{"id":2285,"date":"2020-06-16T08:57:26","date_gmt":"2020-06-16T08:57:26","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=2285"},"modified":"2020-09-15T05:51:42","modified_gmt":"2020-09-15T05:51:42","slug":"degassing-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/degassing-refining\/","title":{"rendered":"Desgaseifica\u00e7\u00e3o e Refino"},"content":{"rendered":"

Para obter o alum\u00ednio fundido com baixo teor de g\u00e1s, por um lado, \u00e9 necess\u00e1rio preparar cuidadosamente os materiais, controlar rigorosamente a temperatura, realizar a fus\u00e3o rapidamente e adotar medidas para reduzir a absor\u00e7\u00e3o de g\u00e1s, como o uso de um agente de cobertura. Por outro lado, \u00e9 necess\u00e1rio realizar um refinamento de desgaseifica\u00e7\u00e3o eficaz na fase final da fundi\u00e7\u00e3o, de modo a reduzir o g\u00e1s dissolvido no metal ao n\u00edvel mais baixo poss\u00edvel. Existem tr\u00eas maneiras de remover o g\u00e1s do metal: primeiro, os \u00e1tomos de g\u00e1s se difundem para a superf\u00edcie do metal e, em seguida, escapam do estado de adsor\u00e7\u00e3o. Segundo, ele \u00e9 liberado da massa fundida na forma de bolhas. A terceira \u00e9 formar um composto com elementos adicionados ao metal e remov\u00ea-lo na forma de inclus\u00f5es n\u00e3o met\u00e1licas. Ap\u00f3s o tratamento adequado de desgaseifica\u00e7\u00e3o pela AdTech unidade de desgaseifica\u00e7\u00e3o online<\/a>, o teor de g\u00e1s na massa fundida de alum\u00ednio \u00e9 bastante reduzido.<\/p>\n

\"Desgaseifica\u00e7\u00e3o<\/p>\n

M\u00e9todo de refino por desgaseifica\u00e7\u00e3o<\/h2>\n

O m\u00e9todo de refinamento por desgaseifica\u00e7\u00e3o comumente utilizado no processo de fundi\u00e7\u00e3o de alum\u00ednio e ligas de alum\u00ednio \u00e9 o m\u00e9todo de desgaseifica\u00e7\u00e3o por press\u00e3o parcial.<\/p>\n

Quando o g\u00e1s \u00e9 dissolvido no alum\u00ednio fundido e removido dele, os dois processos atingem o equil\u00edbrio a uma determinada temperatura e press\u00e3o. De acordo com a an\u00e1lise termodin\u00e2mica, quando a press\u00e3o parcial do hidrog\u00eanio no g\u00e1s (P1) \u00e9 maior do que a press\u00e3o parcial do hidrog\u00eanio no metal (P2), o g\u00e1s se dissolve no metal; quando P1 \u00e9 menor que P2, o g\u00e1s \u00e9 removido do metal. Portanto, colocar o metal fundido em um ambiente a v\u00e1cuo com baixa press\u00e3o parcial de hidrog\u00eanio ou introduzir um g\u00e1s inerte no metal fundido fornece a for\u00e7a motriz para a desidrogena\u00e7\u00e3o. Na produ\u00e7\u00e3o industrial, geralmente um g\u00e1s inerte (N, Ar) \u00e9 introduzido no metal fundido. Como o interior da bolha est\u00e1 completamente livre de hidrog\u00eanio, ou seja, a press\u00e3o parcial de hidrog\u00eanio na bolha \u00e9 zero, e a press\u00e3o parcial de hidrog\u00eanio no metal fundido ao redor da bolha \u00e9 muito maior que zero.<\/p>\n

Sob o efeito da diferen\u00e7a de press\u00e3o parcial de hidrog\u00eanio entre o interior e o exterior da bolha, os \u00e1tomos de hidrog\u00eanio dissolvidos se difundem at\u00e9 a interface entre a massa fundida e a bolha, onde se recombinam como mol\u00e9culas de hidrog\u00eanio dentro da bolha e, em seguida, flutuam para cima com a bolha para escapar da superf\u00edcie da massa fundida. Esse processo continuar\u00e1 at\u00e9 que as press\u00f5es parciais de hidrog\u00eanio dentro e fora da bolha sejam iguais, ou seja, at\u00e9 que se alcance o equil\u00edbrio. Estudos demonstraram que aumentar a \u00e1rea da interface de contato entre o material fundido e as bolhas inertes facilita a remo\u00e7\u00e3o dos gases dissolvidos.<\/p>\n

Os gases utilizados no m\u00e9todo de desgaseifica\u00e7\u00e3o por press\u00e3o parcial incluem g\u00e1s inerte, g\u00e1s ativo e g\u00e1s misto. Al\u00e9m disso, existe um m\u00e9todo que consiste em adicionar fluxo de fundi\u00e7\u00e3o<\/a>\u00a0para a destilagem do g\u00e1s e a desgaseifica\u00e7\u00e3o do fluxo.<\/p>","protected":false},"excerpt":{"rendered":"

In order to obtain the aluminum melt with low gas content, on the one hand, it is necessary to prepare materials carefully, strictly control the…<\/p>","protected":false},"author":1,"featured_media":4785,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233,30],"tags":[396,397,398],"class_list":["post-2285","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-molten-aluminum-refining-degassing","tag-aluminium-degassing","tag-aluminium-degassing-process","tag-degassing-aluminum"],"yoast_head":"\nDegassing Refining Principle and Method in Molten Aluminum<\/title>\n<meta name=\"description\" content=\"The degassing refining method commonly used in the smelting process of aluminum and aluminum alloys is the partial pressure degassing method.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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