Separation efficiency of alumina particles in Al melt under high frequency magnetic field

• Published in: Transactions of Nonferrous Metals Society of China 2010, Vol.20 (1), p.153-157
• Main Author: 郭庆涛 曹志强 张忠涛 李廷举 金俊泽 HONG Chun-pyo
• Format: Article
• Language: English
• Subjects: Al melt; alumina particles; Aluminum; Aluminum oxide; Computational efficiency; Computing time; electromagnetic separation; high frequency magnetic field; Magnetic induction; Mathematical analysis; Melts; Separation; separation efficiency; 分离效率; 分离时间; 氧化铝颗粒; 磁感应强度; 粒子数; 计算结果; 铝熔体; 高频磁场
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(09)60113-8

The effects of separation time and magnetic induction intensity on the separation efficiency of alumina particles with diameters varying from 30 to 200 μm in aluminum melt were investigated. The experimental results show that the particleaccumulated layer is formed in the periphery of the solidified specimen when the diameter of the separated molten metal, the magnetic induction intensity and the separation time are 10 ram, 0.04 T and 1 s, respectively. When the separation time is 2 s, the particle-accumulated layer can be observed obviously and the separation efficiency is about 80%. There are few alumina particles in the inner of the solidified specimen when the separation time is 3 s. The separation efficiency higher than 85% can be achieved when the separation time is longer than 3 s. When the magnetic induction intensity is 0.06 T, the visible particle-accumulated layer can be formed in 1 s and the separation efficiency is higher than 95%. The experimental results were compared with the calculated results atlast.