Decomposition of monazite in Bayan Obo rare earth ore by roasting of Na_(2)CO_(3)pellets  

作　　者：Ruifeng Ma Jianfei Li Xiaowei Zhang Peijie Jia Zhaogang Liu Jinxiu Wu Fushan Feng Wenbin Xin 

机构地区：[1]College of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou,O14010,China [2]Key Laboratory of Green Extraction and Efficient Utilization of Light Rare Earth Resources,Ministry of Education,Baotou,O14010,China [3]Key Laboratory of Rare Earth Wet Metallurgy and Light Rare Earth Applications of Inner Mongolia Autonomous Region,Baotou,O14010,China

出　　处：《Journal of Rare Earths》2024年第10期1969-1978,共10页稀土学报（英文版）

基　　金：Project supported by the Inner Mongolia Autonomous Region Natural Science Foundation(2022QN05017);the National Natural Science Foundation of China(51964040);National Key Research and Development Program of China(2022YFC2905800)。

摘　　要：To resolve the issue of rotary kiln agglomeration during the sodium carbonate roasting of dolomite rare earth ore,this study introduces an oxidation-sodization pellet roasting method for decomposing mixed rare earth concentrates.The focus of this paper lies in understanding the bonding and roasting mechanism of sodium polyacrylate as a binder to dolomite ore and examining the process index of Na_(2)CO_(3)pellets roasting-acid leaching using X-ray diffraction(XRD),scanning ele ctron microscopy with energy dispersive spectroscopy(SEM-EDS),and zeta potential analysis,The results indicate that sodium polyacrylate facilitates the bonding of sodium carbonate to monazite via adsorption of positive and negative charges,and upon roasting at 750℃for 1.5 h to obtain rare earth oxides.Under conditions of a hydrochloric acid(HCl)concentration of 9 mol/L,a reaction for 60 min,a solid-to-liquid ratio(g:mL)of 1:5,and reaction temperature of 90℃,the leaching rates of rare earth elements and thorium(Th)reached maxima of 85.14%and 95.53%,respectively.The process results in a yield of 47.61%for fluorine(F)and89.25%for phosphorus(P).This research forms a foundation for the sodium carbonate roasting decomposition of mixed rare earth concentrates.

关 键 词：Rare earths PELLETS DECOMPOSITION Extraction Bayan Obo 

分 类 号：TF845[冶金工程—有色金属冶金]