{"id":4814,"date":"2020-09-16T09:01:16","date_gmt":"2020-09-16T09:01:16","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4814"},"modified":"2020-09-16T09:01:16","modified_gmt":"2020-09-16T09:01:16","slug":"aluminum-refining-process","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminum-refining-process\/","title":{"rendered":"Processo de refino do alum\u00ednio"},"content":{"rendered":"<p>O processo de refino de alum\u00ednio inclui dois aspectos: a remo\u00e7\u00e3o de hidrog\u00eanio dentro do forno e a desgaseifica\u00e7\u00e3o em linha fora do forno. Para os lingotes de liga de Al-Mg AA5182 em grande escala, a remo\u00e7\u00e3o de hidrog\u00eanio no forno \u00e9 feita principalmente por meio de solventes, enquanto a remo\u00e7\u00e3o on-line de hidrog\u00eanio fora do forno utiliza principalmente um sistema de desgaseifica\u00e7\u00e3o on-line. Por meio da rota\u00e7\u00e3o do rotor de grafite, o g\u00e1s inerte entra no alum\u00ednio l\u00edquido atrav\u00e9s do rotor de grafite, e a rota\u00e7\u00e3o do alum\u00ednio fundido agita e quebra as bolhas, melhorando a efici\u00eancia da remo\u00e7\u00e3o de hidrog\u00eanio.<\/p>\n<p>O m\u00e9todo de refino do alum\u00ednio no forno inclui a adi\u00e7\u00e3o de <a href=\"http:\/\/www.alalloycasting.com\/pt\/refining-flux\/\">fluxo de refino<\/a> na superf\u00edcie do alum\u00ednio fundido no forno de manuten\u00e7\u00e3o e injetando g\u00e1s inerte no alum\u00ednio fundido. A composi\u00e7\u00e3o qu\u00edmica do agente de refino inclui principalmente: NaCl, NaF, KCl, KF, AlF\u2083, etc. Quando a refina\u00e7\u00e3o no forno \u00e9 realizada em um forno de manuten\u00e7\u00e3o, tamb\u00e9m \u00e9 poss\u00edvel utilizar uma pistola de pulveriza\u00e7\u00e3o de g\u00e1s para injetar g\u00e1s inerte no alum\u00ednio fundido para fins de refina\u00e7\u00e3o; no entanto, a porta do forno de manuten\u00e7\u00e3o precisa ser aberta durante a opera\u00e7\u00e3o, o que resulta em perda de calor para o exterior do forno. \u00c9 dif\u00edcil para os operadores trabalharem em condi\u00e7\u00f5es de alta temperatura, e \u00e9 complicado realizar o refinamento por um longo per\u00edodo.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4816\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminum-Refining-Process-1.jpg\" alt=\"Processo de refino do alum\u00ednio\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminum-Refining-Process-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminum-Refining-Process-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>O refino on-line de alum\u00ednio fora do forno adota principalmente o m\u00e9todo de inje\u00e7\u00e3o rotativa de g\u00e1s inerte. O g\u00e1s inerte utilizado \u00e9 principalmente o Ar. Embora o N\u2082 tamb\u00e9m possa exercer um certo efeito de refina\u00e7\u00e3o, como o N\u2082 e o alum\u00ednio l\u00edquido em alta temperatura podem produzir rea\u00e7\u00f5es qu\u00edmicas que formam nitretos, a pel\u00edcula de \u00f3xido de alum\u00ednio na superf\u00edcie do l\u00edquido \u00e9 destru\u00edda, reduzindo o efeito da remo\u00e7\u00e3o de hidrog\u00eanio. Especialmente quando a temperatura do alum\u00ednio fundido atinge 780 \u00b0C ou mais, a rea\u00e7\u00e3o qu\u00edmica se torna mais evidente. Portanto, para a liga de alum\u00ednio-magn\u00e9sio (A-Mg), o g\u00e1s inerte utilizado para a remo\u00e7\u00e3o de hidrog\u00eanio \u00e9 principalmente o arg\u00f4nio (Ar).<\/p>\n<p>Usando um <a href=\"http:\/\/www.alalloycasting.com\/pt\/online-degassing-system\/\">sistema de desgaseifica\u00e7\u00e3o online<\/a>, o rotor de grafite \u00e9 girado e pulverizado com g\u00e1s inerte para que o Ar seja introduzido no rotor de grafite; em seguida, o rotor de grafite \u00e9 imerso no alum\u00ednio fundido e gira enquanto agita e tritura as bolhas de Ar pulverizadas. No processo de flutua\u00e7\u00e3o das bolhas, o hidrog\u00eanio presente no alum\u00ednio fundido \u00e9 absorvido pelas bolhas devido \u00e0 diferen\u00e7a de press\u00e3o parcial do hidrog\u00eanio dentro e fora delas, sendo removido \u00e0 medida que as bolhas flutuam at\u00e9 a superf\u00edcie do alum\u00ednio fundido. Quanto aos metais alcalinos contidos no alum\u00ednio l\u00edquido, para remov\u00ea-los simultaneamente, uma determinada propor\u00e7\u00e3o de Cl\u2082 e Ar \u00e9 misturada e introduzida no alum\u00ednio l\u00edquido. Quando a liga de Al-Mg AA5182 em grande escala \u00e9 fundida, a vaz\u00e3o do alum\u00ednio l\u00edquido chega a 40 t\/h. Portanto, este artigo utiliza um dispositivo de remo\u00e7\u00e3o de hidrog\u00eanio de tr\u00eas rotores para melhorar a efici\u00eancia da remo\u00e7\u00e3o de hidrog\u00eanio e a vaz\u00e3o do alum\u00ednio fundido.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4817\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminum-Refining-Process-2.jpg\" alt=\"Processo de refino do alum\u00ednio\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminum-Refining-Process-2.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Aluminum-Refining-Process-2-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>A fim de melhorar o efeito de refinamento por desgaseifica\u00e7\u00e3o do alum\u00ednio, o sistema on-line <a href=\"http:\/\/www.alalloycasting.com\/pt\/degassing-unit\/\">unidade de desgaseifica\u00e7\u00e3o<\/a> foi aprimorado em dois aspectos: o primeiro consiste em ampliar o percurso e o tempo de passagem do g\u00e1s no rotor de grafite, a fim de melhorar o efeito de pr\u00e9-aquecimento do g\u00e1s inerte Ar no rotor de grafite. O segundo \u00e9 que, durante o processo de projeto do tanque de refino, a parede interna do tanque foi projetada com um \u00e2ngulo de inclina\u00e7\u00e3o maior. \u00c0 medida que o n\u00edvel do alum\u00ednio l\u00edquido no tanque de refino aumenta, a \u00e1rea da se\u00e7\u00e3o transversal do tanque de refino aumenta proporcionalmente, de modo que ele possa interagir com as bolhas de g\u00e1s inerte. O grau de expans\u00e3o \u00e9 ajustado para evitar que as bolhas se fundam e melhorar o efeito da remo\u00e7\u00e3o de hidrog\u00eanio.<\/p>\n<p>No processo de refino de alum\u00ednio da liga Al-Mg AA5182 em grande escala, seja na remo\u00e7\u00e3o de hidrog\u00eanio dentro do forno ou fora dele, utiliza-se o g\u00e1s inerte N\u2082 ou Ar. Ao mesmo tempo, para remover o Na do alum\u00ednio l\u00edquido, \u00e9 necess\u00e1ria uma pequena quantidade de Cl\u2082 para obter o efeito de refino. Isso porque, como o processo de refino C2 envolve tanto o refino f\u00edsico quanto o qu\u00edmico, o Cl\u2082 pode secar as inclus\u00f5es no alum\u00ednio l\u00edquido, e as inclus\u00f5es e o alum\u00ednio l\u00edquido s\u00e3o facilmente separados, o que favorece a remo\u00e7\u00e3o subsequente das inclus\u00f5es. O efeito de refino \u00e9 o melhor. No entanto, como o Cl\u2082 \u00e9 muito t\u00f3xico, prejudicial \u00e0 sa\u00fade humana, prejudica o meio ambiente e tem forte efeito corrosivo sobre equipamentos de refino, ferramentas, oficinas e outros equipamentos, por isso, atualmente, quase n\u00e3o \u00e9 necess\u00e1rio usar Cl\u2082 puro para refinar o alum\u00ednio l\u00edquido, mas sim uma determinada propor\u00e7\u00e3o de g\u00e1s refinado com Cl\u2082, como Ar ou uma mistura, para melhorar o efeito da remo\u00e7\u00e3o de hidrog\u00eanio.<\/p>","protected":false},"excerpt":{"rendered":"<p>Aluminum refining process includes two aspects: removing hydrogen inside the furnace and on-line degassing outside the furnace. For the AA5182 large-scale Al-Mg alloy ingots, the&hellip;<\/p>","protected":false},"author":1,"featured_media":4815,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4690,4691],"class_list":["post-4814","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-refining-process","tag-flux-refining-and-online-degassing"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Aluminum Refining Process uses Flux Refining and Online Degassing<\/title>\n<meta name=\"description\" content=\"Aluminum refining process includes two aspects: removing hydrogen inside the furnace and on-line degassing outside the furnace.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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