{"id":10539,"date":"2021-10-12T08:13:40","date_gmt":"2021-10-12T08:13:40","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10539"},"modified":"2021-10-12T08:13:40","modified_gmt":"2021-10-12T08:13:40","slug":"wall-cleaning-fluxes","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/wall-cleaning-fluxes\/","title":{"rendered":"Fundentes para la limpieza de paredes"},"content":{"rendered":"

Los fundentes de limpieza de paredes ayudan a mantener las paredes del crisol y del horno, tanto por encima como por debajo de la l\u00ednea de fusi\u00f3n, libres de acumulaciones de \u00f3xido. Esto reduce tanto el desperdicio de aleaci\u00f3n como otra fuente de inclusiones no deseadas.<\/p>\n

Los fundentes de limpieza de paredes ablandan los \u00f3xidos acumulados en las paredes del horno. Estos fundentes contienen fluoruros dobles (Na\u2082SiF\u2086, Na\u2082AlF\u2086) y un agente oxidante. El agente oxidante reacciona con el aluminio generando calor, lo que favorece la penetraci\u00f3n de los fluoruros en los \u00f3xidos acumulados, abland\u00e1ndolos. Los \u00f3xidos ablandados pueden ser retirados f\u00e1cilmente de la pared por el operario del horno.<\/p>\n

Los fundentes de limpieza eliminan los \u00f3xidos suspendidos en el aluminio fundido. De forma similar a los Fundentes de desbaste<\/a>, el fundente de limpieza est\u00e1 compuesto por una mezcla de cloruros, fluoruros y un agente oxidante. Los fundentes de limpieza generan menos calor, por lo que su efecto de separaci\u00f3n del aluminio es menor. Sin embargo, tienen una mayor capacidad para absorber las inclusiones de \u00f3xidos de la masa fundida.<\/p>\n

La pr\u00e1ctica habitual para la introducci\u00f3n del fundente es la aplicaci\u00f3n manual. La mayor\u00eda de los fundentes se aplican sobre la superficie de la masa fundida y se mezclan con ella. Algunos fundentes (para desgasificaci\u00f3n y refinado de grano) se introducen hasta el fondo mediante una campana perforada, limpia y precalentada.<\/p>\n

\"\"<\/p>\n

Los fundentes tambi\u00e9n pueden introducirse en la masa fundida mediante inyecci\u00f3n, en forma de polvo transportado por una corriente de gas inerte (arg\u00f3n o nitr\u00f3geno). La t\u00e9cnica m\u00e1s sencilla de inyecci\u00f3n de fundente consiste en sumergir una lanza en la masa fundida. El m\u00e9todo m\u00e1s eficaz para introducir fundente es la inyecci\u00f3n mediante un desgasificador rotativo.<\/p>\n

Haga pasar nitr\u00f3geno (a una presi\u00f3n de 1,2\uff5e1,8 kg\/cm\u00b2) y, a continuaci\u00f3n, abra la v\u00e1lvula situada debajo del dep\u00f3sito de refinado. El gas utilizado es nitr\u00f3geno de alta pureza 99,991 TP3T. Es preferible que la presi\u00f3n del nitr\u00f3geno durante el refinado sea lo suficientemente alta como para expulsar el polvo. La cantidad de agente refinador es de aproximadamente 0,15\uff5e0,201 TP3T.<\/p>\n

La temperatura de refinado se mantiene entre unos 730 y 750 grados Celsius, y la escoria se puede retirar tras dejar reposar el aluminio durante 20 minutos despu\u00e9s del refinado. Intenta evitar agitar el aluminio fundido al retirar la escoria, para que esta no quede atrapada en el aluminio fundido; a continuaci\u00f3n, utiliza el agente de recubrimiento para fundir la superficie y evitar que el cuerpo se vuelva a oxidar y absorba.<\/p>","protected":false},"excerpt":{"rendered":"

Wall cleaning fluxes help keep crucible and furnace walls above and below the melt line free of oxide build-up. This reduces both alloy wastage and…<\/p>","protected":false},"author":1,"featured_media":10540,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-10539","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fluxes"],"yoast_head":"\nWall Cleaning Fluxes for Aluminum Melting -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Wall cleaning fluxes help keep crucible and furnace walls free of oxide build-up. 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