Reducing iron content in molten aluminum by super-gravity segregation
Effects of super-gravity on the removal of iron from molten aluminum were investigated under condition of centrifugal furnace heating with a super-gravity coefficient of 400. Hypereutectic, eutectic and hypoeutectic Al-Fe alloys were used in the experiments with initial iron mass fraction of 2.88 ％, 1.73 ％ and 0.99 ％ respectively. The alloy sample with covering protective slag was heated for 30 min at 800 ℃, then the keeping the molten sample rotating at specified angular velocity until the sample was cooled to room temperature with a rate of 10 ℃/min. The sample was cut into halves along the direction of super-gravity. One-half of the samples used for chemical analysis by ICP-OES at different locations, four 2mm-wide slices that evenly distributed along the direction of super-gravity were chipped out for chemical analysis. The other half was prepared for optical microscope. The following conclusions were obtained from the experimental results for the samples under the super-gravity field. (1) The primary Al3Fe particles were propelled to the bottom of crucible, the iron concentration of the hypereutectic，eutectic and hypoeutectic alloy increased along the direction of super-gravity. (2) The concentration ratios between the bottom and surface part reached 7.44, 2.53 and 3.21 respectively. (3) The iron content of eutectic was the limitation of hypoeutectic Al-Fe alloy super-gravity segregation under high cooling rate. (3) Super-gravity segregation can make the aluminum alloy with a higher purity by directional gathering primary α-Al.
Super-gravity Al-Fe alloy Al3Fe segregation
Shitong SUN Jingwei LI Zhancheng GUO Huiqing TANG Zhi WANG
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 1 National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of P
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-8
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）