{"id":8234,"date":"2021-03-31T03:36:36","date_gmt":"2021-03-31T03:36:36","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=8234"},"modified":"2021-03-31T03:36:36","modified_gmt":"2021-03-31T03:36:36","slug":"solid-flux","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/solid-flux\/","title":{"rendered":"Fluxo s\u00f3lido"},"content":{"rendered":"

O refinamento com fundente refere-se \u00e0 adi\u00e7\u00e3o de compostos para limpar o forno (de fus\u00e3o ou de manuten\u00e7\u00e3o) ou para transferir a massa fundida da liga de alum\u00ednio para a concha. A refina\u00e7\u00e3o com fundente \u00e9 a primeira etapa para se obter metal fundido puro, evitando a forma\u00e7\u00e3o excessiva de \u00f3xidos, removendo inclus\u00f5es n\u00e3o met\u00e1licas da massa fundida e impedindo e removendo o ac\u00famulo de \u00f3xidos nas paredes do forno. Geralmente, os fundentes podem ser divididos em duas categorias: gasosos ou s\u00f3lidos.<\/p>\n

O fluxo de g\u00e1s pode ser uma mistura de g\u00e1s inerte e g\u00e1s quimicamente ativo injetada no banho fundido.<\/p>\n

O fluxo s\u00f3lido \u00e9 uma mistura de sais, sendo o tipo de fluxo mais utilizado nas fundi\u00e7\u00f5es, especialmente porque as preocupa\u00e7\u00f5es ambientais eliminaram quase completamente as misturas gasosas que cont\u00eam cloro.<\/p>\n

O fluxo \u00e9 uma mistura especial de compostos inorg\u00e2nicos s\u00f3lidos t\u00edpicos, projetada para desgaseificar, desmagnetizar, limpar, refinar o gr\u00e3o e modificar quimicamente a liga de alum\u00ednio fundida, bem como para outros fins. O fluxo \u00e9 geralmente adicionado ao forno, cadinho, concha ou outros recipientes de alum\u00ednio durante a fus\u00e3o, a manuten\u00e7\u00e3o do calor ou a desgaseifica\u00e7\u00e3o do alum\u00ednio. A qualidade da mat\u00e9ria-prima do fluxo, o m\u00e9todo de adi\u00e7\u00e3o e a forma do produto afetam a efici\u00eancia. A formula\u00e7\u00e3o do fluxo varia de acordo com sua finalidade e outras vari\u00e1veis do processo (como a liga e a temperatura).<\/p>\n

O fluxo s\u00f3lido \u00e9 composto principalmente por uma mistura de sais de cloreto e fluoreto, al\u00e9m de aditivos que conferem propriedades especiais.<\/p>\n

A maioria dos fundentes \u00e9 composta por uma mistura de KCl e NaCl, formando um eut\u00e9tico de baixa temperatura (665 \u00b0C). Outro componente comum nos fundentes \u00e9 o NaF, que forma um eut\u00e9tico tern\u00e1rio com KCl e NaCl e possui um ponto de fus\u00e3o de 607 \u00b0C.<\/p>\n

O comum fluxo de cobertura<\/a> cont\u00e9m cerca de 47,5% de NaCl, 47,5% de KCl e 5% de sal de fl\u00faor. O baixo ponto de fus\u00e3o \u00e9 importante, pois melhora a fluidez do fundente.<\/p>\n

Outra camada protetora fluxos<\/a> s\u00e3o baseados em MgCl\u2082-KCl (que forma um eut\u00e9tico de baixo ponto de fus\u00e3o a 424 \u00b0C) ou em alcalioleita (MgCl\u2082\u00d7KCl), que funde a 485 \u00b0C. Esses fluxos de cobertura apresentam alta fluidez e podem formar uma camada fina na superf\u00edcie do material fundido. No entanto, o MgCl\u2082 \u00e9 bastante caro, por isso \u00e9 utilizado principalmente em fluxos sem s\u00f3dio para ligas com teor de magn\u00e9sio superior a 2% em peso. Eles tamb\u00e9m podem ser utilizados quando \u00e9 importante remover o c\u00e1lcio em ligas com teor relativamente alto de magn\u00e9sio.<\/p>","protected":false},"excerpt":{"rendered":"

Flux refining refers to the addition of compounds to clean the furnace (melting or holding) or to transfer the molten aluminum alloy pool in the…<\/p>","protected":false},"author":1,"featured_media":8235,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-8234","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nSolid Flux for Molten Aluminum Refining -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"The solid flux is mainly a mixture of chloride and fluoride salts and additives to instill special properties, based on KCl and NaCl.\" \/>\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\/solid-flux\/\" \/>\n<meta property=\"og:locale\" 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