Process optimization of neodymium chloride solutions precipitated by magnesium bicarbonate
来源期刊：JOURNAL OF RARE EARTHS2019年第4期
论文作者：Yannan Yan Yang Xu Xiaowei Huang Zongyu Feng Yongke Hou Kai Li Liangshi Wang
文章页码：437 - 442
摘 要：Rare earths（REs） are of vital importance for the development of new materials and green energy.Magnesium bicarbonate is one of the most recyclable and environmental-friendly precipitant for REs recovery from leaching solutions. Nd2（CO3）3 has difficulties in industrial production. So in this study,the precipitation of neodymium from chloride solution by magnesium bicarbonate are investigated. The effects of feeding method, [HCO3-]/[Nd3+] mole ratio, feeding speed and reaction temperature on yield and impurity（magnesia） content are systematically studied. Results show that the impurity（magnesia）content decreases to 0.010 wt% with a yield approaching to 100% obtained under the conditions of[HCO3-]/[Nd3+] = 3.00 by parallel flow addition at 50 ℃. The major impurity（magnesia） in rare earth carbonates mainly presents in the form of physical absorption, which can be easily removed by scrubbing. Therefore, it offers a promising green process that uses magnesium bicarbonate to produce neodymium carbonate due to its cycling of carbon dioxide, magnesium salt and waste water.
Yannan Yan1，Yang Xu1,2，Xiaowei Huang1,2，Zongyu Feng1,2，Yongke Hou1,2，Kai Li1,2，Liangshi Wang1,2
1. National Engineering Research Center for Rare Earth Materials, GRINM Group Co., Ltd.2. Grirem Advanced Materials Co., Ltd., GRINM Group Co., Ltd.
摘 要：Rare earths（REs） are of vital importance for the development of new materials and green energy.Magnesium bicarbonate is one of the most recyclable and environmental-friendly precipitant for REs recovery from leaching solutions. Nd2（CO3）3 has difficulties in industrial production. So in this study,the precipitation of neodymium from chloride solution by magnesium bicarbonate are investigated. The effects of feeding method, [HCO3-]/[Nd3+] mole ratio, feeding speed and reaction temperature on yield and impurity（magnesia） content are systematically studied. Results show that the impurity（magnesia）content decreases to 0.010 wt% with a yield approaching to 100% obtained under the conditions of[HCO3-]/[Nd3+] = 3.00 by parallel flow addition at 50 ℃. The major impurity（magnesia） in rare earth carbonates mainly presents in the form of physical absorption, which can be easily removed by scrubbing. Therefore, it offers a promising green process that uses magnesium bicarbonate to produce neodymium carbonate due to its cycling of carbon dioxide, magnesium salt and waste water.
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