Effect of Chemical Composition on the Crystallization Behaviour of Rare Earth Phase in Slag
In order to figure out the effect of chemical composition on the crystallization behaviour of rare earth phase in rare earth slag, the quaternary system SiO2–CaO–CaF2–Ce2O3 slags were made by pure chemical reagent at 1673 K in muffle furnace. The mineral phases and micromorphology of slags were detected by the X-ray diffraction and scanning electron microscope (SEM), respectively. The results show that grains of RE-containing mineral grow very well and the equivalent diameter of grains is about 100 μm when the basicity is about 1. The effect of CaF2 on the crystallization of the rare earth phase is complex. With the increase of basicity, the crystallization of the rare earth phase is increasing and the RE-concentrating phase exists in a rod-like structure. But when the alkalinity is up to 2.0, the distribution of RE-concentrating phase becomes dispersive and the crystals of rare earth phase have no definite shape. The major minerals are fluorite, cuspidine, RE-concentrating phase and substrate phase.
KeywordsRare earth slag SiO2–CaO–CaF2–Ce2O3 Crystallization behaviour
The authors gratefully acknowledge the support of National Natural Science Foundation of China (No. 51874029) and the project of State Key Laboratory of Advanced Metallurgy (No. 41618018).
- 1.Cheng JZ, Che LP (2010) Current mining situation and potential development of rare earth in China. Chin Rare Earths 31(2):65–69Google Scholar
- 2.Yang X, Zheng Y, Yang X et al (2000) A Geochemical study of an REE-rich carbonatite dyke at Bayan Obo, Inner Mongolia, Northern China. Acta Geol Sin 74(3):605–612Google Scholar
- 4.Ye-Sheng LI, Dong DQ, Zi-Ping WU (2006) Research status and application prospects of rare earth in magnesium alloys. Light Alloy Fabrication Technol 34(4):1–6Google Scholar
- 5.Li Wu, Hong Zhenhong (1996) Present Status and Future Prospect of Rare Earth Application in China. Chin Rare Earths 17(6):48–53Google Scholar
- 6.Zhongshan Wang, Qinggang Zhu et al (1999) Applications and prospects of rare-earth elements in national ecomomy. Sci Tech Inf Dev Econ 5:28–30Google Scholar
- 7.yongfu Yu (2001) Dress technology of REO ore and its development in china. J china univ min Technol 30(6):537–542Google Scholar
- 8.Zeqi Y, Qiang Z, Xiapeng Z (1992) Separation of cerite calcium and rare earth bearing barium fluorophlogopite. Nonferrous Met 44(1):46–53Google Scholar
- 12.Xu XY, Li MY, Hao MZ et al (1980) Crystallization and washability for blast furnace slags of Baotou rich rare earth iron mine. Chin Rare Earths 18(3):1–7Google Scholar