{"id":6865,"date":"2020-12-07T02:13:59","date_gmt":"2020-12-07T02:13:59","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6865"},"modified":"2020-12-07T02:13:59","modified_gmt":"2020-12-07T02:13:59","slug":"flux-for-molten-aluminium","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/flux-for-molten-aluminium\/","title":{"rendered":"Fluxo para alum\u00ednio fundido"},"content":{"rendered":"<p>Para remover os elementos de metais alcalinos (ou seja, Na, Ca, K, Li), o uso de g\u00e1s fluxante reativo contendo cloro \u00e9 um m\u00e9todo reconhecido para o processamento do alum\u00ednio fundido. Em condi\u00e7\u00f5es de equil\u00edbrio, os cloretos de cada um desses elementos s\u00e3o formados como produtos da rea\u00e7\u00e3o. Com exce\u00e7\u00e3o do LiCl, todos esses sais halogenados s\u00e3o esp\u00e9cies puras e se apresentam na forma s\u00f3lida \u00e0 temperatura normal de processamento; portanto, s\u00e3o facilmente separados para a superf\u00edcie da massa fundida e removidos por escumagem.<\/p>\n<p>Os elementos de metais alcalinos geralmente est\u00e3o presentes em concentra\u00e7\u00f5es na massa fundida inferiores a 500 ppm. De acordo com a lei da a\u00e7\u00e3o de massa, s\u00e3o gerados sais metaest\u00e1veis fora do equil\u00edbrio, como o AlCl\u2083. Esses halogenetos s\u00e3o indesej\u00e1veis, pois afetam significativamente a transmiss\u00e3o por via a\u00e9rea no processo. Al\u00e9m disso, o MgCl\u2082 funde a 1306\u00b0F e, geralmente, funde-se em temperaturas normais de processamento de fus\u00e3o. O sal fundido \u00e9 altamente indesej\u00e1vel, pois \u00e9 dif\u00edcil remov\u00ea-lo da superf\u00edcie por escuma\u00e7\u00e3o. Portanto, \u00e9 altamente desej\u00e1vel fazer reagir ou complexar os elementos alcalinos para produzir um sal com ponto de fus\u00e3o mais elevado, que seja separado de forma mais eficaz na forma s\u00f3lida por flota\u00e7\u00e3o at\u00e9 a superf\u00edcie.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6874\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/12\/Flux-for-Molten-Aluminium-1.jpg\" alt=\"Fluxo para alum\u00ednio fundido\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Flux-for-Molten-Aluminium-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/12\/Flux-for-Molten-Aluminium-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Ao dispersar o g\u00e1s de fluxo no alum\u00ednio fundido, o g\u00e1s \u00e9 introduzido no corpo principal de forma descendente, ao longo da dire\u00e7\u00e3o axial, e dispersado pelo impulsor girat\u00f3rio instalado no eixo. No entanto, esse m\u00e9todo n\u00e3o \u00e9 ilimitado. O impulsor rotativo produz um v\u00f3rtice ao redor do eixo, o que indica que a maior parte do metal fundido gira ou circula ao redor do eixo do impulsor a uma velocidade pr\u00f3xima \u00e0 do pr\u00f3prio impulsor. O fluxo adicionado ao metal fundido tende a circular junto com ele, com dispers\u00e3o m\u00ednima. Al\u00e9m disso, o v\u00f3rtice tem o efeito de aumentar a \u00e1rea de superf\u00edcie do metal fundido exposta ao ar. O aumento da exposi\u00e7\u00e3o do metal fundido ao ar leva a uma maior forma\u00e7\u00e3o de esc\u00f3ria. Quando o fluxo \u00e9 um g\u00e1s, o v\u00f3rtice pode causar problemas de outra forma. O g\u00e1s do metal fundido se move em dire\u00e7\u00e3o ao centro do v\u00f3rtice por separa\u00e7\u00e3o f\u00edsica e, como resultado, outras partes do metal fundido n\u00e3o s\u00e3o suficientemente tratadas pelo g\u00e1s. Portanto, como nenhuma parte do metal fundido \u00e9 tratada com o fluxo, a efic\u00e1cia desse m\u00e9todo \u00e9 reduzida. Al\u00e9m disso, o g\u00e1s de fluxo arrastado no padr\u00e3o de fluxo do metal fundido tende a se aglomerar, resultando na forma\u00e7\u00e3o de bolhas maiores de g\u00e1s de fluxo no metal fundido. Bolhas maiores reduzem a efici\u00eancia do fluxo, pois menos metal fundido \u00e9 tratado.<\/p>\n<p>Distribuir o material de fluxo de maneira uniforme por toda a massa fundida e aumentar o contato do metal fundido com o fluxo, o que pode melhorar a fluidez da massa fundida. Al\u00e9m disso, h\u00e1 uma grande necessidade de m\u00e9todos aprimorados de filtragem para metais fundidos, como o alum\u00ednio fundido. O filtro de espuma cer\u00e2mica \u00e9 amplamente utilizado para <a href=\"http:\/\/www.alalloycasting.com\/pt\/molten-aluminum-filtration\/\">filtragem de alum\u00ednio fundido<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>In order to remove alkali metal elements (ie Na, Ca, K, Li), the use of chlorine-containing reactive flux gas is a recognized method for processing&hellip;<\/p>","protected":false},"author":1,"featured_media":6875,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[138],"tags":[],"class_list":["post-6865","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seo"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Flux for Molten Aluminium -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"In order to remove alkali metal 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