 0,2 a 0,4 cm\u00b3 de hidrog\u00eanio a uma temperatura de 1.273 K. Existem duas formas de hidrog\u00eanio no alum\u00ednio l\u00edquido: o hidrog\u00eanio at\u00f4mico e o hidrog\u00eanio gasoso. O primeiro est\u00e1 dissolvido no alum\u00ednio l\u00edquido, e o segundo \u00e9 geralmente adsorvido nas part\u00edculas s\u00f3lidas de inclus\u00e3o e deve ser removido antes da fundi\u00e7\u00e3o do lingote. Quando o alum\u00ednio l\u00edquido original \u00e9 fundido diretamente em v\u00e1rios tarugos, os requisitos para a purifica\u00e7\u00e3o do alum\u00ednio l\u00edquido s\u00e3o mais rigorosos, pois os poros e as inclus\u00f5es de esc\u00f3ria no tarugo se tornar\u00e3o diretamente defeitos nos produtos processados.<\/p>\n<h2>Purifica\u00e7\u00e3o de alum\u00ednio l\u00edquido<\/h2>\n<p>Os m\u00e9todos de purifica\u00e7\u00e3o do alum\u00ednio l\u00edquido comumente utilizados s\u00e3o o m\u00e9todo de purifica\u00e7\u00e3o por filtragem e o m\u00e9todo de purifica\u00e7\u00e3o por g\u00e1s, ou uma combina\u00e7\u00e3o cont\u00ednua dos dois <a href=\"http:\/\/www.alalloycasting.com\/pt\/aluminum-water-purification-method\/\">m\u00e9todo de purifica\u00e7\u00e3o<\/a> fora do forno. Al\u00e9m disso, h\u00e1 aqueles que utilizam <a href=\"http:\/\/www.alalloycasting.com\/pt\/flux-for-melting-aluminum\/\">purifica\u00e7\u00e3o do fluxo<\/a>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2377\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/06\/4-1.jpg\" alt=\"Tecnologia de fundi\u00e7\u00e3o de lingotes de alum\u00ednio\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/06\/4-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/06\/4-1-300x240.jpg 300w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/06\/4-1-125x100.jpg 125w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>M\u00e9todo de filtra\u00e7\u00e3o e purifica\u00e7\u00e3o: um m\u00e9todo para purificar inclus\u00f5es n\u00e3o met\u00e1licas no alum\u00ednio l\u00edquido com o <a href=\"http:\/\/www.alalloycasting.com\/pt\/ceramic-foam-filter-for-casting\/\">filtro de espuma cer\u00e2mica<\/a> meio filtrante. O meio filtrante pode consistir em esferas de corindo, chapas de cer\u00e2mica espumada, tubos cer\u00e2micos microporosos, camadas de carbono e filtros de seda de silicato fabricados em alta temperatura.<\/p>\n<p>O m\u00e9todo de purifica\u00e7\u00e3o por g\u00e1s \u00e9 um m\u00e9todo no qual bolhas de g\u00e1s inerte ou g\u00e1s ativo s\u00e3o introduzidas no alum\u00ednio l\u00edquido para dissolver o g\u00e1s dissolvido. Podem ser utilizados gases inertes, como nitrog\u00eanio e arg\u00f4nio, bem como gases ativos, como cloro, tetracloreto de carbono e hexacloroetano. Ao utilizar g\u00e1s cloro, as bolhas de cloro formam bolhas dispersas de cloreto de alum\u00ednio no alum\u00ednio l\u00edquido, ret\u00eam as inclus\u00f5es s\u00f3lidas em suspens\u00e3o adsorvidas pelo hidrog\u00eanio e, em seguida, flutuam at\u00e9 a superf\u00edcie do alum\u00ednio l\u00edquido para serem removidas. Ao mesmo tempo, impurezas met\u00e1licas como l\u00edtio, pot\u00e1ssio, c\u00e1lcio, s\u00f3dio e magn\u00e9sio contidas no alum\u00ednio l\u00edquido podem ser removidas por meio da clora\u00e7\u00e3o. No entanto, o cloro \u00e9 corrosivo e causa perda de alum\u00ednio e polui\u00e7\u00e3o ambiental; por isso, \u00e9 usado principalmente em combina\u00e7\u00e3o com nitrog\u00eanio. O teor de cloro \u00e9 geralmente de 3% a 6% (fra\u00e7\u00e3o volum\u00e9trica). Al\u00e9m disso, a fim de reduzir a quantidade de cloreto de alum\u00ednio descarregada na atmosfera, pode-se utilizar o m\u00e9todo de espalhar fluxo de cloreto na superf\u00edcie do alum\u00ednio para reduzir o teor de s\u00f3dio no alum\u00ednio a menos de 0,001%. Esse l\u00edquido com baixo teor de s\u00f3dio pode ser utilizado na produ\u00e7\u00e3o de ligas de alum\u00ednio-magn\u00e9sio para deforma\u00e7\u00e3o.<\/p>\n<h2>Filtragem e purifica\u00e7\u00e3o de gases<\/h2>\n<p>O m\u00e9todo consiste em combinar a purifica\u00e7\u00e3o cont\u00ednua fora do forno com filtragem e purifica\u00e7\u00e3o a g\u00e1s. O alum\u00ednio l\u00edquido \u00e9 alimentado continuamente no dispositivo de purifica\u00e7\u00e3o, sob a prote\u00e7\u00e3o da camada de cobertura de fluxo, e lavado com nitrog\u00eanio (ou g\u00e1s misto). Em seguida, ap\u00f3s passar pela camada de filtro de esferas de corindo, o alum\u00ednio l\u00edquido purificado \u00e9 descarregado pela sa\u00edda. A vantagem desse m\u00e9todo \u00e9 que ele permite a purifica\u00e7\u00e3o cont\u00ednua do alum\u00ednio l\u00edquido (200-600 kg por minuto); o nitrog\u00eanio n\u00e3o causa polui\u00e7\u00e3o ao meio ambiente e apresenta um melhor efeito de purifica\u00e7\u00e3o, sendo que a taxa de remo\u00e7\u00e3o de hidrog\u00eanio pode atingir 30%-40%.<\/p>\n<p>O m\u00e9todo de purifica\u00e7\u00e3o por fundente pode ser utilizado em uma f\u00e1brica ou oficina de fundi\u00e7\u00e3o de alum\u00ednio de pequena escala para o refinamento com g\u00e1s misto de nitrog\u00eanio e cloro no forno de fus\u00e3o, ou para o refinamento com agente refinador e fundente no forno. Ao realizar a fundi\u00e7\u00e3o externamente, as inclus\u00f5es s\u00e3o removidas por meio da tela filtrante, e o resultado tamb\u00e9m \u00e9 muito bom. O fluxo utilizado \u00e9 geralmente uma mistura de nitrato de s\u00f3dio e grafite, que aproveita a decomposi\u00e7\u00e3o t\u00e9rmica do nitrato de s\u00f3dio e a rea\u00e7\u00e3o com o alum\u00ednio para formar \u00f3xidos de nitrog\u00eanio ou g\u00e1s nitrog\u00eanio, a fim de alcan\u00e7ar o objetivo de remover as impurezas gasosas.<\/p>","protected":false},"excerpt":{"rendered":"<p>The aluminum liquid removed from the aluminum electrolytic cell contains many impurities, which not only affects the casting and processing performance of metal aluminum, but&hellip;<\/p>","protected":false},"author":1,"featured_media":2821,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[823,19,822],"class_list":["post-2715","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-cff-filterer-box","tag-degassing-unit","tag-liquid-aluminium-purification"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Liquid Aluminium Purification,CFF Filterer Box,Degassing Unit<\/title>\n<meta name=\"description\" content=\"Liquid Aluminium Purification: The method of combining the continuous purification method outside the furnace with filtration and gas purification.\" \/>\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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