QUANTIFYING FACTORS AFFECTING ALUMINUM IN-LINE DEGASSING EFFICIENCY

摘要

Extensive plant data taken from two significantly different aluminum alloys produced in three different SNIF degassing units was analyzed to help quantify the effects of atmospheric humidity and other operating parameters on dissolved hydrogen removal. Absolute humidity increased by an average of 54% during the summer months in one location while aluminum post-treatment hydrogen level increased on average by 20%. Techniques are discussed which can be employed to increase hydrogen removal efficiency and mitigate the effects of high humidity. Data collected during formal degasser acceptance testing is also presented where sodium and inclusion removal and dross formation is evaluated.