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1769922 
Book/Book Chapter 
Chloride salt injection to replace chlorine in the Alcoa A622 degassing process 
Chesonis, DC; Deyoung, DH 
2008 
LIGHT METALS 
569-574 
WOS:000255981900101 
Rotating impeller degassers. like the Alcoa A622 typically inject a mixture of Ar and Cl(2) to treat the metal as it flows from the furnace to the casting pit. The use of gaseous Cl(2) represents a significant environmental and industrial hygiene issue, Storage, piping, safety, and training requirements can be stringent. Eliminating the use of Cl, requires the development of alternative methods to remove alkali and alkaline earth impurities and to maintain metal cleanliness.



Static and dynamic tests were conducted to evaluate the feasibility of using solid salts containing MgCl(2) to replace Cl(2) in an A622 degasser. This paper will present comparisons between Cl, injection and salt injection for Na, Ca, and H(2) removal, utilization efficiency of the injected reactant, metal cleanliness measured by LiMCA and PoDFA, and emissions of particulate, Cl(2), and HCl. The effects of salt chemistry, particle size, and feed rate will also be discussed. 
in-line degassing; salt fluxing; aluminum processing