以Er2O3为铒源制备铝铒中间合金的反电动势研究

Study on Reverse EMF of Aluminum Erbium Intermediate Alloy Prepared with Er2O3 as Erbium Source

以Er 2O 3为铒源,在750℃,熔盐KF(25%)-LiF(20%)-ErF 3(10%)-KCl(45%)体系中,下沉铝为阴极,研究铝铒中间合金的反电动势。结果表明:在16 A/dm 2的条件下,反电动势随着时间增加出现先增大后稳定不变,加入2%Er 2O 3,反电动势平均下降0.19 V,测得加料周期为6 min。随着电流密度增加,电流效率、铝铒中间合金中铒的浓度均呈现先增大后减小趋势。在电解时间为24 min、12 A/dm 2时电流效率达到最大值74.64%,合金中铒的浓度达到最大值3.65%。合金成分主要为Al 3Er,少部分为Al 12 Er,且分布较为均匀。

Reverse EMF of aluminum erbium intermediate alloy was investigated at 750℃,molten KF(25%)-LiF(20%)-ErF 3(10%)-KCl(45%)system with Er 2O 3 as source of erbium.The results show that reverse EMF rises first and then stabilizes with increase of time under condition of 16 A/dm 2.After adding Er 2O 3(2%),anti-EMF drops 0.19 V on average,and the feeding period is 6 min.Current efficiency and erbium yield rise firstly and then drop with increase of current density.When electrolysis time is 24 min and current density is 12 A/dm 2,erbium concentration in alloy reaches the maximum value of 3.65%,and current efficiency reaches the maximum value of 74.64%.Alloy is mainly composed of Al 3Er and few of Al 12 Er,and the distribution is more uniform.