{"id":4252,"date":"2020-08-27T10:08:48","date_gmt":"2020-08-27T10:08:48","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4252"},"modified":"2020-08-27T10:08:48","modified_gmt":"2020-08-27T10:08:48","slug":"electrolytic-aluminum-liquid-features","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/electrolytic-aluminum-liquid-features\/","title":{"rendered":"Caracter\u00edsticas do alum\u00ednio eletrol\u00edtico l\u00edquido"},"content":{"rendered":"

As caracter\u00edsticas do alum\u00ednio l\u00edquido eletrol\u00edtico incluem alta temperatura, maior quantidade de inclus\u00f5es de oxida\u00e7\u00e3o, alto teor de hidrog\u00eanio e teores de metal e de s\u00f3dio.<\/p>\n

Caracter\u00edsticas do alum\u00ednio eletrol\u00edtico l\u00edquido<\/h2>\n

(1) A temperatura \u00e9 elevada. O processo de eletr\u00f3lise \u00e9 geralmente realizado a uma temperatura de 950-970 \u2103, determinada pelas propriedades da mistura fundida de criolita e alumina que comp\u00f5e o eletr\u00f3lito e a alumina; portanto, a temperatura do alum\u00ednio fundido na c\u00e9lula eletrol\u00edtica \u00e9 de pelo menos 940 \u2103. Essa temperatura elevada, aliada \u00e0 grande quantidade de alum\u00ednio l\u00edquido retirada da c\u00e9lula eletrol\u00edtica, proporciona tempo suficiente para manter o alum\u00ednio no estado l\u00edquido, e o tanque de armazenamento de alum\u00ednio pode ser transportado ap\u00f3s repetidas opera\u00e7\u00f5es de extra\u00e7\u00e3o de alum\u00ednio em v\u00e1rias c\u00e9lulas eletrol\u00edticas. At\u00e9 que o alum\u00ednio fundido na oficina de fundi\u00e7\u00e3o seja transferido para o forno de reten\u00e7\u00e3o, a alta temperatura acima de 850 \u2103 \u00e9 mantida.<\/p>\n

\"Caracter\u00edsticas<\/p>\n

(2) H\u00e1 muitas inclus\u00f5es de oxida\u00e7\u00e3o. Embora haja uma certa diferen\u00e7a de densidade entre o eletr\u00f3lito de sal fundido de criolita-al\u00famina e o alum\u00ednio l\u00edquido \u00e0 mesma temperatura (a densidade do primeiro \u00e9 de cerca de 21 g\/cm\u00b3, enquanto a do segundo \u00e9 de cerca de 23 g\/cm\u00b3), isso \u00e9 suficiente para garantir que o alum\u00ednio l\u00edquido e o eletr\u00f3lito fiquem em camadas. Mas, como a diferen\u00e7a \u00e9 muito pequena, uma pequena quantidade de eletr\u00f3lito ser\u00e1 inevitavelmente absorvida quando o alum\u00ednio for aspirado a v\u00e1cuo. Al\u00e9m da intensa agita\u00e7\u00e3o e circula\u00e7\u00e3o durante o processo de eletr\u00f3lise, o movimento brusco do alum\u00ednio l\u00edquido faz com que o alum\u00ednio se oxide novamente no espa\u00e7o do \u00e2nodo, resultando em um maior n\u00famero de inclus\u00f5es oxidadas na massa fundida de alum\u00ednio, incluindo o \u00f3xido de alum\u00ednio depositado no fundo da c\u00e9lula eletrol\u00edtica e o carboneto de alum\u00ednio produzido pela difus\u00e3o de carbono, o que eleva relativamente o teor das diversas inclus\u00f5es no alum\u00ednio l\u00edquido. AdTech Unidade de filtragem CFF<\/a>\u00a0\u00e9 utilizado para remover inclus\u00f5es de oxida\u00e7\u00e3o.<\/p>\n

(3) O teor de Fe e Si \u00e9 elevado. No processo de eletr\u00f3lise, as impurezas em forma de \u00f3xido de elementos com potenciais positivos, como SiO\u2082, Fe\u2082O\u2083, etc., s\u00e3o facilmente reduzidas, enquanto os elementos impuros reduzidos, como Fe e Si, entram diretamente no alum\u00ednio l\u00edquido, o que reduz a qualidade do alum\u00ednio. Essas impurezas prov\u00eam principalmente da alumina bruta, dos \u00e2nodos de carbono e das ferramentas operacionais. Especialmente quando se utiliza alumina nacional como mat\u00e9ria-prima, o teor de Si na alumina \u00e9 geralmente mais elevado do que no caso da alumina importada, devido ao tipo de min\u00e9rio e \u00e0 tecnologia de dessilicata\u00e7\u00e3o utilizada na China. Normalmente, o alum\u00ednio l\u00edquido cont\u00e9m (Si) 0,8%-10% e (Fe) 0,9%~1,1%.<\/p>\n

4) Alto teor de hidrog\u00eanio. Devido \u00e0s particularidades do processo de eletr\u00f3lise com pal\u00e1dio, \u00e9 inevit\u00e1vel que o alum\u00ednio fundido contenha g\u00e1s. O principal componente do g\u00e1s \u00e9 o hidrog\u00eanio, representando cerca de 70% a 90%, al\u00e9m de uma pequena quantidade de CO, CO\u2082, N\u2082 e CH\u2084. O rad\u00f4nio produzido pela decomposi\u00e7\u00e3o t\u00e9rmica dos hidrocarbonetos do \u00e2nodo \u00e9 dissolvido eletroquimicamente no \u00e2nodo. Depois que o H gerado migra para o c\u00e1todo, ele \u00e9 descarregado no c\u00e1todo, gerando hidrog\u00eanio. Al\u00e9m disso, o hidrog\u00eanio presente no ambiente circundante \u00e9 reduzido pelo vapor de \u00e1gua proveniente do alum\u00ednio, dissolvendo-se no alum\u00ednio. No estado l\u00edquido, o teor de hidrog\u00eanio saturado no alum\u00ednio l\u00edquido aumenta com o aumento da temperatura. Por exemplo, \u00e9 de 0,67 mL\/100 gAl a 660 \u2103, 1,23 mL\/100 gAl a 750 \u2103 e 2,15 mL\/100 gAl a 850 \u2103. \u00c9 de 2,9 mL\/100 gAl a 950 \u2103 e de 3,9 mL\/100 gAl a 1.000 \u2103. A AdTech oferece unidade de desgaseifica\u00e7\u00e3o online<\/a> para a remo\u00e7\u00e3o de hidrog\u00eanio.<\/p>\n

\"Caracter\u00edsticas<\/p>\n

(5) Alto teor de Na. Durante o processo de eletr\u00f3lise, por um lado, o alum\u00ednio substitui o Na da criolita (NaAF\u2086), do fluoreto de s\u00f3dio (NaF) e de outros meios. Por outro lado, como a atividade do s\u00f3dio na massa fundida \u00e9 maior do que a do alum\u00ednio, h\u00e1 s\u00f3dio no c\u00e1todo. A precipita\u00e7\u00e3o passa para o alum\u00ednio l\u00edquido, de modo que o teor de s\u00f3dio no alum\u00ednio l\u00edquido atinge valores entre 0,011% e 0,05%.<\/p>","protected":false},"excerpt":{"rendered":"

Electrolytic aluminum liquid features include high temperature, more oxidation inclusions, high hydrogen content, and metal and Na content. Electrolytic Aluminum Liquid Features (1) The temperature…<\/p>","protected":false},"author":1,"featured_media":4254,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4622],"class_list":["post-4252","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-electrolytic-aluminum-liquid-features"],"yoast_head":"\nElectrolytic Aluminum Liquid Features in Aluminum Furnace<\/title>\n<meta name=\"description\" content=\"Electrolytic aluminum liquid features include high temperature, more oxidation inclusions, high hydrogen content, and metal and Na content.\" \/>\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\/electrolytic-aluminum-liquid-features\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta 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