{"id":10655,"date":"2021-10-18T08:58:54","date_gmt":"2021-10-18T08:58:54","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10655"},"modified":"2021-10-18T08:58:54","modified_gmt":"2021-10-18T08:58:54","slug":"online-refining-filtration","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/online-refining-filtration\/","title":{"rendered":"Refinamento e Filtragem Online"},"content":{"rendered":"

Ap\u00f3s o refinamento no forno est\u00e1tico, aguarde 30 minutos; as bolhas geradas pelo refinamento na massa fundida transportam o hidrog\u00eanio que se difunde para dentro delas, e a esc\u00f3ria oxidada aderida \u00e0 superf\u00edcie durante a fase de ascens\u00e3o das bolhas transborda da superf\u00edcie do l\u00edquido \u2014 o que geralmente \u00e9 exigido para produtos de baixa qualidade. Quando o modificador \u00e9 adicionado no processo de fus\u00e3o, pode-se prosseguir para o processo de fundi\u00e7\u00e3o. No entanto, para produtos de alta qualidade, s\u00e3o necess\u00e1rios o refinamento em linha e a filtragem em linha para purificar ainda mais o metal fundido. Ao mesmo tempo, \u00e9 recomend\u00e1vel utilizar o m\u00e9todo de modifica\u00e7\u00e3o em linha, de modo que o modificador seja adicionado cerca de 15 minutos antes da fundi\u00e7\u00e3o e, em seguida, o processo passe para a etapa de fundi\u00e7\u00e3o.<\/p>\n

Sabemos que a fundi\u00e7\u00e3o e a lamina\u00e7\u00e3o s\u00e3o opera\u00e7\u00f5es cont\u00ednuas. Uma vez iniciada a produ\u00e7\u00e3o, ela pode ocorrer ininterruptamente por v\u00e1rios dias ou mais de uma semana. No entanto, a efici\u00eancia produtiva da fundi\u00e7\u00e3o e da lamina\u00e7\u00e3o \u00e9 baixa. Geralmente, o fluxo de alum\u00ednio fundido que passa pelo dispositivo de desgaseifica\u00e7\u00e3o e filtragem em linha \u00e9 inferior a 2 t por hora; portanto, a capacidade do dispositivo de processamento on-line<\/a> para fundi\u00e7\u00e3o e lamina\u00e7\u00e3o n\u00e3o deve ser muito grande.<\/p>\n

Se a capacidade for muito grande, o alum\u00ednio l\u00edquido permanece no tanque de refino e o Caixa de filtro CFF<\/a> h\u00e1 muito tempo. Uma delas \u00e9 aumentar o investimento em equipamentos, prolongar o tempo de processamento e desperdi\u00e7ar recursos e energia; a outra \u00e9 afetar a qualidade do produto, especialmente quando o tempo de reten\u00e7\u00e3o do alum\u00ednio l\u00edquido na caixa de filtragem ultrapassa a metade. Por mais de horas, o teor de ar do alum\u00ednio fundido ap\u00f3s a filtragem de refino em linha foi bastante reduzido, e a possibilidade e a velocidade de rea\u00e7\u00e3o com a atmosfera ambiente aumentaram, fazendo com que o teor de ar voltasse a subir. A pr\u00e1tica mostra que, se o tempo de perman\u00eancia exceder 40 min, o teor de g\u00e1s na massa fundida aumenta em cerca de 0,01 m\/ (100 g de Al).<\/p>\n

\"\"<\/p>\n

No que diz respeito \u00e0 fundi\u00e7\u00e3o, mais de 90% de liga de alum\u00ednio \u00e9 produzida por fundi\u00e7\u00e3o vertical semicont\u00ednua. A capacidade m\u00e1xima de cada fundi\u00e7\u00e3o: a produ\u00e7\u00e3o de tubos, barras e perfis de pequeno e m\u00e9dio porte \u00e9 de cerca de 15 t. A produ\u00e7\u00e3o de tubos, barras e perfis de grande porte \u00e9 de cerca de 35.<\/p>\n

Por uma quest\u00e3o de conveni\u00eancia, tomaremos como exemplo um volume de fundi\u00e7\u00e3o de 15 t por lote. O tempo necess\u00e1rio para fundir um lote varia de acordo com as diferentes s\u00e9ries de ligas, os m\u00e9todos de fundi\u00e7\u00e3o e os di\u00e2metros dos lingotes fundidos.<\/p>\n

Para especifica\u00e7\u00f5es m\u00e9dias de ligas macias, como o intervalo de cristaliza\u00e7\u00e3o \u00e9 pequeno \u2014 geralmente entre 40 e 70 \u2103 \u2014, um lote de fundi\u00e7\u00e3o (comprimento da pe\u00e7a fundida de 6 a 8 m) leva cerca de 1 a 1,5 h. O intervalo de cristaliza\u00e7\u00e3o da liga dura 2024 \u00e9 de 136 \u2103; no caso da liga 7075, o intervalo de cristaliza\u00e7\u00e3o chega a 158 \u2103, sendo que esse intervalo aumenta. Nas mesmas condi\u00e7\u00f5es, o tempo de fundi\u00e7\u00e3o ser\u00e1 naturalmente prolongado, levando cerca de 3 h.<\/p>","protected":false},"excerpt":{"rendered":"

After refining in the static furnace, wait for 30 minutes, the bubbles generated by the refining in the melt, carry the hydrogen that diffuses into…<\/p>","protected":false},"author":1,"featured_media":10656,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10655","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nOnline Refining Filtration with Degassing and CFF Filtering System<\/title>\n<meta name=\"description\" content=\"For high-end products, online refining filtration is required to further purify the melt. 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