{"id":5078,"date":"2020-09-25T06:13:29","date_gmt":"2020-09-25T06:13:29","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5078"},"modified":"2020-09-25T06:13:29","modified_gmt":"2020-09-25T06:13:29","slug":"online-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/online-refining\/","title":{"rendered":"Refino online"},"content":{"rendered":"<p>No processo de fundi\u00e7\u00e3o e lamina\u00e7\u00e3o de barras de liga de alum\u00ednio de alta resist\u00eancia \u00e0 base de alum\u00ednio, magn\u00e9sio e sil\u00edcio, o uso de equipamentos de refino em linha para desgaseifica\u00e7\u00e3o e filtra\u00e7\u00e3o por placas de filtro cer\u00e2micas alveolares tem se tornado cada vez mais comum.<\/p>\n<p>O dispositivo de refino em linha do alum\u00ednio fundido foi inventado pela primeira vez pela United Carbide Corporation em 1974. Seu princ\u00edpio de funcionamento consiste em injetar g\u00e1s inerte de alta pureza no alum\u00ednio l\u00edquido por meio de um bocal de grafite com rotor girat\u00f3rio de alta velocidade, a fim de formar um grande n\u00famero de bolhas dispersas. O l\u00edquido entra em contato total com o g\u00e1s, e o hidrog\u00eanio presente no alum\u00ednio fundido \u00e9 difundido para dentro das bolhas; \u00e0 medida que as bolhas sobem, o alum\u00ednio fundido \u00e9 expelido, realizando assim o processo de desgaseifica\u00e7\u00e3o. Ao mesmo tempo, quando as pequenas bolhas sobem, devido ao mecanismo de adsor\u00e7\u00e3o por tens\u00e3o superficial, algumas pequenas inclus\u00f5es podem ser adsorvidas, permitindo a remo\u00e7\u00e3o de esc\u00f3ria.<\/p>\n<p>O dispositivo de refino online com rotor de grafite rotativo e pulveriza\u00e7\u00e3o \u00e9 utilizado para desgaseifica\u00e7\u00e3o. O rotor de grafite, que gira em alta velocidade, serve para fragmentar o g\u00e1s inerte injetado no alum\u00ednio l\u00edquido em bolhas muito pequenas, o que aumenta consideravelmente a \u00e1rea de contato entre as bolhas de g\u00e1s inerte e o alum\u00ednio l\u00edquido, e melhora a efici\u00eancia da desgaseifica\u00e7\u00e3o; sob a premissa de uso de g\u00e1s inerte de alta pureza, pode reduzir o teor de hidrog\u00eanio para menos de 0,12 ml por 100 g de alum\u00ednio. Atualmente, \u00e9 um dispositivo de desgaseifica\u00e7\u00e3o em linha amplamente utilizado. A filtragem on-line do alum\u00ednio fundido inclui principalmente: filtragem por tecido de vidro, filtragem por placas cer\u00e2micas de espuma, filtragem tubular e filtragem em leito profundo.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5121\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Online-Refining-1.jpg\" alt=\"Refino online\" width=\"400\" height=\"500\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Online-Refining-1.jpg 400w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Online-Refining-1-240x300.jpg 240w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<p>A filtragem do alum\u00ednio fundido por meio de tela de fibra de vidro pertence ao tipo de filtragem grosseira em tela plana, que separa mecanicamente as inclus\u00f5es grossas por meio da a\u00e7\u00e3o de barreiras, mas n\u00e3o consegue remover as inclus\u00f5es finas. Esse m\u00e9todo foi eliminado ou \u00e9 utilizado apenas como filtragem grosseira prim\u00e1ria na sa\u00edda do forno.<\/p>\n<p>Atualmente, o m\u00e9todo mais utilizado e mais eficaz para filtrar e remover impurezas \u00e9 o uso de <a href=\"http:\/\/www.alalloycasting.com\/pt\/foam-ceramic-filters\/\">filtro cer\u00e2mico de espuma<\/a> placas. O alum\u00ednio l\u00edquido flui atrav\u00e9s dos orif\u00edcios sinuosos da cer\u00e2mica, e as part\u00edculas de inclus\u00e3o contidas na placa cer\u00e2mica ficam retidas nela sob os tr\u00eas efeitos de bloqueio, deposi\u00e7\u00e3o e adsor\u00e7\u00e3o. A superf\u00edcie interna do orif\u00edcio e as fendas formam uma cavidade, de modo que as part\u00edculas de inclus\u00e3o s\u00e3o separadas do alum\u00ednio l\u00edquido.<\/p>\n<p>A placa filtrante de espuma cer\u00e2mica \u00e9 um produto padr\u00e3o, com espessura de 2 pol. (1 pol. = 0,0254 m), comprimento e largura iguais e um \u00e2ngulo de inclina\u00e7\u00e3o lateral de 17,5\u00b0. O comprimento diagonal \u00e9 geralmente usado para definir as especifica\u00e7\u00f5es, e a porosidade da placa filtrante \u00e9 expressa em PPI. Quanto maior o PPI, menores s\u00e3o os poros. A porosidade da placa filtrante determina a precis\u00e3o final da filtragem. Quanto menor for a vaz\u00e3o do alum\u00ednio l\u00edquido na placa filtrante, melhor ser\u00e1 o efeito de filtragem.<\/p>","protected":false},"excerpt":{"rendered":"<p>In the process of casting and rolling of aluminum-magnesium-silicon high-strength aluminum alloy rods, the use of online refining equipment for degassing and foam ceramic filter&hellip;<\/p>","protected":false},"author":1,"featured_media":5122,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5078","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Online Refining by Degassing Sysytem and CFF Filtering System<\/title>\n<meta name=\"description\" content=\"The use of online refining equipment for degassing and 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