高稀土含量多组元熔渣结晶析出规律研究
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摘要
利用X射线衍射分析仪(XRD)、附带能谱仪的扫描电镜(SEM-EDS)分析了65%(质量分数,下同)La_2O_3-16%SiO2-8%Al_2O_3-4%B2O3-7%FeO和50%La_2O_3-25%SiO2-25%FeO两种高稀土含量多组元渣系的结晶析出规律。分析结果表明,两种渣在不同淬火温度下均析出单一物相,分别为六方晶系的La9. 31(Si1. 04O4)6O2和单斜晶系的La2Si2O7相,两种析出相的尺寸和析出数量在各渣系中随着淬火温度的降低而增加。此外,前渣不同淬火温度下玻璃相中的La含量高达～60%,而后渣玻璃相中La含量为18. 84%～42. 49%。
The crystallization behaviour of two kinds of high rare earth content multicomponent slags( 65 La_2O_3-16 SiO2-8 Al_2O_3-4 B2 O3-7 Fe O slag and 50 La_2O_3-25 SiO2-25 FeO slag) has been studied by X-ray diffraction( XRD) and scanning electron microscopy( SEM) with energy dispersive spectroscopy( EDS). The results show that both slags precipitate a single phase at different quenching temperatures,which are hexagonal La9. 31( Si1. 04 O4)6 O2 and monoclinic La2 Si2 O7 phases,respectively.Meanwhile,the size and quantity of the two precipitated phases increases with the decrease of the quenching temperature in each slag system. In addition,the La content of the glass phase in the slag of 65 La_2O_3-16 SiO2-8 Al_2O_3-4 B2 O3-7 Fe O at different quenching temperatures is as high as ～ 60%,and the La content in the glass phase of the slag of 50 La_2O_3-25 SiO2-25 FeO is 18. 84% to 42. 49%.
The crystallization behaviour of two kinds of high rare earth content multicomponent slags( 65 La_2O_3-16 SiO2-8 Al_2O_3-4 B2 O3-7 Fe O slag and 50 La_2O_3-25 SiO2-25 FeO slag) has been studied by X-ray diffraction( XRD) and scanning electron microscopy( SEM) with energy dispersive spectroscopy( EDS). The results show that both slags precipitate a single phase at different quenching temperatures,which are hexagonal La9. 31( Si1. 04 O4)6 O2 and monoclinic La2 Si2 O7 phases,respectively.Meanwhile,the size and quantity of the two precipitated phases increases with the decrease of the quenching temperature in each slag system. In addition,the La content of the glass phase in the slag of 65 La_2O_3-16 SiO2-8 Al_2O_3-4 B2 O3-7 Fe O at different quenching temperatures is as high as ～ 60%,and the La content in the glass phase of the slag of 50 La_2O_3-25 SiO2-25 FeO is 18. 84% to 42. 49%.
引文
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[10]姜银举,徐掌印,李佩璋,等.AB5型稀土系储氢合金冶炼废渣回收利用方法[P].中国:ZL201010114005. 9,2011-12-14.Jiang Y J,Xue Z Y,Li P Z,et al. Method for recycling smelting slag of AB5-type rare earth-based hydrogen storage alloy[P]. China:ZL201010114005. 9,2011-12-14.
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