Research on Porous Sprayer for Refining of Aluminium Melt

Abstract:

The relationship among the transfer coefficient of hydrogen, the size and the moving velocity of bubbles has been obtained according to the transfer model of hydrogen in aluminum melt. The experiments were carried out to invetstigate the degassing efficiency of a porous sprayer immersed in the molten aluminum. The results indicate that refining of molten aluminum can be conducted with a porous sprayer that was immersed in the melt at one end and was connected with inert gas at another end through a pipe. The refining efficiency is affected by number of bubbles or size of bubbles and by floating speed of bubbles. The hydrogen concentration in aluminium melt decreases with the increasing of the spraying time. In the condition of 0.6 m3/h flowing rate and spraying time of 10 minutes, the removal rates of hydrogen and impurities are about 60 percent and 68 percent，respectively for A357 casting aluminium alloy.

• Periodical: Advanced Materials Research (Volumes 418-420)
• Pages: 1856-1859
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.418-420.1856
• Online since: December 2011
• Authors: Cheng Gang Hao, De Zhi Li, Jian Min Zeng
• Keywords: Aluminium Melt, Porous Sprayer, Refining

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