{"id":10548,"date":"2021-10-12T09:07:07","date_gmt":"2021-10-12T09:07:07","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10548"},"modified":"2021-10-12T09:07:07","modified_gmt":"2021-10-12T09:07:07","slug":"melting-furnace-refining-flux","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/melting-furnace-refining-flux\/","title":{"rendered":"Fluxo de refino para forno de fus\u00e3o"},"content":{"rendered":"<p>O fluxo de refino do forno de fus\u00e3o remove as inclus\u00f5es n\u00e3o met\u00e1licas, e a esc\u00f3ria seca, semelhante a cinza, produzida \u00e9 facilmente separada do metal l\u00edquido. Assim, facilita-se a remo\u00e7\u00e3o da esc\u00f3ria e reduz-se a perda de metal causada pelo alum\u00ednio que permanece na espuma. O refino do alum\u00ednio fundido foi desenvolvido especialmente para a prote\u00e7\u00e3o ambiental.<\/p>\n<p>O fluxo de refino para fornos de fus\u00e3o n\u00e3o produz poeira durante o uso e emite pouca fuma\u00e7a. Em compara\u00e7\u00e3o com o fluxo em p\u00f3, <a href=\"http:\/\/www.alalloycasting.com\/pt\/granular-flux\/\">fluxo granular<\/a> pode ser usado em quantidade reduzida.<\/p>\n<p>H\u00e1 uma fina camada de alumina na superf\u00edcie das limalhas de alum\u00ednio. Essa camada cresce mais rapidamente quando os res\u00edduos s\u00e3o expostos a temperaturas mais altas e derretem. Al\u00e9m disso, a alumina acaba flutuando at\u00e9 a superf\u00edcie e formando uma fase de esc\u00f3ria. A tens\u00e3o superficial da camada de \u00f3xido far\u00e1 com que o alum\u00ednio fique retido na fase de esc\u00f3ria. Isso \u00e9 altamente indesej\u00e1vel, pois o teor de metal na esc\u00f3ria pode chegar a 80%.<\/p>\n<p>Portanto, \u00e9 necess\u00e1rio utilizar o agente de refino do forno para recuperar o alum\u00ednio contido na esc\u00f3ria, destruindo a camada de \u00f3xido e liberando o metal retido. Isso \u00e9 alcan\u00e7ado pela altera\u00e7\u00e3o da forma das got\u00edculas de alum\u00ednio, o que leva \u00e0 fissura\u00e7\u00e3o da camada de \u00f3xido. Esses tipos de fundentes baseiam-se na composi\u00e7\u00e3o padr\u00e3o de 50% em peso de NaCl e 50% em peso de KCl, e a temperatura eut\u00e9tica \u00e9 de cerca de 660 \u00b0C. A adi\u00e7\u00e3o de sal de fluoreto ajuda a promover a coalesc\u00eancia e a produzir um fundente com teor de metal muito menor. Em particular, o Na\u2083AlF\u2086 \u00e9 muito \u00fatil para reduzir a tens\u00e3o superficial.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10543\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2021\/10\/Melting-Aluminum-Fluxes.jpg\" alt=\"Fluxos para fus\u00e3o de alum\u00ednio\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/10\/Melting-Aluminum-Fluxes.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2021\/10\/Melting-Aluminum-Fluxes-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Al\u00e9m de recuperar o metal da fase de esc\u00f3ria, as principais tarefas do <a href=\"http:\/\/www.alalloycasting.com\/pt\/refining-agent\/\">agente refinador<\/a> incluem: proteger a massa fundida contra oxida\u00e7\u00e3o adicional, cobrindo, dissolvendo ou suspendendo impurezas, \u00f3xidos e outras part\u00edculas n\u00e3o met\u00e1licas. As got\u00edculas de compostos salinos atuam como bolhas e suspendem as inclus\u00f5es na superf\u00edcie por flutua\u00e7\u00e3o. Como a velocidade com que as got\u00edculas de fundente sobem \u00e0 superf\u00edcie \u00e9 muito menor do que a das bolhas, \u00e9 necess\u00e1rio um certo tempo de estabiliza\u00e7\u00e3o. Al\u00e9m disso, devido ao gradiente de densidade, cerca de meia hora de tempo de sedimenta\u00e7\u00e3o far\u00e1 com que as inclus\u00f5es se depositem na parte traseira do forno. Inclus\u00f5es maiores e mais densas se depositam mais rapidamente do que as menores e menos densas.<\/p>","protected":false},"excerpt":{"rendered":"<p>Melting furnace refining flux removes non-metallic inclusions, the dry ash-like slag produced is easily separated from the liquid metal. Therefore, slag skimming is promoted, and&hellip;<\/p>","protected":false},"author":1,"featured_media":10549,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-10548","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fluxes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Melting Furnace Refining Flux -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Melting furnace refining flux removes non-metallic inclusions, the dry ash-like slag produced is easily separated from the liquid metal.\" \/>\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\/melting-furnace-refining-flux\/\" 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