{"id":10438,"date":"2021-09-29T09:26:28","date_gmt":"2021-09-29T09:26:28","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10438"},"modified":"2021-09-29T09:26:28","modified_gmt":"2021-09-29T09:26:28","slug":"aluminium-melt-degassing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminium-melt-degassing\/","title":{"rendered":"Desgaseifica\u00e7\u00e3o do alum\u00ednio fundido"},"content":{"rendered":"

O sistema de desgaseifica\u00e7\u00e3o do alum\u00ednio fundido \u00e9 o \u00faltimo processo destinado a reduzir o teor de hidrog\u00eanio. Sua efici\u00eancia e o efeito da desgaseifica\u00e7\u00e3o s\u00e3o muito importantes. O equipamento de desgaseifica\u00e7\u00e3o em linha utilizado na fundi\u00e7\u00e3o cont\u00ednua e na lamina\u00e7\u00e3o adota o m\u00e9todo de desgaseifica\u00e7\u00e3o por rotor girat\u00f3rio.<\/p>\n

Na oficina de fus\u00e3o e fundi\u00e7\u00e3o, o teor de hidrog\u00eanio e as inclus\u00f5es n\u00e3o met\u00e1licas da liga de alum\u00ednio fundida afetam gravemente a qualidade das pe\u00e7as fundidas. Normalmente, durante o processo de solidifica\u00e7\u00e3o, \u00e0 medida que a solubilidade do hidrog\u00eanio diminui, o hidrog\u00eanio e as inclus\u00f5es n\u00e3o met\u00e1licas entram no cristalizador, o que causar\u00e1 manchas brancas e poros min\u00fasculos na superf\u00edcie das chapas e folhas durante o processo de lamina\u00e7\u00e3o subsequente. As propriedades mec\u00e2nicas do material s\u00e3o reduzidas, e o produto acaba sendo descartado. Portanto, a liga de alum\u00ednio fundida deve ser desgaseificada e purificada.<\/p>\n

O m\u00e9todo de flota\u00e7\u00e3o \u00e9, atualmente, o m\u00e9todo mais utilizado para desgaseificar e purificar o alum\u00ednio fundido. O princ\u00edpio consiste em introduzir um g\u00e1s inerte ou um g\u00e1s ativo insol\u00favel no alum\u00ednio fundido, ou adicionar um sal de cloreto para que reaja com o alum\u00ednio fundido e gere um g\u00e1s, o que produz um grande n\u00famero de bolhas que escapam do alum\u00ednio fundido.<\/p>\n

Os \u00e1tomos de hidrog\u00eanio dissolvidos no alum\u00ednio fundido migram para a superf\u00edcie das bolhas de purifica\u00e7\u00e3o, s\u00e3o adsorvidos na superf\u00edcie dessas bolhas, formam hidretos nas bolhas de hidrog\u00eanio e, por fim, escapam do processo cin\u00e9tico do alum\u00ednio fundido \u00e0 medida que as bolhas sobem, completando a desgaseifica\u00e7\u00e3o e a purifica\u00e7\u00e3o do alum\u00ednio fundido.<\/p>\n

O desgaseamento por rotor girat\u00f3rio<\/a> Esse m\u00e9todo permite aproveitar ao m\u00e1ximo as vantagens do m\u00e9todo de flota\u00e7\u00e3o por bolhas para a remo\u00e7\u00e3o de hidrog\u00eanio. O segredo est\u00e1 no fato de que o l\u00edquido forma um fluxo turbulento sob a forte a\u00e7\u00e3o do bocal, e as bolhas s\u00e3o rompidas e dispersadas uniformemente sob a a\u00e7\u00e3o do bocal e do fluxo turbulento.<\/p>\n

Como o m\u00e9todo de desgaseifica\u00e7\u00e3o por rotor girat\u00f3rio permite que o di\u00e2metro das bolhas seja muito pequeno, o efeito de agita\u00e7\u00e3o das bolhas na superf\u00edcie do l\u00edquido torna-se muito reduzido, de modo que o fluxo de ar pode ser relativamente aumentado. Para obter alta efici\u00eancia de desgaseifica\u00e7\u00e3o, \u00e9 necess\u00e1rio garantir um determinado fluxo de ar. O fluxo de ar \u00e9 geralmente o principal fator que influencia o efeito de desgaseifica\u00e7\u00e3o da flota\u00e7\u00e3o por bolhas. Nas mesmas condi\u00e7\u00f5es, o aumento do fluxo de g\u00e1s aumentar\u00e1 a \u00e1rea de superf\u00edcie espec\u00edfica de contato g\u00e1s-l\u00edquido.<\/p>\n

Devido ao efeito de agita\u00e7\u00e3o causado pelo rotor girat\u00f3rio no interior do alum\u00ednio fundido, o alum\u00ednio fundido encontra-se em movimento, o que aumenta a velocidade de deslocamento das bolhas no alum\u00ednio fundido, o que \u00e9 ben\u00e9fico para melhorar a capacidade de transfer\u00eancia de massa do alum\u00ednio fundido.<\/p>\n

Devido ao movimento ascendente n\u00e3o linear das bolhas no alum\u00ednio fundido, o tempo de perman\u00eancia das bolhas no alum\u00ednio fundido \u00e9 relativamente longo; ou seja, o tempo de desidrogena\u00e7\u00e3o por a\u00e7\u00e3o das bolhas \u00e9 aumentado, de modo que a fun\u00e7\u00e3o de desidrogena\u00e7\u00e3o das bolhas possa ser plenamente exercida<\/p>\n

As bolhas est\u00e3o distribu\u00eddas uniformemente no alum\u00ednio fundido, o que pode reduzir a dist\u00e2ncia de difus\u00e3o dos \u00e1tomos de hidrog\u00eanio no alum\u00ednio fundido at\u00e9 as bolhas, de modo que o processo de difus\u00e3o em toda a massa fundida \u00e9 intensificado e as condi\u00e7\u00f5es de transfer\u00eancia de massa s\u00e3o efetivamente melhoradas.<\/p>","protected":false},"excerpt":{"rendered":"

The aluminium melt degassing system is the last process to reduce the hydrogen content. Its degassing efficiency and degassing effect are very important. The online…<\/p>","protected":false},"author":1,"featured_media":10439,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10438","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nAluminium Melt Degassing for Continuous Casting and Rolling<\/title>\n<meta name=\"description\" content=\"The aluminium melt degassing system is the last process to reduce the hydrogen content. 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