Metal quality comparison of alcan compact degasser and snif at alcoa mount holly casthouse

摘要

LiMCA and Alscan measurements of inclusion and hydrogen concentrations were performed at the Alcoa Mount Holly Casthouse to compare the metal quality obtained with an Alcan Compact Degasser to that obtained with a SNIF degasser. The measurements were conducted at two casting pits that are identical except for the degassers. The in-line metal treatment at one pit has a two stage. R-140 SNIF degassing unit, while the other pit uses a six rotor Alcan Compact Degasser. Identical ceramic foam filters are used downstream of the degassers.