{"id":4668,"date":"2019-04-15T03:04:39","date_gmt":"2019-04-15T03:04:39","guid":{"rendered":"http:\/\/www.adtechamm.com\/?p=4668"},"modified":"2019-06-03T09:09:18","modified_gmt":"2019-06-03T09:09:18","slug":"degassing-aluminum-indonesia","status":"publish","type":"post","link":"https:\/\/www.adtechamm.com\/es\/degassing-aluminum-indonesia\/","title":{"rendered":"Desgasificaci\u00f3n del aluminio en Indonesia"},"content":{"rendered":"

Desgasificaci\u00f3n del aluminio en Indonesia<\/strong><\/p>\n

Degassing Aluminum Indonesia In the rotary degassing method an inert or chemically inactive gas (Argon, Nitrogen) is purged through a rotating shaft and rotor.<\/p>\n

La energ\u00eda del eje giratorio provoca la formaci\u00f3n de un gran n\u00famero de burbujas finas, lo que proporciona una relaci\u00f3n superficie-volumen muy elevada.
\nLa gran superficie activa favorece una difusi\u00f3n r\u00e1pida y eficaz del hidr\u00f3geno en las burbujas de gas, lo que da lugar a una actividad equitativa del hidr\u00f3geno en las fases l\u00edquida y gaseosa.<\/p>\n

Rotary Degassing Aluminum Indonesia allows achieve more complete hydrogen removal as compared to the flux degassing.
\nAdditionally desgasificador rotativo<\/a> does not use harmful chlorine and fluorine containing salts.<\/p>\n

Rotary Degassing Aluminum Indonesia may also combine the functions of degassing and flux introduction.
\nEn este caso, el gas inerte act\u00faa como portador del fundente granulado. Este m\u00e9todo se denomina \u00abinyecci\u00f3n de fundente\u00bb.<\/p>\n

Advantages of flux injection<\/strong>
\nhigh effectiveness of flux action due to better mixing with the melt;
\nshort flux treatment time;
\ncontrollable flux introduction;
\nmore environmentally friendly method of fluxing.<\/p>\n

\"Aluminio<\/p>\n

Sources of hydrogen in molten aluminum<\/strong>
\natmosphere humidity;
\nwet metallic charge;
\nwet furnace lining (crucible, transfer ladles);
\nwet foundry instruments;
\nwet fluxes and other consumables;
\nfurnace fuel combustion products containing hydrogen.<\/p>\n

\"Desgasificaci\u00f3n<\/p>\n

Methods of hydrogen content estimation<\/strong>
\nSlow solidification. In this method a small portion of liquid aluminum (about 2 in3\/33 cm3) is poured into a cavity in a heated refractory brick. The alloy slowly solidifies and the released hydrogen is concentrated in the upper part of the casting in form of frozen bubbles. Quantity of the hydrogen bubbles at the sample surface is determined by the hydrogen concentration.
\nVacuum method. This quantitative method uses solidification of a sample portion of the aluminum alloy in a small crucible at low pressure. Hydrogen dissolved in the alloy starts to form a gaseous phase (a bubble) at a certain pressure. When the first bubble is formed both the pressure and the temperature are measured. These parameters are used for determination of the hydrogen content by means of numeric diagrams.<\/p>\n

Degassing by fluxes<\/strong>
\nFluxes composed of chlorine and fluorine containing salts are used for degassing molten aluminum alloys. Degassing fluxes are commonly shaped in form of tablets.
\nDegassing operation starts when a flux tablet is plunged by a clean preheated perforated bell to the furnace bottom. The flux components react with aluminum forming gaseous compounds (aluminum chloride, aluminum fluoride). The gas is bubbling and rising through the melt. Partial pressure of hydrogen in the formed bubbles is very low therefore it diffuses from the molten aluminum into the bubbles. The bubbles escape from the melt and the gas is then removed by the exhausting system.
\nThe process continues until bubbling ceases.<\/p>\n

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