Process for treating molten aluminum with chlorine gas and sulfu

Details Process for treating molten aluminum with chlorine gas and sulfu Process for treating molten aluminum with chlorine gas and sulfu

1995-05-03

1996-07-16

Andrews, Melvyn

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

420542, C22B 2106

Patent

active

055362966

ABSTRACT:
There is disclosed an improved process for treating molten aluminum or aluminum alloys containing impurities, such as alkali metals, alkaline earth metals and hydrogen, to reduce the amount of impurities contained therein by in-line rotor degassing. The process comprising the sequential steps of: (a) contacting said molten aluminum or aluminum alloy with chlorine gas by rotor injection; and (b) contacting the molten aluminum or aluminum alloy with a mixture of chlorine gas and sulfur hexafluoride gas by rotor injection, wherein the chlorine gas flow rate in step (a) is between approximately 0.005 to 0.025 scfm and the gas flow rate in step (b) is a combination of a sulfur hexafluoride gas flow rate of between approximately 0.012 and 0.032 scfm and a chlorine gas flow rate of between approximately 0.005 to 0.025 scfm and wherein the ratio of sulfur hexafluoride flow to chlorine gas flow in step (b) is between approximately 1.25 and 2.5 by volume for a molten aluminum or aluminum alloy flow rate of between approximately 620 and 810 lbs/min.

REFERENCES:
patent: 4138245 (1979-02-01), Stary
patent: 4668351 (1987-05-01), Dewing et al.
patent: 4959101 (1990-09-01), MacNeal et al.
patent: 4992241 (1991-02-01), Provencher et al.
patent: 5145514 (1992-09-01), Gariepy et al.

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