{"id":2881,"date":"2020-07-16T09:44:10","date_gmt":"2020-07-16T09:44:10","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=2881"},"modified":"2020-08-03T07:58:04","modified_gmt":"2020-08-03T07:58:04","slug":"remove-impurities-in-alloy","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/remove-impurities-in-alloy\/","title":{"rendered":"Remover impurezas da liga"},"content":{"rendered":"<p>No caso de inclus\u00f5es n\u00e3o met\u00e1licas, o uso de m\u00e9todos de refino a g\u00e1s permite a remo\u00e7\u00e3o eficaz dessas impurezas. Para materiais mais exigentes, o m\u00e9todo de filtra\u00e7\u00e3o CFF consegue remover as impurezas da liga por meio de filtra\u00e7\u00e3o mec\u00e2nica atrav\u00e9s da camada de alum\u00ednio fundido.<\/p>\n<p>No caso das impurezas met\u00e1licas, o m\u00e9todo geral de tratamento consiste em transformar fatores prejudiciais em fatores favor\u00e1veis. Ou seja, elas s\u00e3o convertidas em uma segunda fase ben\u00e9fica por meio do m\u00e9todo de liga, a fim de melhorar o desempenho do material. Caso seja necess\u00e1rio remov\u00ea-las, na maioria dos casos, utiliza-se a diferen\u00e7a de pontos de ebuli\u00e7\u00e3o entre os diversos elementos para realizar uma destila\u00e7\u00e3o seletiva em alta temperatura e baixa press\u00e3o, a fim de alcan\u00e7ar o objetivo de remo\u00e7\u00e3o das impurezas met\u00e1licas.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-2797\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/07\/26.jpg\" alt=\"Refinamento de sucata de alum\u00ednio\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/26.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/07\/26-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<h2>Como remover impurezas de uma liga<\/h2>\n<p>As ligas de alum\u00ednio fundidas a partir de sucatas que cont\u00eam alum\u00ednio frequentemente apresentam um excesso de elementos met\u00e1licos, os quais devem ser removidos na medida do poss\u00edvel. A oxida\u00e7\u00e3o seletiva pode ser utilizada para remover diversas impurezas met\u00e1licas da massa fundida que apresentam maior afinidade pelo oxig\u00eanio do que o alum\u00ednio. Por exemplo, magn\u00e9sio, zinco, c\u00e1lcio, zirc\u00f4nio e outros elementos podem acelerar a oxida\u00e7\u00e3o dessas impurezas por meio da agita\u00e7\u00e3o da massa fundida. Esses \u00f3xidos met\u00e1licos n\u00e3o se dissolvem no alum\u00ednio l\u00edquido e passam para a esc\u00f3ria, de modo que podem ser separados do alum\u00ednio por meio da remo\u00e7\u00e3o da esc\u00f3ria da massa fundida.<\/p>\n<p>Tamb\u00e9m \u00e9 poss\u00edvel utilizar a diferen\u00e7a de solubilidade para remover impurezas met\u00e1licas da liga. Por exemplo, a liga de alum\u00ednio contaminada com impurezas \u00e9 eut\u00e9tica com um metal capaz de dissolver bem o alum\u00ednio sem dissolver as impurezas; em seguida, o l\u00edquido da liga de alum\u00ednio \u00e9 separado por filtra\u00e7\u00e3o, e 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, esses metais s\u00e3o removidos por destila\u00e7\u00e3o a v\u00e1cuo.<\/p>\n<p>Por exemplo, ap\u00f3s a liga de alum\u00ednio contaminada com impurezas atingir o ponto eut\u00e9tico com magn\u00e9sio 30%, a liga \u00e9 mantida em repouso a uma temperatura pr\u00f3xima da temperatura eut\u00e9tica por um determinado per\u00edodo; as fases cristalinas precipitadas prim\u00e1rias, que cont\u00eam ferro e sil\u00edcio, s\u00e3o filtradas e, em seguida, submetidas a um processo de remo\u00e7\u00e3o a v\u00e1cuo a 850 \u2103 O magn\u00e9sio e as impurezas, como zinco e chumbo, que apresentam alta press\u00e3o de vapor, tamb\u00e9m s\u00e3o removidos juntamente com o magn\u00e9sio, e a liga de alum\u00ednio pura, ap\u00f3s a remo\u00e7\u00e3o do magn\u00e9sio, pode ser fundida em lingotes.<\/p>\n<p>A fim de melhorar ainda mais a qualidade do l\u00edquido da liga de alum\u00ednio, ou quando certos tipos de liga de alum\u00ednio exigem um controle rigoroso do teor de hidrog\u00eanio e das inclus\u00f5es, pode-se recorrer ao m\u00e9todo de refino combinado, ou seja, a utiliza\u00e7\u00e3o simult\u00e2nea de dois m\u00e9todos de refino. Por exemplo, o refino combinado com filtra\u00e7\u00e3o por sal de cloreto e o refino combinado com sopro de arg\u00f4nio e fluxo, <a href=\"http:\/\/www.alalloycasting.com\/pt\/on-line-purification-device-outside-the-furnace\/\">equipamentos de desgaseifica\u00e7\u00e3o e filtragem on-line<\/a> pode alcan\u00e7ar melhores resultados do que o refinamento \u00fanico.<\/p>","protected":false},"excerpt":{"rendered":"<p>For non-metallic inclusions, the use of gas refining methods can be effectively removed. For the more demanding materials, the CFF filtration method can remove impurities&hellip;<\/p>","protected":false},"author":1,"featured_media":2882,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[1458,1457],"class_list":["post-2881","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-cff-filtration-method","tag-how-to-remove-impurities-in-alloy"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Remove Impurities in Alloy,CFF Filtration Method<\/title>\n<meta name=\"description\" content=\"For the more demanding materials, the CFF filtration method can remove impurities in alloy by mechanical filtration through the molten aluminum layer.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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