fundentes para fundi\u00e7\u00e3o de alum\u00ednio<\/a> s\u00e3o o cloreto e o fluoreto. O fluxo de cloreto consegue umedecer o \u00f3xido e derret\u00ea-lo bem, e a adi\u00e7\u00e3o de fluoreto ao fluxo de cloreto pode melhorar a capacidade de refino do fluxo.<\/p>\nA raz\u00e3o pela qual o fluoreto melhora a capacidade de refino \u00e9 que ele aumenta a tens\u00e3o interfacial entre o fundente e o metal fundido, al\u00e9m de potencializar a adsor\u00e7\u00e3o do fundente ao \u00f3xido; outra raz\u00e3o \u00e9 que o fluoreto apresenta maior reatividade com o alum\u00ednio fundido. Produtos de rea\u00e7\u00e3o tensoativos, como g\u00e1s de fluoreto de alum\u00ednio e s\u00f3dio l\u00edquido, s\u00e3o formados na interface do \u00f3xido, o que promove a elimina\u00e7\u00e3o dos \u00f3xidos. Quando tratado apenas com cloreto, produz-se apenas uma pequena quantidade de cloreto de alum\u00ednio gasoso; portanto, o efeito de refinamento n\u00e3o \u00e9 t\u00e3o bom quanto o obtido com o fluoreto.<\/p>\n
![\"\"](\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2021\/09\/Aluminium-Melt-Purification-Technology.jpg\")
<\/p>\n
As opera\u00e7\u00f5es de refino com fundente na fus\u00e3o do alum\u00ednio s\u00e3o realizadas de acordo com as normas. A temperatura de refino deve ser controlada no limite superior da temperatura de fundi\u00e7\u00e3o para melhorar o efeito de refino. A quantidade de fundente deve ser suficiente. Para produtos com requisitos mais elevados de pureza interna, a quantidade pode ser maior, sendo que a dosagem geralmente \u00e9 de 4 a 5 kg\/t de metal. Para produtos em geral, a dosagem \u00e9 de 2 a 3 kg\/t de metal. Ap\u00f3s a conclus\u00e3o do refinamento, a esc\u00f3ria \u00e9 removida imediatamente; em seguida, o fluxo de cobertura \u00e9 espalhado e deixado em repouso. O tempo de repouso varia de acordo com o produto. Para produtos importantes, o tempo de repouso n\u00e3o deve ser inferior a 30 minutos, e para produtos comuns, n\u00e3o deve ser inferior a 15 minutos.<\/p>","protected":false},"excerpt":{"rendered":"
The aluminium melting flux should be thoroughly dried beforehand, so as to remove the moisture, which can improve the refining effect and prevent explosion accidents…<\/p>","protected":false},"author":1,"featured_media":10347,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-10346","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fluxes"],"yoast_head":"\n
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