Aluminum melt refining process, the refining volume, temperature control, standing time and other factors have an impact on the quality of aluminum alloy melt.
Aluminum Melt Refining Process
During the smelting process, tools and other factors have an impact on the quality of the aluminum alloy melt. It must be baked before use. It cannot be operated in a cold state and painted with protective coatings to prevent the metal from further absorbing hydrogen and increasing iron. The moisture content of the refining agent must be controlled below 0.3%, and the purity of the inert gas must be above 9999%.
The refining amount is 0.1-0.2% of the weight of the molten aluminum, which can also be determined according to the actual situation on site.
The refining process must be carried out at a specific temperature to realize the physical and chemical reactions in the melting process. The melting temperature is determined by the melting point of the alloy. The refining temperature of cast aluminum alloy is controlled at 700~740℃. The refining operation should not be lower than 700℃.
During the refining operation, it is possible to approach the bottom of the molten pool and drag it back and forth to make the refining agent fully contact with the molten aluminum to achieve the purpose of refining. During the refining operation, the operator can freely control the flow of carrier gas and refining agent through the barometer and the number of revolutions of the powder feeder. Thereby controlling the tumbling process of molten aluminum may reduce secondary pollution. The refining time is controlled within 0-15 minutes, and two refining are taken if necessary.
After the slagging operation is completed, heating or natural cooling operation is adopted according to the temperature in the furnace, and the aluminum liquid is statically treated. The standing time is generally controlled at 20-30 minutes.