{"id":11184,"date":"2021-11-13T08:16:22","date_gmt":"2021-11-13T08:16:22","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=11184"},"modified":"2021-11-12T08:20:13","modified_gmt":"2021-11-12T08:20:13","slug":"fluxes-for-purifying-aluminium","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/fluxes-for-purifying-aluminium\/","title":{"rendered":"Fluxos para a purifica\u00e7\u00e3o do alum\u00ednio"},"content":{"rendered":"<p>A remo\u00e7\u00e3o de impurezas por meio de fundentes \u00e9 um m\u00e9todo importante para a purifica\u00e7\u00e3o do alum\u00ednio fundido. Atualmente, existem muitos tipos de fundentes desenvolvidos e utilizados tanto no pa\u00eds quanto no exterior. Al\u00e9m dos fundentes cujo objetivo principal \u00e9 remover gases e impurezas, existem tamb\u00e9m outros tipos, como agentes de cobertura e agentes de limpeza de esc\u00f3ria. De acordo com o objetivo da purifica\u00e7\u00e3o, os purificadores de alum\u00ednio fundido s\u00e3o divididos em tr\u00eas categorias: purificadores de g\u00e1s, fundentes para remo\u00e7\u00e3o de impurezas e fundentes de purifica\u00e7\u00e3o.<\/p>\n<p>Durante o processo de fundi\u00e7\u00e3o do alum\u00ednio e de suas ligas, surgem poluentes como inclus\u00f5es de \u00f3xido (AlO\u2083) e hidrog\u00eanio, que afetam a pureza da massa fundida, resultando em defeitos como bolhas, poros e inclus\u00f5es soltas no lingote, o que afeta diretamente as propriedades inerentes dos materiais de alum\u00ednio e ligas de alum\u00ednio. Portanto, a remo\u00e7\u00e3o do g\u00e1s e das inclus\u00f5es do alum\u00ednio fundido e a melhoria da pureza do material fundido s\u00e3o um importante tema de pesquisa para a purifica\u00e7\u00e3o do alum\u00ednio e de ligas de alum\u00ednio fundidas, al\u00e9m de constitu\u00edrem um problema t\u00e9cnico urgente a ser resolvido na reciclagem do alum\u00ednio.<\/p>\n<p>Geralmente, a liga de alum\u00ednio fundida cont\u00e9m 0,4 a 0,8 mL\/100 gAl de hidrog\u00eanio. Ap\u00f3s a desgaseifica\u00e7\u00e3o da liga de alum\u00ednio fundida, o n\u00edvel avan\u00e7ado nacional de teor de hidrog\u00eanio \u00e9 de 0,15 mL\/100 gAl, enquanto o n\u00edvel avan\u00e7ado internacional \u00e9 de 0,10 mL\/100 gAl. O <a href=\"http:\/\/www.alalloycasting.com\/pt\/granular-flux\/\">fluxo granular<\/a> pode fazer com que o teor de hidrog\u00eanio na massa fundida de alum\u00ednio fique abaixo de 0,08 mL\/100 g de Al. No alum\u00ednio puro industrial, ap\u00f3s a remo\u00e7\u00e3o de impurezas, o teor de inclus\u00f5es \u00e9 geralmente superior a 0,1%, e o tamanho da maioria das inclus\u00f5es \u00e9 superior a 10 \u00b5m. No padr\u00e3o internacional de remo\u00e7\u00e3o de inclus\u00f5es, o teor de inclus\u00f5es na massa fundida \u00e9 de 0,02%, e o tamanho das inclus\u00f5es \u00e9 inferior a 7 \u00b5m. Os fundentes utilizados no m\u00e9todo de purifica\u00e7\u00e3o da massa fundida de alum\u00ednio podem remover efetivamente as inclus\u00f5es com tamanho superior a 7 \u00b5m.<\/p>\n<p>Devido ao avan\u00e7o da ci\u00eancia e da tecnologia, o campo da fus\u00e3o e purifica\u00e7\u00e3o do alum\u00ednio tem registrado r\u00e1pidos progressos, e seu teor de hidrog\u00eanio caiu para cerca de 0,10 mL\/100 g de Al. A teoria da purifica\u00e7\u00e3o do alum\u00ednio fundido tamb\u00e9m evoluiu da teoria da flota\u00e7\u00e3o por bolhas para o princ\u00edpio do processo que consiste em, primeiro, remover as impurezas e, em seguida, realizar a desgaseifica\u00e7\u00e3o, e, por fim, aplicar uma camada protetora. O processo de remo\u00e7\u00e3o de hidrog\u00eanio do alum\u00ednio fundido consiste em remover diretamente o hidrog\u00eanio at\u00f4mico por meio da difus\u00e3o de \u00e1tomos no interior do alum\u00ednio fundido; al\u00e9m disso, deve haver \u00e1tomos respons\u00e1veis pela remo\u00e7\u00e3o de hidrog\u00eanio e pela desoxigena\u00e7\u00e3o no alum\u00ednio fundido.<\/p>","protected":false},"excerpt":{"rendered":"<p>Impurity removal by fluxes is an important method for purifying aluminium melt. At present, there are many types of fluxes developed and used at home&hellip;<\/p>","protected":false},"author":1,"featured_media":11186,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-11184","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fluxes for Purifying Aluminium -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Impurity removal by fluxes is an important method for purifying aluminium melt. 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