ISSN 2594-5327
55º Congresso anual — Vol. 55 , num. 1 (2000)
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Magnesium, in a molten state, requires some form of protection to inhibit oxidation and preventing burning. Since 1970s, fluxless melt protection based upon sulfur hexafluoride as the effective reagent in a cover atmosphere has been a boon to those in the industry who process molten magnesium and/or its alloys. This technology has been a major contributor to the growth of the magnesium casting alloy market during the last two decades. However, recently international concern over global warming has focused attention on sulfur hexafluoride, which is the most potent global warming gas. This resulted in a call for voluntary reductions in its emission. The industry has responded to environmental call by 1) improving the current process and 2) proposing to replace sulfur hexafluoride with alternative chemicals. Air Liquide has developed a new technology, which enables this industry to capture and re-use the sulfur hexafluoride from the process exhaust. Air Liquide has recently developed a patented membrane-based sulfur hexafluoride recycle system, which can capture more than 95% of this gas from the process exhausts, and at the same time, the system can concentrate sulfur hexafluoride from a few ppm to percentage level. This paper will review the options for the emission reductions, and discuss in detail the technology aspect of the Air Liquide’s on-site recycle system.
Magnesium, in a molten state, requires some form of protection to inhibit oxidation and preventing burning. Since 1970s, fluxless melt protection based upon sulfur hexafluoride as the effective reagent in a cover atmosphere has been a boon to those in the industry who process molten magnesium and/or its alloys. This technology has been a major contributor to the growth of the magnesium casting alloy market during the last two decades. However, recently international concern over global warming has focused attention on sulfur hexafluoride, which is the most potent global warming gas. This resulted in a call for voluntary reductions in its emission. The industry has responded to environmental call by 1) improving the current process and 2) proposing to replace sulfur hexafluoride with alternative chemicals. Air Liquide has developed a new technology, which enables this industry to capture and re-use the sulfur hexafluoride from the process exhaust. Air Liquide has recently developed a patented membrane-based sulfur hexafluoride recycle system, which can capture more than 95% of this gas from the process exhausts, and at the same time, the system can concentrate sulfur hexafluoride from a few ppm to percentage level. This paper will review the options for the emission reductions, and discuss in detail the technology aspect of the Air Liquide’s on-site recycle system.
Palavras-chave
Magnesium, hexafluoride, casting.
Magnesium, hexafluoride, casting.
Como citar
L, Y.E. David; Kapusta, Joel; Meimari, Magdy; Barney, John; Filho, Jader Ferreira Furtado.
A New Option for Emission Reduction of Sulfur Hexafluoride in Magnesium Melting: Capture and Recycle,
p. 1-10.
In: 55º Congresso anual,
Rio de Janeiro, Brasil,
2000.
ISSN: 2594-5327, DOI 10.5151/2594-5327-C00741
