{"id":6408,"date":"2020-11-13T06:27:46","date_gmt":"2020-11-13T06:27:46","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6408"},"modified":"2020-11-13T06:27:46","modified_gmt":"2020-11-13T06:27:46","slug":"flux-refining-methods","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/flux-refining-methods\/","title":{"rendered":"M\u00e9todos de refino por fluxo"},"content":{"rendered":"

De modo geral, a purifica\u00e7\u00e3o em forno inclui o m\u00e9todo do fluxo, o m\u00e9todo de refino a g\u00e1s (g\u00e1s ativo e degrad\u00e1vel), a purifica\u00e7\u00e3o a v\u00e1cuo e a purifica\u00e7\u00e3o em campo. Entre eles, a purifica\u00e7\u00e3o por fluxo e a purifica\u00e7\u00e3o a g\u00e1s s\u00e3o os m\u00e9todos de refino em forno mais amplamente utilizados na ind\u00fastria. A purifica\u00e7\u00e3o por fundente ocorre durante o processo de fundi\u00e7\u00e3o de ligas de alum\u00ednio, quando o fundente \u00e9 adicionado \u00e0 massa fundida; por meio de uma s\u00e9rie de efeitos f\u00edsicos e qu\u00edmicos, alcan\u00e7a-se o objetivo de desgaseifica\u00e7\u00e3o e remo\u00e7\u00e3o de impurezas. A capacidade de remo\u00e7\u00e3o de impurezas do fluxo \u00e9 determinada pela adsor\u00e7\u00e3o e dissolu\u00e7\u00e3o das inclus\u00f5es oxidadas no banho de fus\u00e3o pelo fluxo, bem como pela intera\u00e7\u00e3o qu\u00edmica entre o fluxo e o banho de fus\u00e3o. Quanto menor for a tens\u00e3o interfacial entre o fluxo e as inclus\u00f5es, melhor ser\u00e1 a adsor\u00e7\u00e3o do fluxo e mais eficaz ser\u00e1 a remo\u00e7\u00e3o das impurezas. Al\u00e9m dos m\u00e9todos de refino com fluxo para desgaseifica\u00e7\u00e3o e remo\u00e7\u00e3o de impurezas, existem outros tipos de fluxos, como o agente de cobertura, agente de limpeza de esc\u00f3ria<\/a>, etc. Este artigo aborda principalmente o fluxo utilizado para desgaseifica\u00e7\u00e3o e forma\u00e7\u00e3o de esc\u00f3ria.<\/p>\n

Em compara\u00e7\u00e3o com a purifica\u00e7\u00e3o por fluxo, a purifica\u00e7\u00e3o por g\u00e1s baseia-se principalmente na inje\u00e7\u00e3o de g\u00e1s ativo ou inerte na massa fundida. Al\u00e9m de utilizar a lei da press\u00e3o parcial dos gases para alcan\u00e7ar os objetivos de desgaseifica\u00e7\u00e3o e de adsor\u00e7\u00e3o e inclus\u00e3o de bolhas, o g\u00e1s ativo tamb\u00e9m pode ser combinado com o hidrog\u00eanio presente na massa fundida, que reage diretamente para produzir produtos gasosos, visando a difus\u00e3o e a desgaseifica\u00e7\u00e3o, a flota\u00e7\u00e3o e a remo\u00e7\u00e3o de esc\u00f3ria. Al\u00e9m disso, o g\u00e1s ativo tamb\u00e9m pode reagir com os metais alcalinos ou alcalino-terrosos presentes na massa fundida para gerar sais de baixa densidade, que flutuam at\u00e9 a superf\u00edcie do alum\u00ednio fundido, removendo assim os metais alcalinos e alcalino-terrosos. Tomando como exemplo o cloro, um g\u00e1s reativo t\u00edpico, a rea\u00e7\u00e3o b\u00e1sica do cloro ao entrar na massa fundida \u00e9 a seguinte:<\/p>\n

3Cl\u2082 + 2Al = 2AlCl\u2083\u2191
\nCl\u2082 + H\u2082 = 2HCl\u2191
\nCl\u2082 + 2Na = 2NaCl<\/p>\n

\"M\u00e9todos<\/p>\n

Pode-se observar que o pr\u00f3prio cloro e os produtos da rea\u00e7\u00e3o de clora\u00e7\u00e3o, AlCl\u2083 e HCl, s\u00e3o todos gases, que se elevam espontaneamente na massa fundida. Assim, consegue-se a purifica\u00e7\u00e3o. Al\u00e9m disso, ele pode reagir diretamente com o hidrog\u00eanio presente na massa fundida para alcan\u00e7ar o objetivo de remo\u00e7\u00e3o do hidrog\u00eanio. Trata-se de um meio eficiente para o refinamento da massa fundida.<\/p>","protected":false},"excerpt":{"rendered":"

Generally speaking, furnace purification includes flux method, gas refining method (active and degradable gas), vacuum purification, and field purification. Among them, flux purification and gas…<\/p>","protected":false},"author":1,"featured_media":6409,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6408","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nFlux Refining Methods for Aluminum Degassing and Impurity Removal<\/title>\n<meta name=\"description\" content=\"Flux and gas purification are the most widely used furnace refining methods in the industry. 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