{"id":4251,"date":"2019-02-14T01:39:55","date_gmt":"2019-02-14T01:39:55","guid":{"rendered":"http:\/\/www.adtechamm.com\/?p=4251"},"modified":"2024-05-23T05:57:23","modified_gmt":"2024-05-23T05:57:23","slug":"degassing-methods","status":"publish","type":"post","link":"https:\/\/www.adtechamm.com\/es\/degassing-methods\/","title":{"rendered":"M\u00e9todos de desgasificaci\u00f3n del aluminio"},"content":{"rendered":"

M\u00e9todos de desgasificaci\u00f3n del aluminio<\/h2>\n

Aluminum is a metal used often for its relative strength given its light weight. When aluminum is cast, however, impurities known as inclusions can create weak points in the product. There are several causes for these inclusions, but one of the most prevalent is the presence of hydrogen. Hydrogen gas is soluble in liquid aluminum, and it can pass through molten aluminum almost as easily as it passes through air. As the liquid metal cools and hardens, the hydrogen flows from high to low-pressure areas. It coalesces and creates pockets of gas which, when the metal solidifies, become inclusions and weak points. Degassing is a process used to remove hydrogen from the molten aluminum.<\/strong><\/p>\n

How hydrogen is introduced<\/h2>\n

Hydrogen can be introduced into liquid aluminum through combustion in gas furnaces, condensation on tools, fluxes, and alloy additives. Most commonly, however, hydrogen is introduced into molten aluminum via atmospheric humidity. Dissolution of hydrogen increases with an increase in atmospheric relative humidity.<\/strong><\/p>\n

M\u00e9todos de desgasificaci\u00f3n<\/h2>\n

As the demand for higher-quality aluminum products increases, especially in the aerospace industry, so does the need to reduce the occurrence of inclusions in molded products. A popular hydrogen removal method involves introducing bubbled nitrogen gas into the liquid aluminum. The hydrogen is drawn to the nitrogen bubbles, then carried up through the aluminum and released on the surface. Argon is also very effective, but because of the high costs associated with this gas, nitrogen is preferred.<\/strong><\/p>\n

Nitrogen gas is introduced into the molten metal either by way of a static lance or a rotating impeller. The static lance method is less expensive, but also less efficient than a rotating impeller, especially in humid environments.<\/strong><\/p>\n

Degassing Methods-Static lance<\/h2>\n

The static lance is a pipe that is inserted into a pot of liquid aluminum. Large nitrogen bubbles are released from the end of the lance and travel up through the product. When exposed to humid air, the large bubbles break the surface and attract more moisture that is dissociated into hydrogen and oxygen. The hydrogen then re-dissolves into the aluminum.<\/strong><\/p>\n

Degassing Methods-Rotary impeller<\/h2>\n

A rotary impeller works by increasing the surface area of the inert gas introduced into the metal. The smaller nitrogen bubbles created by the impeller process have a much greater overall surface area and collect more of the hydrogen. The lower surface disturbance of the smaller bubbles also allows for less hydrogen to be recaptured in the metal from the humidity in the atmosphere.<\/strong><\/p>\n

\"M\u00e9todos\"M\u00e9todos<\/p>\n

Adtech Degassing Methods – In line Degassing Unit<\/a> \u2013 sales@adtechamm.com<\/strong>
\nIt is mainly used for the hydrogen (H) and slag removal from molten aluminum.<\/strong><\/p>\n

Se basa en el principio de flotaci\u00f3n por gas. El rotor introduce gas inerte o una mezcla de cloro y gas inerte en el aluminio fundido y fragmenta el gas en diminutas burbujas dispersas; estas burbujas ascienden hasta la superficie del aluminio fundido y, al mismo tiempo, completan los procedimientos que se indican a continuaci\u00f3n:<\/strong><\/p>\n

El H se est\u00e1 absorbiendo en las burbujas y se est\u00e1 eliminando.<\/strong>
\nSe elimina el cloruro (formado por reacci\u00f3n qu\u00edmica entre un metal alcalino y el cloro gaseoso).<\/strong>
\nRetirar las escorias.<\/strong><\/p>\n

Adtech Degassing Methods Instruction<\/h2>\n

Switch off the heating unit after degassing box heating is completed. Guide inert gas into the rotor and release molten aluminum into the box when the heater temperature is close to the molten aluminum temperature.<\/strong>
\nCheck the sealing between the inlet\/outlet and launder.<\/strong>
\nComprueba el cono situado en el sistema de drenaje de la protecci\u00f3n t\u00e9rmica, en la parte inferior.<\/strong>
\nCheck the molten aluminum temperature (min 720\u00b0C). Make the height of molten aluminum away from the launder bottom at 3cm to observe the molten aluminum going into the box.<\/strong>
\nEl operario deber\u00e1 llevar ropa de protecci\u00f3n para cerrar la tapa. La escoria de la superficie se puede retirar a trav\u00e9s de la salida de desescoriado cuando el aluminio fundido fluye hacia la cubeta.<\/strong>
\nInicie la producci\u00f3n cuando la temperatura alcance los 780 \u00b0C. Cierre la salida de desescoriado para mantener el calor.<\/strong>
\nMolten aluminum can be retained in the box with a setting temperature during the heat preservation phase but with no molten aluminum handling.<\/strong>
\nIntroduce gases inertes en el rotor para evitar que el aluminio fundido obstruya la salida de aire.<\/strong>
\nSwitch on the heater as soon as molten aluminum flows into the box and set heat preservation parameters.<\/strong>
\nStarting the heating system, controlling the temperature of the molten aluminum, and monitoring the gas flow rate, the speed of the rotor is changed from the heat preservation stage to the processing stage. At the same time, the inert gas flow into the rotor increases, and the gas flow rate is changed from the preservation stage to the processing stage.<\/strong>
\nEl operario ajusta la temperatura de calentamiento del aluminio fundido y mantiene unas condiciones de trabajo estables para la desgasificaci\u00f3n.<\/strong><\/p>\n

Vida \u00fatil de la unidad de desgasificaci\u00f3n en l\u00ednea:<\/strong><\/p>\n

Lining\u22652years;<\/strong>
\nLa unidad completa, excepto las piezas de desgaste: \u22655 a\u00f1os.<\/strong><\/p>","protected":false},"excerpt":{"rendered":"

Aluminum Degassing Methods Aluminum is a metal used often for its relative strength given its light weight. When aluminum is cast, however, impurities known as inclusions can create weak points in the product. There are several causes for these inclusions, but one of the most…<\/p>","protected":false},"author":1,"featured_media":4253,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[52],"tags":[8557,8562,8573,8565,8569,8571,8570,8564,8572,8549,8567,8568,8566,8551,8585,8587,8583,8584,8586,8577,8575,8579,8578,8574,8576,8582,8581,8580,8550,8547,8546,8554,8553,8552,8555],"yoast_head":"\nAluminum Degassing Methods - Adtech - sales@adtechamm.com<\/title>\n<meta name=\"description\" content=\"Degassing Methods As the demand for higher quality aluminum products increases, especially in the aerospace industry, so does the need to reduce...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.adtechamm.com\/es\/degassing-methods\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Aluminum Degassing Methods - 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