{"id":5074,"date":"2020-09-25T06:26:59","date_gmt":"2020-09-25T06:26:59","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5074"},"modified":"2020-09-25T06:26:59","modified_gmt":"2020-09-25T06:26:59","slug":"purification-mechanism-on-aluminum-melt","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/purification-mechanism-on-aluminum-melt\/","title":{"rendered":"Mecanismo de purifica\u00e7\u00e3o do alum\u00ednio fundido"},"content":{"rendered":"

Mecanismo de purifica\u00e7\u00e3o do alum\u00ednio fundido: aproveita-se a diferen\u00e7a entre a press\u00e3o parcial de hidrog\u00eanio no g\u00e1s inerte de alta pureza e a press\u00e3o parcial de hidrog\u00eanio no alum\u00ednio l\u00edquido. Por meio da difus\u00e3o, os \u00e1tomos de hidrog\u00eanio se difundem para dentro das bolhas de g\u00e1s inerte, formando mol\u00e9culas de hidrog\u00eanio, e, acompanhando a subida das bolhas, s\u00e3o removidos do alum\u00ednio fundido, alcan\u00e7ando-se assim o objetivo de remo\u00e7\u00e3o do hidrog\u00eanio. Durante o processo de ascens\u00e3o da bolha de g\u00e1s inerte, por meio do princ\u00edpio da adsor\u00e7\u00e3o por tens\u00e3o, tamb\u00e9m \u00e9 poss\u00edvel adsorver algumas pequenas part\u00edculas de inclus\u00f5es n\u00e3o met\u00e1licas, alcan\u00e7ando assim o objetivo de remo\u00e7\u00e3o de impurezas.<\/p>\n

A efici\u00eancia da desgaseifica\u00e7\u00e3o com g\u00e1s inerte e da forma\u00e7\u00e3o de esc\u00f3ria est\u00e1 diretamente relacionada \u00e0 \u00e1rea de contato entre as bolhas e o alum\u00ednio fundido. Quanto maior a superf\u00edcie de contato, melhor ser\u00e1 o efeito de desgaseifica\u00e7\u00e3o e forma\u00e7\u00e3o de esc\u00f3ria. Para um mesmo volume de g\u00e1s, quanto menor for a bolha, melhor ser\u00e1 o efeito de desgaseifica\u00e7\u00e3o.<\/p>\n

O mecanismo de purifica\u00e7\u00e3o com g\u00e1s misto na liga de alum\u00ednio fundida consiste em adicionar uma determinada quantidade de cloro ao g\u00e1s inerte para melhorar a efici\u00eancia da purifica\u00e7\u00e3o. O cloro em si \u00e9 insol\u00favel na liga de alum\u00ednio fundida, mas pode reagir quimicamente com o excesso de alum\u00ednio l\u00edquido para gerar g\u00e1s AlCl\u2083. Durante o processo de flutua\u00e7\u00e3o, da mesma forma que no mecanismo de remo\u00e7\u00e3o por g\u00e1s inerte, ele permite obter o efeito de remo\u00e7\u00e3o de g\u00e1s e de esc\u00f3ria. O AlCl\u2083 tamb\u00e9m apresenta um bom efeito de remo\u00e7\u00e3o de esc\u00f3ria. Outra fun\u00e7\u00e3o do refinamento com cloro \u00e9 remover metais alcalinos e metais alcalino-terrosos. Para fios-pratos de alum\u00ednio-magn\u00e9sio-sil\u00edcio, n\u00e3o \u00e9 recomendado seu uso; mesmo que seja necess\u00e1rio utilizar um g\u00e1s misto com cloro para o refinamento, o teor de cloro no g\u00e1s misto n\u00e3o deve exceder 1%.<\/p>\n

\"Mecanismo<\/p>\n

O m\u00e9todo de purifica\u00e7\u00e3o do agente de refino utiliza o g\u00e1s cloreto ou fluoreto gerado pelo composto presente no agente de refino em alta temperatura, como o hexacloroetano, o cloreto de s\u00f3dio, o cloreto de pot\u00e1ssio e outros compostos que, ao se decomporem em alta temperatura, liberam cloro, fluorosilicato de s\u00f3dio gerado em alta temperatura, tetrafluoreto de sil\u00edcio, etc., permitindo a desgaseifica\u00e7\u00e3o e a remo\u00e7\u00e3o de esc\u00f3ria durante o processo de flota\u00e7\u00e3o. Ao mesmo tempo, os compostos presentes no agente refinador<\/a> e as inclus\u00f5es oxidadas na massa fundida podem ser adsorvidas ou dissolvidas. A criolita presente no agente de refino pode dissolver a alumina, permitindo a separa\u00e7\u00e3o da esc\u00f3ria de alum\u00ednio.<\/p>","protected":false},"excerpt":{"rendered":"

Purification mechanism of aluminum melt: use the difference between the hydrogen partial pressure in the high-purity inert gas and the hydrogen partial pressure in the…<\/p>","protected":false},"author":1,"featured_media":5130,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5074","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nPurification Mechanism on Aluminum Melt | Degassing Refining<\/title>\n<meta name=\"description\" content=\"Purification mechanism of aluminum melt: use the difference between the hydrogen partial pressure in inert gas and aluminum liquid.\" \/>\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\/purification-mechanism-on-aluminum-melt\/\" 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