Purification of scrap aluminum foil and aluminum melt covering and protecting & atomic purification theory
(1. Department of Mechanical Engineering,
Nantong Institute of Technology, Nantong 226007, China;
2. College of Materials Science and Engineering,
Shanghai Jiaotong University, Shanghai 200030, China)
Nantong Institute of Technology, Nantong 226007, China;
2. College of Materials Science and Engineering,
Shanghai Jiaotong University, Shanghai 200030, China)
Abstract: A new flux, JDN-I, including rare earth compounds, for purification of the scraps of 99.99% aluminum foil was introduced. The experimental results indicate that its function of degassing and deoxidizing is excellent. The hydrogen content of the scrap aluminum foil melt purified by JDN-I flux decreases greatly from 4.5mL/kg to 1.2mL/kg at 720℃. The tensile strength of the samples refined with JDN-I flux increases by 19.2% and the elongation increases by 38.3% in comparison with those without flux. The purification mechanism of JDN-I was discussed and a theory of covering, protecting & atomic purification was also put forward.
Key words: degassing; deoxidation; scrap aluminum foil; rare earth flux; atomic purification