Thermal Decomposition Kinetics of Rare Earth Minerals in Tailings with Addition of MgO

Metals

Xiangxin Xue¹  Jianxing Liu¹  He Yang¹  Shizhe Song¹  Yan Zhou¹  Gongjin Cheng¹ 

[1] School of Metallurgy, Northeastern University, Shenyang 110169, China;

关键词: kinetics;    rare earth;    MgO roasting;    Bayan Obo tailings;    thermal decomposition;    magnetizing roasting;   

DOI  :  10.3390/met11050701

来源: DOAJ

【 摘 要 】

Due to the advantage in deactivating fluorine and enhancing the decomposition of rare earth (RE) minerals, MgO was applied to the magnetizing roasting of Bayan Obo tailings in this work. The effects of MgO dosages, roasting temperature, and holding time on the decomposition rate of RE minerals were experimentally studied. With a MgO dosage of 10 wt.%, the decomposition rate of RE minerals reached 98.09% at 750 °C. The phase composition of roasted samples was characterized by XRD and SEM-EDS. The incomplete decomposition rate was investigated with the observation of leaching residual by SEM-EDS. The decomposition kinetics of the RE minerals with the addition of MgO was analyzed with the Ginstling-Brundshtein model, where the reaction rate was controlled by chemical reaction.

【 授权许可】

Unknown