How to effectively reduce the casting loss in the process of aluminum casting-SINO EQUIPMENT & REFRACTORY （JIANGSU）CO., LTD.

How to effectively reduce the casting loss in the process of aluminum casting

Release time:

2024-01-16

Aluminum casting is the process of converting liquid aluminum into aluminum ingots, bars or other shapes of finished products and semi-finished products through batching, stirring, standing, refining and slagging. Aluminum and aluminum alloy in the casting process will be due to oxidation, refining, slag and other reasons appear different degrees of loss. The so-called aluminum casting loss is aluminum and aluminum alloy in the smelting process due to oxidation, volatilization and interaction with the furnace wall, refining agent caused by non-recoverable metal loss and aluminum slag contained in the general term.

The greater the affinity of metal and oxygen, the greater the trend of oxidation degree and the higher the degree of oxidation; the higher the temperature, the greater the affinity of metal and oxygen, the greater the trend of oxidation degree and the higher the degree of oxidation; the smaller the decomposition pressure of oxide, the greater the affinity of metal and oxygen, the greater the trend of oxidation degree and the higher the degree of oxidation. In the melting temperature range, aluminum and oxygen affinity is very large, easy to be oxidized, after oxidation, the surface of the formation of Al2O3 film, when higher than 500 ℃ for metastable r-Al2O3, the metastable oxide film to stable oxide film transformation process, the volume shrinkage and further oxidation and cracking. With the increase of molten aluminum temperature and the extension of time, the oxide film grows faster, and the oxidation amount and thickness also increase significantly.

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