碳酸氢钠沉淀法制备大粒度高纯度氧化镨钕研究

Preparation of Large-Sized High-Purity Praseodymium and Neodymium Oxide by Precipitation with Sodium Bicarbonate

以碳酸氢钠为沉淀剂,采用正序分段加料的方式制备氧化镨钕,研究了沉淀终点pH值、沉淀温度对氧化镨钕前驱体及产品氧化镨钕粒度、杂质含量的影响。结果表明,当沉淀终点pH值为5.10、沉淀温度50℃时,制备的氧化镨钕粉体中位粒度D_(50)为21.45μm,粒度分布窄,形貌为片状结晶团聚形成的类球形粉体,其中Cl^(-)含量为0.017%,Na_(2)O含量为0.012%,关键指标优于国家标准的要求。

With sodium bicarbonate as a precipitant, praseodymium neodymium oxide was prepared by feeding step by step in a positive sequence. The effects of pH value at the end of precipitation and precipitation temperature on particle size and impurity content of the precursor and product of praseodymium neodymium oxide were all investigated. The results show that precipitation at 50℃ with pH value of 5.10 at the end can prepare a praseodymium neodymium oxide powder with a median particle size D_(50) of 21.45 μm and narrow particle size distribution. It is sphere-like powder formed by flake crystallization agglomeration, with the content of Cl^(-)and Na_(2)O at 0.017% and 0.012%, respectively, indicating higher than the national standards.