{"id":4094,"date":"2020-08-24T07:13:27","date_gmt":"2020-08-24T07:13:27","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4094"},"modified":"2020-08-24T07:13:27","modified_gmt":"2020-08-24T07:13:27","slug":"molten-metal-purification","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/molten-metal-purification\/","title":{"rendered":"Purifica\u00e7\u00e3o de metal fundido"},"content":{"rendered":"

A purifica\u00e7\u00e3o do metal fundido \u00e9 importante para a fundi\u00e7\u00e3o. A qualidade do metal destinado \u00e0 fundi\u00e7\u00e3o e \u00e0 lamina\u00e7\u00e3o pode ser ainda mais aprimorada por meio da ado\u00e7\u00e3o de m\u00e9todos, equipamentos e medidas de gest\u00e3o para a purifica\u00e7\u00e3o do metal fundido. A purifica\u00e7\u00e3o do metal fundido pode ser realizada das seguintes formas e m\u00e9todos.<\/p>\n

Purifica\u00e7\u00e3o de metal fundido<\/h2>\n

Modo de transfer\u00eancia do material fundido: o modo de transfer\u00eancia do material fundido do forno para o forno est\u00e1tico foi aprimorado, e o modo de queda foi substitu\u00eddo pela forma de plano inclinado, a fim de evitar o aumento da oxida\u00e7\u00e3o e o agravamento da suc\u00e7\u00e3o de g\u00e1s causados pelo gotejamento. Ao mesmo tempo, evite que grandes \u00e1reas do material fundido fiquem expostas ao ar e aumentem a oxida\u00e7\u00e3o e a absor\u00e7\u00e3o de gases. Melhore o isolamento t\u00e9rmico da calha, utilize novos materiais, aumente a espessura da calha ou cubra-a. Encontre uma temperatura de fus\u00e3o adequada para evitar a queima na calha devido a uma temperatura de fus\u00e3o muito baixa, o que aumentaria a oxida\u00e7\u00e3o e a absor\u00e7\u00e3o de gases pelo material fundido.<\/p>\n

Refinamento em forno est\u00e1tico: ao aprimorar o tubo de refinamento ou controlar o fluxo e a press\u00e3o do meio de desgaseifica\u00e7\u00e3o, \u00e9 poss\u00edvel evitar a influ\u00eancia de bolhas em excesso no efeito de desgaseifica\u00e7\u00e3o. A fim de produzir folha de alum\u00ednio de alta qualidade, sugerem-se os seguintes m\u00e9todos para substituir o atual refinamento com g\u00e1s inerte \u00fanico, visando melhorar o efeito de purifica\u00e7\u00e3o da massa fundida.<\/p>\n

\"Purifica\u00e7\u00e3o<\/p>\n

Refinamento misto com fluxo de g\u00e1s: inje\u00e7\u00e3o de uma pequena quantidade de p\u00f3 de fluxo, formando uma pel\u00edcula de sal l\u00edquido na superf\u00edcie da bolha. A pel\u00edcula de \u00f3xido na superf\u00edcie da bolha se rompe, sendo adsorvida e dissolvida. O hidrog\u00eanio presente na massa fundida se difunde para dentro da bolha, o que melhora o efeito de desgaseifica\u00e7\u00e3o.<\/p>\n

CCl\u2084: O CCl\u2084 reage com o alum\u00ednio, produzindo AlCl\u2083, HCl, Cl\u2082 e outros gases ativos. O hidrog\u00eanio presente na massa fundida \u00e9 removido por meio de a\u00e7\u00f5es f\u00edsicas e qu\u00edmicas, o que melhora o efeito de refino.<\/p>\n

A mistura de refrigerantes fluorados e arg\u00f4nio \u00e9 utilizada no processo de refino: o cloro e o fl\u00faor (CCL\u2082F\u2082), produzidos pela decomposi\u00e7\u00e3o do Freon, podem reagir com elementos de ligas de alum\u00ednio para formar sais fundidos, como HCl, AlCl\u2083 e AlF\u2083, que atuam como fluxo de bolhas no processo de refino misto.<\/p>\n

O dispositivo de desgaseifica\u00e7\u00e3o on-line<\/a> introduz g\u00e1s protetor na c\u00e2mara para reduzir a absor\u00e7\u00e3o e a oxida\u00e7\u00e3o do hidrog\u00eanio. Ao otimizar a velocidade de rota\u00e7\u00e3o e melhorar a sa\u00edda de ar do rotor, as bolhas ficam mais finas e o efeito de desgaseifica\u00e7\u00e3o \u00e9 aprimorado.<\/p>\n

Para produzir algod\u00e3o revestido com folha de alum\u00ednio de alta qualidade, um filtro de malha grossa (como um filtro de 10-20 ppig) \u00e9 adicionado antes da desgaseifica\u00e7\u00e3o, a fim de melhorar a pureza da massa fundida, aumentar a taxa de difus\u00e3o do hidrog\u00eanio na massa fundida e melhorar o efeito da desgaseifica\u00e7\u00e3o em linha. Intensificar a limpeza e a substitui\u00e7\u00e3o de Caixa de filtro CFF<\/a> para garantir a forma e o tamanho da c\u00e2mara de filtragem e assegurar a efic\u00e1cia da filtragem.<\/p>","protected":false},"excerpt":{"rendered":"

Molten metal purification is important for foundry. The quality of casting and rolling metal can be further improved by adopting melt purification method, equipment and…<\/p>","protected":false},"author":1,"featured_media":4095,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[4512],"class_list":["post-4094","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo","tag-molten-metal-purification"],"yoast_head":"\nMolten Metal Purification by Degassing and Filtering System<\/title>\n<meta name=\"description\" content=\"Molten metal purification is important for foundry. The quality of casting metal can be further improved by degassing and filtering system.\" \/>\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\/molten-metal-purification\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Molten Metal Purification by Degassing and Filtering System\" \/>\n<meta property=\"og:description\" content=\"Molten metal purification is important for foundry. 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