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Bubbling gas through a melt of aluminum reduces the amount of undesirable hydrogen, non-metallic inclusions and alkali metals, which increases the quality of the final product. The inert gas bubbles bring about excellent stirring that assists in homogenizing the temperature and chemical composition of the melt. The addition of a reactive substance such as Chlorine or Sulfur Hexafluoride to the inert gas will further improve the quality of the melt by reacting with and removing the unwanted hydrogen.
Linde Mix 14
Sulfur Hexafluoride (SF6) is mixed with inert argon or nitrogen, typically at 2.5% or 5%. Unlike chlorine, SF6 is non-toxic, non-corrosive and not listed as a carcinogen. Linde Mix 14 is widely preferred by foundries and secondary aluminum producers because it successfully degasses their aluminum, while reducing corrosion and the health concerns they face with chlorine. The Linde Mix 14 process is patented by Linde.
Main benefits for refining with Linde products:
- Removal of hydrogen leads to lower porosity
- Removal of non-metallic inclusions
- Removal of alkali metals
- Improved quality and properties of the final product
- Refining with Linde Mix 14 is friendly to the environment, non-toxic and non-corrosive
- Easy to use and easy to try
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