Movement behavior and separation of Al_(2)O_(3)from Al melt under rotating magnetic field  

作　　者：Shan-hao Du Yu-ting Shen Yu-bo Zhang Shao-jun Yu De-hua Liu Ting-ju Li 

机构地区：[1]Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China [2]Ningbo Institute of Dalian University of Technology,Ningbo 315016,Zhejiang,China [3]School of Mechanics,Dalian University of Technology,Dalian 116024,Liaoning,China

出　　处：《China Foundry》2024年第6期625-633,共9页中国铸造（英文版）

基　　金：support of the National Natural Science Foundation of China(Nos.52171135 and 51971048).

摘　　要：The effect of a rotating magnetic field(RMF)on the distribution of Al_(2)O_(3)particles with an Al melt was studied by means of simulation and experiment.The results show that Al_(2)O_(3)particles(diameter of 1-10μm,1wt.%)are significantly agglomerated at the top of ingots when subjected to an RMF,and their distribution is influenced by both the intensity and the duration of RMF application.The optimal separation efficiency is achieved with the magnetic intensity of 12 mT for 120 s.The number of the particles at the bottom and the middle decreases by 64.5%and 69.7%,respectively,while that at the top increases by 242.5%compared to the condition without an RMF.However,if further increase the intensity or the duration of RMF,it can induce turbulent flows that draw some of the separated Al_(2)O_(3)particles back into the melt,reducing separation efficiency.The calculation results show that as the magnetic intensity increases from 6 mT to 18 mT,the velocity difference between the particles and the Al melt flow quadruples,increasing from 0.013 m·s^(-1)to 0.066 m·s^(-1).Driven by this velocity difference,centrifugal motion,and secondary circulation,Al_(2)O_(3)particles tend to migrate upwards within the melt,facilitating the separation of impurity particles and enhancing the purity of the melt.

关 键 词：Al_(2)O_(3)particles rotating magnetic field numerical simulation electromagnetic purification 

分 类 号：TG146.21[一般工业技术—材料科学与工程]