{"id":10597,"date":"2021-10-14T03:45:48","date_gmt":"2021-10-14T03:45:48","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10597"},"modified":"2021-10-14T03:45:48","modified_gmt":"2021-10-14T03:45:48","slug":"inert-gas-metal-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/inert-gas-metal-refining\/","title":{"rendered":"Refinamento de metais em atmosfera de g\u00e1s inerte"},"content":{"rendered":"

A refina\u00e7\u00e3o de metal com g\u00e1s inerte \u00e9 um m\u00e9todo de refina\u00e7\u00e3o no qual o g\u00e1s inerte \u00e9 injetado continuamente na massa fundida de alum\u00ednio, e as impurezas oxidadas e o hidrog\u00eanio s\u00e3o removidos da superf\u00edcie do l\u00edquido durante o processo de flutua\u00e7\u00e3o das bolhas.<\/p>\n

A raz\u00e3o para a desgaseifica\u00e7\u00e3o do metal com g\u00e1s inerte \u00e9 que n\u00e3o h\u00e1 hidrog\u00eanio no g\u00e1s inerte injetado na massa fundida, e sua press\u00e3o parcial de hidrog\u00eanio \u00e9 zero, enquanto a press\u00e3o parcial de hidrog\u00eanio na massa fundida pr\u00f3xima \u00e0s bolhas \u00e9 muito maior que zero. Portanto, h\u00e1 uma diferen\u00e7a de press\u00e3o parcial de hidrog\u00eanio entre o interior e o exterior da bolha. Sob o efeito dessa diferen\u00e7a de press\u00e3o parcial, os \u00e1tomos de hidrog\u00eanio no material fundido se difundem at\u00e9 a interface da bolha e se recombinam na bolha nessa interface. Esse processo de desgaseifica\u00e7\u00e3o n\u00e3o cessar\u00e1 at\u00e9 que a press\u00e3o parcial de hidrog\u00eanio dentro e fora da bolha se iguale.<\/p>\n

O hidrog\u00eanio que entra na bolha escapa para a atmosfera \u00e0 medida que a bolha sobe. Al\u00e9m disso, durante o processo de flutua\u00e7\u00e3o das bolhas, as bolhas de hidrog\u00eanio macromoleculares suspensas na massa fundida e o g\u00e1s presente nas inclus\u00f5es tamb\u00e9m podem ser levados para fora da superf\u00edcie do l\u00edquido por flutua\u00e7\u00e3o, alcan\u00e7ando-se assim o objetivo de desgaseifica\u00e7\u00e3o.<\/p>\n

A raz\u00e3o para o refinamento de metais com g\u00e1s inerte \u00e9 que as bolhas de g\u00e1s inerte injetadas podem absorver as inclus\u00f5es oxidadas na massa fundida e lev\u00e1-las para fora da superf\u00edcie do l\u00edquido durante o processo de flota\u00e7\u00e3o. Esse m\u00e9todo \u00e9 conhecido como m\u00e9todo de remo\u00e7\u00e3o de esc\u00f3ria por flota\u00e7\u00e3o.<\/p>\n

\"\"<\/p>\n

Depois que a bolha de g\u00e1s inerte adsorve as inclus\u00f5es oxidadas na massa fundida, a energia livre superficial total do sistema pode ser reduzida. Portanto, essa adsor\u00e7\u00e3o pode ocorrer automaticamente. Quanto menor for a tens\u00e3o superficial entre o g\u00e1s inerte e as inclus\u00f5es, e quanto maior for a tens\u00e3o superficial entre a massa fundida e o g\u00e1s inerte, bem como a tens\u00e3o de interface entre a massa fundida e as inclus\u00f5es, maior ser\u00e1 a capacidade desse g\u00e1s inerte de remover esc\u00f3ria.<\/p>\n

Ao utilizar g\u00e1s inerte no processo de refino, o fluxo de cobertura<\/a> devem ser espalhadas uniformemente sobre a superf\u00edcie do l\u00edquido. Isso porque, depois que as bolhas de g\u00e1s inerte levam as inclus\u00f5es para fora da superf\u00edcie do l\u00edquido, se houver uma camada de fluxo na superf\u00edcie do l\u00edquido nesse momento, as inclus\u00f5es entrar\u00e3o no fluxo e se transformar\u00e3o em esc\u00f3ria, que \u00e9 f\u00e1cil de remover. Caso contr\u00e1rio, as inclus\u00f5es mais densas cair\u00e3o novamente no alum\u00ednio fundido, e as inclus\u00f5es menos densas formar\u00e3o uma esc\u00f3ria na superf\u00edcie do l\u00edquido, que \u00e9 dif\u00edcil de separar do alum\u00ednio fundido. Quando essas esc\u00f3rias forem removidas, uma grande quantidade de metal fundido ser\u00e1 retirada, aumentando a perda de metal.<\/p>","protected":false},"excerpt":{"rendered":"

Inert gas metal refining is a refining method in which inert gas is continuously blown into the aluminum melt, and oxidized impurities and hydrogen are…<\/p>","protected":false},"author":1,"featured_media":10598,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10597","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nInert Gas Metal Refining, Molten Aluminum Degassing Refining<\/title>\n<meta name=\"description\" content=\"Inert gas metal refining is a refining method, it can remove the oxidized impurities and hydrogen during the floating process of the bubbles.\" \/>\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\/inert-gas-metal-refining\/\" \/>\n<meta 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