{"id":4801,"date":"2020-09-15T09:14:01","date_gmt":"2020-09-15T09:14:01","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4801"},"modified":"2020-09-15T09:14:01","modified_gmt":"2020-09-15T09:14:01","slug":"aluminum-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminum-refining\/","title":{"rendered":"Refino de alum\u00ednio"},"content":{"rendered":"<p>No caso de inclus\u00f5es n\u00e3o met\u00e1licas na massa fundida de liga de alum\u00ednio, principalmente \u00f3xidos, o refino do alum\u00ednio pode ser utilizado para remov\u00ea-las de forma eficaz. Para materiais mais exigentes, elas tamb\u00e9m podem ser removidas por filtra\u00e7\u00e3o durante o processo de vazamento. No caso de impurezas met\u00e1licas, o m\u00e9todo geral de tratamento consiste em transformar fatores prejudiciais em fatores favor\u00e1veis. Ou seja, elas s\u00e3o transformadas em uma segunda fase ben\u00e9fica por meio do m\u00e9todo de liga, a fim de melhorar o desempenho do material e reduzir custos.<\/p>\n<p>As ligas de alum\u00ednio fundidas a partir de res\u00edduos que cont\u00eam alum\u00ednio frequentemente apresentam teores excessivos de elementos met\u00e1licos, os quais devem ser removidos na medida do poss\u00edvel. O m\u00e9todo de oxida\u00e7\u00e3o pode ser utilizado para remover diversas impurezas met\u00e1licas da massa fundida que apresentam maior afinidade pelo oxig\u00eanio do que o alum\u00ednio, bem como pelo oxig\u00eanio e pelo cloro. Por exemplo, magn\u00e9sio, zinco, c\u00e1lcio, zirc\u00f4nio, s\u00f3dio, pot\u00e1ssio e outros elementos aceleram a oxida\u00e7\u00e3o e a clora\u00e7\u00e3o dessas impurezas por meio da agita\u00e7\u00e3o da massa fundida. Esses \u00f3xidos e cloretos met\u00e1licos s\u00e3o insol\u00faveis na liga de alum\u00ednio l\u00edquida e passam para a esc\u00f3ria. Eles podem ser removidos da massa fundida da liga de alum\u00ednio por meio da remo\u00e7\u00e3o da esc\u00f3ria.<\/p>\n<p>A diferen\u00e7a de solubilidade tamb\u00e9m pode ser utilizada para remover impurezas met\u00e1licas da solu\u00e7\u00e3o de liga de alum\u00ednio. Por exemplo, a liga de alum\u00ednio contaminada por impurezas \u00e9 submetida a um processo de eutectiza\u00e7\u00e3o com um metal capaz de dissolver o alum\u00ednio sem dissolver as impurezas; em seguida, o l\u00edquido da liga de alum\u00ednio \u00e9 separado por <a href=\"http:\/\/www.alalloycasting.com\/pt\/cff-filters\/\">Filtragem CFF<\/a>, e, em seguida, o metal adicionado \u00e9 removido por destila\u00e7\u00e3o a v\u00e1cuo. Normalmente, magn\u00e9sio, zinco e merc\u00fario s\u00e3o adicionados para remover ferro, sil\u00edcio e outras impurezas do alum\u00ednio; em seguida, utiliza-se a destila\u00e7\u00e3o a v\u00e1cuo para remover esses metais adicionados. Por exemplo, ap\u00f3s a liga de alum\u00ednio contaminada por impurezas ser submetida \u00e0 eutectiza\u00e7\u00e3o com magn\u00e9sio 30%, a liga \u00e9 deixada em repouso por um per\u00edodo de tempo a uma temperatura pr\u00f3xima da temperatura eut\u00e9tica para filtrar as fases cristalinas precipitadas prim\u00e1rias contendo ferro e sil\u00edcio, e, em seguida, \u00e9 realizada a dessor\u00e7\u00e3o a v\u00e1cuo a 850 \u00b0C. O magn\u00e9sio e as impurezas com alta press\u00e3o de vapor, como zinco e chumbo, tamb\u00e9m s\u00e3o removidos juntamente com o magn\u00e9sio, obtendo-se uma liga de alum\u00ednio pura ap\u00f3s a remo\u00e7\u00e3o do magn\u00e9sio. Em circunst\u00e2ncias normais, esse processo n\u00e3o \u00e9 adotado pela ind\u00fastria secund\u00e1ria de alum\u00ednio, pois seu custo \u00e9 muito alto.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4802\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminum-Refining-1.jpg\" alt=\"Refino de alum\u00ednio\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminum-Refining-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminum-Refining-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>A fim de melhorar ainda mais a qualidade do l\u00edquido de liga de alum\u00ednio, ou quando certos tipos de ligas de alum\u00ednio exigem um controle rigoroso do teor de hidrog\u00eanio e das inclus\u00f5es, podem ser utilizados m\u00e9todos combinados de refino, ou seja, dois m\u00e9todos de refino s\u00e3o empregados simultaneamente. Por exemplo, refino com sal de cloro + filtra\u00e7\u00e3o, sopro de arg\u00f4nio + <a href=\"http:\/\/www.alalloycasting.com\/pt\/flux-refining\/\">refinamento por fluxo<\/a> e outros m\u00e9todos podem alcan\u00e7ar melhores resultados do que a refina\u00e7\u00e3o exclusiva do alum\u00ednio.<\/p>\n<p>Em compara\u00e7\u00e3o com a produ\u00e7\u00e3o de lingotes a partir de lingotes de alum\u00ednio destinados \u00e0 refundi\u00e7\u00e3o, o teor de hidrog\u00eanio, inclus\u00f5es n\u00e3o met\u00e1licas e impurezas de metais diferentes do alum\u00ednio na massa fundida de alum\u00ednio reciclado \u00e9 muito mais elevado do que o encontrado nas massas fundidas de alum\u00ednio e ligas produzidas a partir da refundi\u00e7\u00e3o de lingotes de alum\u00ednio. Se n\u00e3o for refinado, \u00e9 dif\u00edcil garantir a qualidade dos lingotes de alum\u00ednio reciclado. O m\u00e9todo para remo\u00e7\u00e3o de hidrog\u00eanio e inclus\u00f5es n\u00e3o met\u00e1licas da massa fundida de alum\u00ednio secund\u00e1rio \u00e9 basicamente o mesmo que o m\u00e9todo para a produ\u00e7\u00e3o da massa fundida de lingotes a partir de lingotes refundidos.<\/p>","protected":false},"excerpt":{"rendered":"<p>For non-metallic inclusions in aluminum alloy melt, mainly oxides, aluminum refining can be used to effectively remove them. For more demanding materials, it can also&hellip;<\/p>","protected":false},"author":1,"featured_media":4803,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4689,240],"class_list":["post-4801","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-refining","tag-flux-refining"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Aluminum Refining by Flux | Gas Refining for Molten Aluminum<\/title>\n<meta name=\"description\" content=\"For non-metallic inclusions in aluminum alloy melt, mainly oxides, aluminum refining can be used to effectively remove them.\" \/>\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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