{"id":10286,"date":"2021-09-14T07:06:21","date_gmt":"2021-09-14T07:06:21","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10286"},"modified":"2021-09-14T07:07:24","modified_gmt":"2021-09-14T07:07:24","slug":"refining-methods","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/refining-methods\/","title":{"rendered":"M\u00e9todos de refino"},"content":{"rendered":"

A liga de alum\u00ednio reciclada cont\u00e9m mais impurezas met\u00e1licas e n\u00e3o met\u00e1licas e precisa passar por um refinamento adicional. Os m\u00e9todos de refinamento incluem filtra\u00e7\u00e3o, refinamento a g\u00e1s, refinamento com fluxo, refinamento a v\u00e1cuo e refinamento por oxida\u00e7\u00e3o. Os quatro primeiros m\u00e9todos s\u00e3o utilizados para remover impurezas n\u00e3o met\u00e1licas, enquanto o \u00faltimo m\u00e9todo \u00e9 utilizado para remover impurezas met\u00e1licas.<\/p>\n

Quando a massa fundida da liga de alum\u00ednio regenerada \u00e9 resfriada, a solubilidade do g\u00e1s \u00e9 reduzida, e o hidrog\u00eanio gasoso originalmente dissolvido na massa fundida \u00e9 separado em fases distintas, formando principalmente poros na pe\u00e7a fundida, o que reduzir\u00e1 as propriedades mec\u00e2nicas da pe\u00e7a. Al\u00e9m disso, a impureza n\u00e3o met\u00e1lica s\u00f3lida, a alumina, distribui-se nos limites dos gr\u00e3os, o que tamb\u00e9m reduz as propriedades mec\u00e2nicas da liga. Para que o desempenho da liga regenerada n\u00e3o seja muito diferente do desempenho da liga preparada a partir do metal prim\u00e1rio, \u00e9 necess\u00e1rio realizar o refinamento para remover as impurezas da liga.<\/p>\n

M\u00e9todos de refino de impurezas n\u00e3o met\u00e1licas<\/strong><\/p>\n

(1) Filtragem. Nesse m\u00e9todo, a liga de alum\u00ednio fundida \u00e9 passada por equipamentos de filtragem<\/a> para remover impurezas. Quando a liga fundida passa pelo filtro, as part\u00edculas s\u00f3lidas s\u00e3o retidas e bloqueiam o filtro, sendo assim removidas.<\/p>\n

(2) Refino a g\u00e1s. Ou seja, o cloro e o nitrog\u00eanio s\u00e3o introduzidos na esc\u00f3ria durante o refino. Quando o g\u00e1s introduzido se difunde na massa fundida, o hidrog\u00eanio originalmente dissolvido no l\u00edquido da liga se difunde nas pequenas bolhas do g\u00e1s injetado, ocorrendo a desgaseifica\u00e7\u00e3o; ao mesmo tempo, os \u00f3xidos e outras impurezas insol\u00faveis s\u00e3o removidos. Assim como na flota\u00e7\u00e3o, o g\u00e1s \u00e9 adsorvido nas inclus\u00f5es s\u00f3lidas e, em seguida, flutua at\u00e9 a superf\u00edcie do material fundido.<\/p>\n

(3) Refino com fundente. Nesse m\u00e9todo, a liga fundida \u00e9 tratada com um fundente salino para remover gases e inclus\u00f5es n\u00e3o met\u00e1licas da massa fundida. Os sais comumente utilizados incluem p\u00f3 de criolita e v\u00e1rios halogenetos met\u00e1licos. Depois de serem introduzidos na massa fundida de alum\u00ednio como fundente, eles geram g\u00e1s de halogeneto de alum\u00ednio e se dissipam.<\/p>\n

(4) M\u00e9todo de refino a v\u00e1cuo. Nesse m\u00e9todo, o alum\u00ednio fundido \u00e9 desgaseificado por 20 minutos sob um v\u00e1cuo de 400 a 500 Pa para remover o hidrog\u00eanio do alum\u00ednio fundido.<\/p>","protected":false},"excerpt":{"rendered":"

Recycled aluminum alloy contains more metal and non-metal impurities and must be further refined. Refining methods include filtration, gas refining, flux refining, vacuum refining, and…<\/p>","protected":false},"author":1,"featured_media":10287,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[12679,240,12680,12677,12678,12681],"class_list":["post-10286","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-filtration","tag-flux-refining","tag-gas-refining","tag-refining-methods","tag-remove-non-metal-impurities","tag-vacuum-refining"],"yoast_head":"\nRefining Methods used to Remove Non-metal Impurities<\/title>\n<meta name=\"description\" content=\"Refining methods include filtration, gas refining, flux refining, vacuum refining. 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