{"id":5667,"date":"2020-10-16T05:29:34","date_gmt":"2020-10-16T05:29:34","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=5667"},"modified":"2020-10-26T03:45:26","modified_gmt":"2020-10-26T03:45:26","slug":"refining-agents","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/refining-agents\/","title":{"rendered":"Agentes de refino"},"content":{"rendered":"<p>O princ\u00edpio do m\u00e9todo de flota\u00e7\u00e3o consiste em injetar um g\u00e1s inerte (geralmente nitrog\u00eanio, arg\u00f4nio ou o g\u00e1s produzido pela adi\u00e7\u00e3o de sais) no alum\u00ednio l\u00edquido para gerar um grande n\u00famero de bolhas. Como a press\u00e3o parcial do hidrog\u00eanio nas bolhas \u00e9 zero, a diferen\u00e7a na press\u00e3o parcial de hidrog\u00eanio entre o alum\u00ednio l\u00edquido e as bolhas far\u00e1 com que o hidrog\u00eanio continue a se difundir para dentro das bolhas e estas subam at\u00e9 a superf\u00edcie do l\u00edquido. Ao mesmo tempo, devido \u00e0 diferen\u00e7a de molhabilidade, as inclus\u00f5es no alum\u00ednio fundido podem ser adsorvidas pelas bolhas em contato com ele e, em seguida, flutuar para cima e serem eliminadas, de modo a atingir o objetivo de remover o hidrog\u00eanio e as inclus\u00f5es. De acordo com os diferentes agentes de refino, o m\u00e9todo de flutua\u00e7\u00e3o \u00e9 dividido em m\u00e9todo do nitrog\u00eanio, m\u00e9todo do arg\u00f4nio, m\u00e9todo do cloro e m\u00e9todo de refino com sal de cloreto.<\/p>\n<p>Refinamento com nitrog\u00eanio: O nitrog\u00eanio \u00e9 barato e frequentemente utilizado para o refinamento de ligas de alum\u00ednio. Mas sua desvantagem \u00e9: para evitar a forma\u00e7\u00e3o de um grande n\u00famero de inclus\u00f5es de nitretos (como AN, Mg\u2083N\u2082, etc.), a temperatura de tratamento \u00e9 baixa (700~730 \u2103), o que limita a capacidade de difus\u00e3o do hidrog\u00eanio. Os resultados experimentais mostram que o nitrog\u00eanio exige alta pureza, e a presen\u00e7a de tra\u00e7os de oxig\u00eanio e umidade reduz significativamente o efeito de refino. Alguns dados indicam que um teor de oxig\u00eanio de 0,5% pode reduzir o efeito de desgaseifica\u00e7\u00e3o em 40%.<\/p>\n<p>Refinamento com arg\u00f4nio: A temperatura de refinamento pode ser aumentada para 760 \u2103, o que \u00e9 ben\u00e9fico para melhorar a capacidade de difus\u00e3o do hidrog\u00eanio. Al\u00e9m disso, o teor de oxig\u00eanio nos cilindros industriais de arg\u00f4nio \u00e9 baixo (0,005%~0,05%), e a densidade do arg\u00f4nio \u00e9 de 1,78 kg\/m\u00b3, o que \u00e9 superior \u00e0 densidade do oxig\u00eanio, de 1,25 kg\/m\u00b3. Durante o refinamento com arg\u00f4nio, o arg\u00f4nio se concentra na superf\u00edcie do banho de alum\u00ednio fundido, o que pode impedir a rea\u00e7\u00e3o entre o alum\u00ednio fundido e o g\u00e1s do forno, resultando em um melhor efeito de refinamento.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5671\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/10\/Refining-Agents-2.jpg\" alt=\"Agentes de refino\" width=\"400\" height=\"320\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/10\/Refining-Agents-2.jpg 400w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/10\/Refining-Agents-2-300x240.jpg 300w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/p>\n<p>Refinamento com cloro: Embora o cloro seja insol\u00favel no alum\u00ednio fundido, o cloro, como g\u00e1s ativo, pode reagir violentamente com o alum\u00ednio fundido e com o hidrog\u00eanio dissolvido nele, produzindo HCl e AlCl\u2083 gasosos, que s\u00e3o insol\u00faveis no alum\u00ednio fundido e n\u00e3o participam do processo. As amostras de cloro que reagiram t\u00eam um efeito de refino, de modo que o efeito de refino \u00e9 muito melhor do que o do nitrog\u00eanio. No entanto, o cloro \u00e9 um g\u00e1s altamente t\u00f3xico, prejudicial \u00e0 sa\u00fade humana, corrosivo para instala\u00e7\u00f5es e equipamentos, e o dispositivo de ventila\u00e7\u00e3o de cloro \u00e9 mais complexo. Portanto, geralmente n\u00e3o \u00e9 utilizado sozinho, mas em combina\u00e7\u00e3o com Ar ou N\u2082. O efeito de refinamento \u00e9 bom e \u00e9 adequado para pe\u00e7as fundidas com requisitos extremamente rigorosos quanto \u00e0 presen\u00e7a de poros min\u00fasculos.<\/p>\n<p>Atualmente, <a href=\"http:\/\/www.alalloycasting.com\/pt\/fluxes\/\">fluxos de refino granular<\/a> t\u00eam sido utilizados em pesquisas no pa\u00eds e no exterior com bons resultados. Devido ao efeito de ebuli\u00e7\u00e3o do N\u2082 e do CO\u2082 gerados pela rea\u00e7\u00e3o, o hidrog\u00eanio e as inclus\u00f5es n\u00e3o met\u00e1licas s\u00e3o removidos do alum\u00ednio fundido \u00e0 medida que as bolhas sobem \u00e0 superf\u00edcie; portanto, o efeito de desgaseifica\u00e7\u00e3o dessa mistura \u00e9 bom. Durante a refina\u00e7\u00e3o, utilize uma camp\u00e2nula para pressionar os agentes de refina\u00e7\u00e3o no alum\u00ednio fundido; a opera\u00e7\u00e3o \u00e9 a mesma que na refina\u00e7\u00e3o com sal de cloreto. A temperatura de refina\u00e7\u00e3o \u00e9 de 740 a 750 \u2103, e a quantidade \u00e9 de cerca de 0,61 TP3T a 0,81 TP3T da massa do alum\u00ednio fundido. A quantidade real do agente de refina\u00e7\u00e3o depende da qualidade do alum\u00ednio fundido, do tipo de liga e da cobertura do alum\u00ednio fundido.<\/p>","protected":false},"excerpt":{"rendered":"<p>The principle of the floatation method is to pass an inert gas (usually nitrogen, argon or the gas produced by adding salts) into the aluminum&hellip;<\/p>","protected":false},"author":1,"featured_media":5668,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[5952,5951,5953,5954,5963,5964,5962,5955,5965,5956,5957,5948,5949,5950,5967,5961,5966,5959,5958,5960,5969,5968],"class_list":["post-5667","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-refining-agents-for-aluminium-empire-myanmar","tag-refining-agents-for-aluminium-factory-in-myanmar","tag-refining-agents-for-aluminium-scrap-myanmar","tag-refining-agents-for-aluminium-thailand","tag-refining-agents-for-aluminum-thailand","tag-refining-agents-for-alva-aluminum-thailand","tag-refining-agents-for-asahi-tec-aluminium-thailand","tag-refining-agents-for-fletcher-aluminium-thailand","tag-refining-agents-for-hal-aluminum-thailand","tag-refining-agents-for-lynn-aluminium-thailand","tag-refining-agents-for-meyer-aluminium-thailand","tag-refining-agents-for-myanmar-aluminium","tag-refining-agents-for-myanmar-aluminium-industry","tag-refining-agents-for-myanmar-aluminium-industry-co-ltd","tag-refining-agents-for-nikkei-mc-aluminium","tag-refining-agents-for-nikkei-siam-aluminium-thailand","tag-refining-agents-for-rec-aluminum-thailand","tag-refining-agents-for-reynaers-aluminium-thailand","tag-refining-agents-for-schimmer-aluminium-thailand","tag-refining-agents-for-sms-aluminium-thailand","tag-refining-agents-for-thailand-aluminum","tag-refining-agents-for-united-aluminum-thailand"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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