{"id":6183,"date":"2020-11-04T09:03:43","date_gmt":"2020-11-04T09:03:43","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6183"},"modified":"2020-11-04T09:03:43","modified_gmt":"2020-11-04T09:03:43","slug":"granular-refining-agent","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/granular-refining-agent\/","title":{"rendered":"Agente de refino granular"},"content":{"rendered":"<p>O agente refinador granular apresenta boa remo\u00e7\u00e3o de esc\u00f3ria (\u00f3xido, boreto e carboneto) e de impurezas (elementos de metais alcalinos: Na, Ca e Li) na massa fundida de alum\u00ednio. O princ\u00edpio da remo\u00e7\u00e3o de esc\u00f3ria \u00e9 o seguinte: quando o agente refinador de part\u00edculas s\u00f3lidas \u00e9 pulverizado no alum\u00ednio fundido por meio de g\u00e1s inerte, as part\u00edculas s\u00f3lidas podem derreter rapidamente, formando got\u00edculas. Como a densidade dessas got\u00edculas \u00e9 menor do que a do alum\u00ednio fundido, a tens\u00e3o superficial das inclus\u00f5es de esc\u00f3ria \u00e9 menor. Ele possui forte capacidade de umedecer e adsorver as inclus\u00f5es de esc\u00f3ria; quando as inclus\u00f5es de esc\u00f3ria s\u00e3o adsorvidas pelas got\u00edculas de fluxo, elas flutuam para cima e s\u00e3o expelidas do metal fundido. Ao mesmo tempo, ap\u00f3s as got\u00edculas de fluxo flutuarem para cima, forma-se uma camada l\u00edquida que cobre a superf\u00edcie do alum\u00ednio fundido, reduzindo assim a perda por queima oxidativa do alum\u00ednio fundido. O princ\u00edpio de remo\u00e7\u00e3o de impurezas do Agente de Refinamento Granulado \u00e9 o seguinte: depois que o composto contendo \u00edons de magn\u00e9sio presente no agente de refinamento entra no alum\u00ednio fundido, ele reage com os elementos met\u00e1licos alcalinos Na, Ca e Li para liberar \u00e1tomos de magn\u00e9sio na liga de alum\u00ednio fundida e, ao mesmo tempo, absorve os elementos met\u00e1licos alcalinos Na, Ca e Li s\u00e3o levados \u00e0 superf\u00edcie do alum\u00ednio fundido, desempenhando assim a fun\u00e7\u00e3o de remo\u00e7\u00e3o de metais alcalinos.<\/p>\n<p>No processo de fundi\u00e7\u00e3o de ligas de alum\u00ednio, frequentemente s\u00e3o geradas inclus\u00f5es e gases, o que afeta significativamente a qualidade dos lingotes e dos produtos de alum\u00ednio. As inclus\u00f5es comuns incluem \u00f3xidos, carbonetos, nitretos, boretos, etc. Entre elas, os \u00f3xidos (como Al\u2082O\u2083, MgO) s\u00e3o os que mais contaminam a massa fundida da liga de alum\u00ednio. Essas inclus\u00f5es n\u00e3o apenas servem de suporte para o g\u00e1s, mas tamb\u00e9m aumentam o teor de g\u00e1s na massa fundida, causando defeitos, como inclus\u00f5es de esc\u00f3ria e porosidade no lingote. Al\u00e9m disso, as mat\u00e9rias-primas e os materiais auxiliares impuros utilizados na fundi\u00e7\u00e3o de ligas de alum\u00ednio tamb\u00e9m trazem algumas impurezas nocivas para a massa fundida, como metais alcalinos (Na, Ca, Li, etc.), que reduzem as propriedades f\u00edsico-qu\u00edmicas das ligas de alum\u00ednio. O elemento Na apresenta alto teor de Mg. A liga de alum\u00ednio causa facilmente \u201cfragiliza\u00e7\u00e3o por s\u00f3dio\u201d e tamb\u00e9m reduz a fluidez da massa fundida. Portanto, na produ\u00e7\u00e3o de materiais de liga de alum\u00ednio, existem regulamenta\u00e7\u00f5es rigorosas quanto ao teor de esc\u00f3ria, ao teor de g\u00e1s e ao teor de elementos impuros na massa fundida da liga de alum\u00ednio.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6184\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/11\/Granular-Refining-Agent-1.jpg\" alt=\"Agente de refino granular\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/11\/Granular-Refining-Agent-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/11\/Granular-Refining-Agent-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Para remover o g\u00e1s e as inclus\u00f5es da massa fundida de liga de alum\u00ednio, a ind\u00fastria de fus\u00e3o e fundi\u00e7\u00e3o de alum\u00ednio costuma utilizar uma mistura <a href=\"http:\/\/www.alalloycasting.com\/pt\/refining-agents\/\">agente refinador<\/a> de g\u00e1s inerte (N\u2082, Ar, etc.) e fluxo em p\u00f3 (NaCl, KCl, Na\u2082SiF\u2086, etc.), que \u00e9 pulverizado no forno de fus\u00e3o. M\u00e9todo de tratamento de purifica\u00e7\u00e3o por refino. Para remover elementos impuros nocivos (Na, Li, Ca), utiliza-se o refino com g\u00e1s contendo cloro. No entanto, esse processo tradicional de refino apresenta muitas defici\u00eancias, tais como: a gera\u00e7\u00e3o de grandes quantidades de gases nocivos e fuma\u00e7a contendo cloro e fl\u00faor, o que polui o meio ambiente; o agente de refino em p\u00f3 misturado permanece na forma s\u00f3lida na massa fundida, o que \u00e9 prejudicial \u00e0s inclus\u00f5es de esc\u00f3ria. O efeito de adsor\u00e7\u00e3o e dissolu\u00e7\u00e3o n\u00e3o \u00e9 evidente, e o efeito de desgaseifica\u00e7\u00e3o e remo\u00e7\u00e3o de esc\u00f3ria \u00e9 limitado. Se a opera\u00e7\u00e3o for inadequada, \u00e9 f\u00e1cil formar inclus\u00f5es de fundente e poluir a massa fundida de liga de alum\u00ednio; a rea\u00e7\u00e3o qu\u00edmica local em alta temperatura durante o processo de refino causar\u00e1 grave queima por oxida\u00e7\u00e3o do alum\u00ednio, entre outros problemas.<\/p>","protected":false},"excerpt":{"rendered":"<p>The granular refining agent has a good slag removal (oxide, boride, and carbide) and impurity removal (alkali metal elements Na, Ca, and Li) in the&hellip;<\/p>","protected":false},"author":1,"featured_media":6185,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120,138],"tags":[6091,6106,6116,6095,6115,6103,6104,6111,6114,6099,6107,6105,6097,6113,6094,6110,6100,6101,6102,6108,6093,6092,6112,6098,6109,6096],"class_list":["post-6183","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fluxes","category-seo","tag-granular-refining-agent-for-rusal","tag-granular-refining-agent-for-rusal-alumina","tag-granular-refining-agent-for-rusal-aluminium","tag-granular-refining-agent-for-rusal-aluminum","tag-granular-refining-agent-for-rusal-america","tag-granular-refining-agent-for-rusal-company","tag-granular-refining-agent-for-rusal-group","tag-granular-refining-agent-for-rusal-guyana","tag-granular-refining-agent-for-rusal-hong-kong","tag-granular-refining-agent-for-rusal-marketing","tag-granular-refining-agent-for-rusal-marketing-gmbh","tag-granular-refining-agent-for-rusal-news","tag-granular-refining-agent-for-rusal-plc","tag-granular-refining-agent-for-rusal-russia","tag-granular-refining-agent-for-rusal-stock-price","tag-granular-refining-agent-for-rusal-zug","tag-granular-refining-agent-for-russian-aluminium","tag-granular-refining-agent-for-russian-aluminium-company","tag-granular-refining-agent-for-russian-aluminum","tag-granular-refining-agent-for-russian-companies-in-ireland","tag-granular-refining-agent-for-russian-metal","tag-granular-refining-agent-for-uc-rusal","tag-granular-refining-agent-for-uc-rusal-latest-news","tag-granular-refining-agent-for-united-co-rusal","tag-granular-refining-agent-for-united-company-rusal","tag-granular-refining-agent-for-united-company-rusal-plc"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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