{"id":4625,"date":"2020-09-10T07:35:37","date_gmt":"2020-09-10T07:35:37","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4625"},"modified":"2020-09-10T07:35:37","modified_gmt":"2020-09-10T07:35:37","slug":"rotary-degassing-with-nitrogen","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/rotary-degassing-with-nitrogen\/","title":{"rendered":"Desgaseifica\u00e7\u00e3o rotativa com nitrog\u00eanio"},"content":{"rendered":"<p>A desgaseifica\u00e7\u00e3o rotativa com nitrog\u00eanio foi aplicada pela primeira vez ao refino cont\u00ednuo em grandes fornos de fus\u00e3o. O g\u00e1s inerte \u00e9 introduzido no l\u00edquido por meio de uma haste rotativa e l\u00e2minas especialmente projetadas. A rota\u00e7\u00e3o do bico e o efeito de cisalhamento das l\u00e2minas fazem com que as bolhas de g\u00e1s inerte se dispersem uniformemente no l\u00edquido do cadinho. Ao mesmo tempo, forma-se um v\u00f3rtice na parte mais profunda do l\u00edquido, que sobe lentamente, de modo que haja a maior \u00e1rea de contato poss\u00edvel entre a bolha e o l\u00edquido, o que cria condi\u00e7\u00f5es favor\u00e1veis para a remo\u00e7\u00e3o eficaz de hidrog\u00eanio e esc\u00f3ria.<\/p>\n<p>Al\u00e9m disso, n\u00e3o ocorre rea\u00e7\u00e3o qu\u00edmica entre o g\u00e1s inerte e o alum\u00ednio fundido, e n\u00e3o h\u00e1 pel\u00edcula de passiva\u00e7\u00e3o na superf\u00edcie das bolhas, que podem adsorver facilmente hidrog\u00eanio e esc\u00f3ria oxidada, flutuando at\u00e9 a superf\u00edcie do l\u00edquido gra\u00e7as \u00e0 flutuabilidade das bolhas. Al\u00e9m disso, o g\u00e1s \u00e9 cortado pelas p\u00e1s girat\u00f3rias, as bolhas s\u00e3o distribu\u00eddas de maneira extremamente uniforme na massa fundida, e esta \u00e9 agitada de forma adequada, expandindo assim significativamente a interface e o alcance da a\u00e7\u00e3o, prolongando o tempo de a\u00e7\u00e3o e aumentando a difus\u00e3o do hidrog\u00eanio para dentro das bolhas. O gradiente de concentra\u00e7\u00e3o da transfer\u00eancia de massa refor\u00e7a o papel da remo\u00e7\u00e3o de hidrog\u00eanio e da remo\u00e7\u00e3o de esc\u00f3ria.<\/p>\n<p>A forte agita\u00e7\u00e3o na parte mais profunda do banho fundido tamb\u00e9m promove o ac\u00famulo de pequenas inclus\u00f5es de esc\u00f3ria e facilita a remo\u00e7\u00e3o do material flutuante. A superf\u00edcie l\u00edquida da liga gira de maneira constante, sem grandes oscila\u00e7\u00f5es, de modo que h\u00e1 menor forma\u00e7\u00e3o de esc\u00f3ria e menor suc\u00e7\u00e3o de ar.<\/p>\n<p>As pessoas borrifam o p\u00f3<a href=\"http:\/\/www.alalloycasting.com\/pt\/refining-agent\/\"> agente refinador<\/a> com cloreto e g\u00e1s inerte na parte inferior do cadinho, e alcan\u00e7ar o objetivo de desgaseifica\u00e7\u00e3o e remo\u00e7\u00e3o de esc\u00f3ria por meio de uma s\u00e9rie de efeitos f\u00edsicos e qu\u00edmicos. As inclus\u00f5es de g\u00e1s e esc\u00f3ria no l\u00edquido s\u00e3o significativamente reduzidas, e os efeitos de remo\u00e7\u00e3o de hidrog\u00eanio e de esc\u00f3ria s\u00e3o not\u00e1veis. Isso ocorre porque, durante a pulveriza\u00e7\u00e3o rotativa, as l\u00e2minas girat\u00f3rias do bico cortam o g\u00e1s ao mesmo tempo em que dispersam o agente refinador uniformemente no l\u00edquido dentro do cadinho. As diversas partes do alum\u00ednio l\u00edquido fazem com que o agente refinador reaja mais completamente com o g\u00e1s presente no alum\u00ednio l\u00edquido, e o tempo de a\u00e7\u00e3o \u00e9 prolongado, o que favorece ainda mais a remo\u00e7\u00e3o das inclus\u00f5es e do g\u00e1s do alum\u00ednio l\u00edquido.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4627\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Rotary-Degassing-With-Nitrogen-1.jpg\" alt=\"Desgaseifica\u00e7\u00e3o rotativa com nitrog\u00eanio\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Rotary-Degassing-With-Nitrogen-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Rotary-Degassing-With-Nitrogen-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>No processo de teste, utilizando o mesmo agente refinador, sob a condi\u00e7\u00e3o de que o peso do agente refinador e o tempo de desgaseifica\u00e7\u00e3o sejam os mesmos, comparou-se com a desgaseifica\u00e7\u00e3o manual o estado das inclus\u00f5es de esc\u00f3ria na liga e o grau de porosidade ap\u00f3s a desgaseifica\u00e7\u00e3o. Os n\u00edveis s\u00e3o muito diferentes. Isso ocorre porque o agente de refino e o g\u00e1s inerte s\u00e3o injetados no l\u00edquido por meio de hastes e l\u00e2minas rotativas especialmente projetadas. Aproveitando a rota\u00e7\u00e3o do bico e a a\u00e7\u00e3o de cisalhamento das l\u00e2minas, o agente de refino e o g\u00e1s inerte s\u00e3o dispersos uniformemente na massa fundida ao mesmo tempo. O grau de dispers\u00e3o uniforme \u00e9 muito diferente do grau de dispers\u00e3o uniforme obtido na desgaseifica\u00e7\u00e3o manual. Durante o <a href=\"http:\/\/www.alalloycasting.com\/pt\/degassing-process\/\">processo de desgaseifica\u00e7\u00e3o<\/a>, observe a superf\u00edcie do alum\u00ednio fundido. \u00c9 poss\u00edvel perceber o grau de efervesc\u00eancia. O tamanho e o grau de ebuli\u00e7\u00e3o das bolhas na superf\u00edcie do l\u00edquido s\u00e3o basicamente os mesmos na desgaseifica\u00e7\u00e3o por jato rotativo, enquanto as bolhas na superf\u00edcie do l\u00edquido n\u00e3o chegam a ferver na desgaseifica\u00e7\u00e3o manual. Para o mesmo peso de agente refinador, a diferen\u00e7a no tempo de a\u00e7\u00e3o \u00e9 de quase 1\/3.<\/p>\n<p>Em compara\u00e7\u00e3o com o processo tradicional de purifica\u00e7\u00e3o de l\u00edquidos com liga de alum\u00ednio, a tecnologia de purifica\u00e7\u00e3o por desgaseifica\u00e7\u00e3o rotativa com nitrog\u00eanio apresenta as seguintes vantagens:<\/p>\n<ul>\n<li>Promover a homogeneiza\u00e7\u00e3o da composi\u00e7\u00e3o qu\u00edmica da liga e reduzir a segrega\u00e7\u00e3o dos elementos da liga;<\/li>\n<li>Reduzir as flutua\u00e7\u00f5es de qualidade causadas por fatores humanos, garantir um bom efeito de purifica\u00e7\u00e3o e alta efici\u00eancia de produ\u00e7\u00e3o;<\/li>\n<li>Isso reduz a polui\u00e7\u00e3o do ar, melhora as condi\u00e7\u00f5es de trabalho e diminui a intensidade do trabalho dos funcion\u00e1rios.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Rotary Degassing With Nitrogen was first applied to continuous refining in large melting furnaces. The inert gas is passed into the liquid through a specially&hellip;<\/p>","protected":false},"author":1,"featured_media":4626,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[1762,4348,116,4302,4351,4303,1754,4350,4349,4347,4301,1980],"class_list":["post-4625","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-degassing-aluminum-casting","tag-degassing-aluminum-with-nitrogen","tag-degassing-in-casting","tag-degassing-molten-aluminum","tag-degassing-molten-aluminum-with-nitrogen","tag-degassing-of-aluminium-alloys","tag-degassing-process-in-aluminium","tag-degassing-solutions-with-nitrogen","tag-degassing-with-liquid-nitrogen","tag-degassing-with-nitrogen","tag-nitrogen-degassing-aluminum","tag-rotary-degassing-aluminum"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Rotary Degassing With Nitrogen, Degassing Process In Aluminium<\/title>\n<meta name=\"description\" content=\"Rotary Degassing With Nitrogen was first applied to continuous refining in large melting furnaces. 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