{"id":8507,"date":"2021-04-23T05:42:07","date_gmt":"2021-04-23T05:42:07","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=8507"},"modified":"2021-04-23T05:42:07","modified_gmt":"2021-04-23T05:42:07","slug":"aluminum-degassing-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminum-degassing-refining\/","title":{"rendered":"Desgaseifica\u00e7\u00e3o e refino de alum\u00ednio"},"content":{"rendered":"

No processo de refino por desgaseifica\u00e7\u00e3o de ligas de alum\u00ednio e metais n\u00e3o ferrosos, \u00e9 comum que sejam geradas inclus\u00f5es n\u00e3o met\u00e1licas, como \u00f3xidos, e que o hidrog\u00eanio se misture ao metal fundido. Portanto, somente quando as inclus\u00f5es n\u00e3o met\u00e1licas s\u00e3o separadas ou removidas do metal fundido antes do processamento \u00e9 que se consegue obter um produto final de alta qualidade. Al\u00e9m disso, ao introduzir no molde metal fundido contendo um g\u00e1s s\u00f3lido dissolvido \u2014 composto principalmente por hidrog\u00eanio \u2014, pequenas cavidades chamadas de \u201cpinholes\u201d podem ser geradas ap\u00f3s a solidifica\u00e7\u00e3o, resultando em uma diminui\u00e7\u00e3o na densidade do produto acabado. Al\u00e9m disso, a presen\u00e7a de inclus\u00f5es ligadas ao g\u00e1s pode causar v\u00e1rios defeitos no produto ap\u00f3s o processamento.<\/p>\n

Tendo em vista o exposto, antes da opera\u00e7\u00e3o de fundi\u00e7\u00e3o de metais n\u00e3o ferrosos, como as ligas de alum\u00ednio, o material fundido \u00e9 desgaseificado para melhorar a qualidade do metal fundido. Nessa opera\u00e7\u00e3o de refinamento por desgaseifica\u00e7\u00e3o, um grande n\u00famero de pequenas bolhas de g\u00e1s inerte, como arg\u00f4nio ou nitrog\u00eanio, \u00e9 injetado no metal fundido, de modo que o g\u00e1s dissolvido no estado s\u00f3lido e as inclus\u00f5es n\u00e3o met\u00e1licas sejam retidos ou capturados pelas bolhas de g\u00e1s inerte e flutuem para serem removidos.<\/p>\n

\"Unidades<\/p>\n

O unidade de desgaseifica\u00e7\u00e3o<\/a> O dispositivo de desgaseifica\u00e7\u00e3o para fundi\u00e7\u00e3o cont\u00ednua de alum\u00ednio \u00e9 posicionado entre o forno de reten\u00e7\u00e3o e a m\u00e1quina de fundi\u00e7\u00e3o, ao longo da linha de processamento do metal fundido. O dispositivo de desgaseifica\u00e7\u00e3o recebe continuamente metal fundido pela entrada. A abertura superior do recipiente de desgaseifica\u00e7\u00e3o \u00e9 coberta por uma tampa e, no lado a jusante, a divis\u00f3ria se estende para baixo em uma dire\u00e7\u00e3o transversal ao fluxo do fluido. Ela \u00e9 utilizada para impedir que metais, incluindo \u00f3xidos e outros objetos flutuantes, sejam levados para o processo de tratamento subsequente.<\/p>\n

O tempo de perman\u00eancia do metal fundido na c\u00e2mara de processamento a montante da divis\u00f3ria pode prolongar a dura\u00e7\u00e3o da opera\u00e7\u00e3o de desgaseifica\u00e7\u00e3o. O dispositivo rotativo de difus\u00e3o de g\u00e1s \u00e9 inserido atrav\u00e9s do orif\u00edcio na tampa e fica localizado no metal fundido dentro do recipiente de desgaseifica\u00e7\u00e3o. A parte inferior do dispositivo de difus\u00e3o de g\u00e1s est\u00e1 imersa no metal fundido e, ao mesmo tempo, situa-se na parte inferior. Por meio do movimento rotativo, o g\u00e1s inerte \u00e9 ejetado da parte inferior do dispositivo de difus\u00e3o de g\u00e1s, e o g\u00e1s inerte, na forma de bolhas finas, difunde-se no metal fundido simultaneamente.<\/p>\n

Al\u00e9m do processo de refinamento por desgaseifica\u00e7\u00e3o do alum\u00ednio descrito acima, \u00e9 necess\u00e1rio um queimador para aquecer o metal no recipiente, a fim de aquecer o metal que permanece no recipiente. Caso contr\u00e1rio, o metal remanescente no recipiente come\u00e7a a se solidificar, o que dificulta que ele se funda uniformemente com o metal rec\u00e9m-introduzido. Al\u00e9m disso, quando s\u00e3o necess\u00e1rios trabalhos de manuten\u00e7\u00e3o no recipiente de desgaseifica\u00e7\u00e3o, a opera\u00e7\u00e3o do queimador \u00e9 essencial para remover o metal fundido remanescente no recipiente.<\/p>","protected":false},"excerpt":{"rendered":"

In the degassing refining process of aluminum alloy and non-ferrous metals, it often happens that non-metallic inclusions such as oxides are generated and hydrogen is…<\/p>","protected":false},"author":1,"featured_media":8509,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-8507","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nAluminum Degassing Refining with Degassing Unit<\/title>\n<meta name=\"description\" content=\"Before the casting operation of aluminum alloy metals, the degassing refining process to improve the quality of the molten metal.\" \/>\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\/aluminum-degassing-refining\/\" \/>\n<meta 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