{"id":6568,"date":"2020-11-19T09:18:07","date_gmt":"2020-11-19T09:18:07","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6568"},"modified":"2020-11-19T09:18:07","modified_gmt":"2020-11-19T09:18:07","slug":"on-line-degassing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/on-line-degassing\/","title":{"rendered":"Desgaseifica\u00e7\u00e3o em linha"},"content":{"rendered":"

Atualmente, as fun\u00e7\u00f5es b\u00e1sicas da desgaseifica\u00e7\u00e3o em linha s\u00e3o a desgaseifica\u00e7\u00e3o, a remo\u00e7\u00e3o de esc\u00f3ria e a remo\u00e7\u00e3o de \u00e1lcalis. Al\u00e9m disso, ela tamb\u00e9m possui a fun\u00e7\u00e3o de ajustar o balan\u00e7o t\u00e9rmico do alum\u00ednio fundido no canal de vazamento.<\/p>\n

A desgaseifica\u00e7\u00e3o on-line geralmente utiliza nitrog\u00eanio ou arg\u00f4nio como g\u00e1s transportador, e tamb\u00e9m \u00e9 poss\u00edvel adicionar g\u00e1s cloro 2-5% ao g\u00e1s transportador para melhorar o efeito da desgaseifica\u00e7\u00e3o e da remo\u00e7\u00e3o de \u00e1lcalis.
\nO princ\u00edpio de desgaseifica\u00e7\u00e3o do processo de desgaseifica\u00e7\u00e3o em linha \u00e9 consistente com o princ\u00edpio b\u00e1sico de refino e desgaseifica\u00e7\u00e3o no forno. A desgaseifica\u00e7\u00e3o ainda ocorre por meio da diferen\u00e7a de press\u00e3o parcial e de rea\u00e7\u00f5es qu\u00edmicas.<\/p>\n

No entanto, ao contr\u00e1rio do refinamento no forno, o impulsor de rotor de grafite de alta velocidade do equipamento de desgaseifica\u00e7\u00e3o em linha consegue fragmentar as bolhas em in\u00fameras bolhas pequenas e dispersas. Essas pequenas bolhas ser\u00e3o distribu\u00eddas de maneira mais uniforme no espa\u00e7o limitado da caixa de desgaseifica\u00e7\u00e3o, o que aumenta consideravelmente a \u00e1rea de superf\u00edcie das bolhas e melhora significativamente o efeito de desgaseifica\u00e7\u00e3o por diferen\u00e7a de press\u00e3o parcial.<\/p>\n

Se for adicionado cloro ao g\u00e1s portador, o efeito de desgaseifica\u00e7\u00e3o ser\u00e1 mais eficaz e o efeito de remo\u00e7\u00e3o de \u00e1lcalis ser\u00e1 significativamente aprimorado. O g\u00e1s cloro \u00e9 altamente t\u00f3xico e apresenta riscos potenciais \u00e0 seguran\u00e7a, o que exige um gerenciamento e uso rigorosos.<\/p>\n

Diferente m\u00e9todos de desgaseifica\u00e7\u00e3o on-line<\/a> apresentam diferentes efeitos de desgaseifica\u00e7\u00e3o. Atualmente, a desgaseifica\u00e7\u00e3o em caixa e a desgaseifica\u00e7\u00e3o em calha s\u00e3o comumente utilizadas. Entre eles, o desgaseamento em caixa \u00e9 o mais utilizado, com efeito de opera\u00e7\u00e3o est\u00e1vel e alta efici\u00eancia de desgaseamento (a efici\u00eancia espec\u00edfica de desgaseamento est\u00e1 relacionada ao projeto da caixa de desgaseamento e ao teor inicial de hidrog\u00eanio, geralmente de 35 a 70%), mas o investimento inicial e os custos operacionais s\u00e3o relativamente altos.<\/p>\n

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

A remo\u00e7\u00e3o de esc\u00f3ria na etapa de desgaseifica\u00e7\u00e3o em linha \u00e9 realizada exclusivamente por meio de adsor\u00e7\u00e3o. As part\u00edculas min\u00fasculas de esc\u00f3ria s\u00e3o adsorvidas pelas bolhas e flutuam na superf\u00edcie do alum\u00ednio fundido. Portanto, a esc\u00f3ria de alum\u00ednio na caixa de desgaseifica\u00e7\u00e3o precisa ser limpa regularmente.<\/p>\n

A remo\u00e7\u00e3o de \u00e1lcalis na desgaseifica\u00e7\u00e3o em linha \u00e9 obtida principalmente pela adi\u00e7\u00e3o de g\u00e1s cloro ao g\u00e1s portador. O arg\u00f4nio puro n\u00e3o tem efeito de remo\u00e7\u00e3o de \u00e1lcalis, enquanto o nitrog\u00eanio apresenta um efeito de remo\u00e7\u00e3o mais fraco sobre metais alcalinos individuais.<\/p>\n

A caixa de desgaseifica\u00e7\u00e3o do tipo caixa est\u00e1 equipada com um aquecedor de imers\u00e3o, que permite pr\u00e9-encher a caixa de desgaseifica\u00e7\u00e3o com alum\u00ednio fundido para aumentar a temperatura e evitar os riscos \u00e0 seguran\u00e7a e \u00e0 qualidade causados pela baixa temperatura do alum\u00ednio fundido na fase inicial da fundi\u00e7\u00e3o. Durante o processo de produ\u00e7\u00e3o, a temperatura do alum\u00ednio fundido tamb\u00e9m pode ser ajustada ligando e desligando o aquecedor na caixa de desgaseifica\u00e7\u00e3o, a fim de manter a estabilidade da temperatura do alum\u00ednio fundido durante o processo de fundi\u00e7\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"

At present, the basic functions of on line degassing are degassing, slag removal, and alkali removal. In addition, it also has the function of adjusting…<\/p>","protected":false},"author":1,"featured_media":6588,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6568","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nOn line Degassing Molten Aluminum by Degassing Unit<\/title>\n<meta name=\"description\" content=\"The basic functions of on line degassing are degassing, slag removal. In addition, it also has the function of adjusting the heat balance.\" \/>\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\/on-line-degassing\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"On line Degassing Molten Aluminum by Degassing Unit\" \/>\n<meta property=\"og:description\" content=\"The basic functions of on line degassing are degassing, slag removal. 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