摘要
根据热力学数据,绘制了25℃条件下NdCl_(3)-AlCl_(3)-NH_(4)HCO_(3)体系在总碳浓度为1.0 mol/L条件下各组分的lg cB-pH曲线,以及在不同总碳浓度条件下Al与Nd的lg cB-pH曲线;分析了用碳酸氢铵沉淀稀土时各组分的行为。结果表明:pH在2.8~7.0范围内,可实现Nd_(2)(CO_(3))_(3)沉淀;pH在2.8~3.7范围内,铝不易与稀土共沉淀,但pH范围窄,控制难度较大;pH在3.7~7.0范围内,Al易以Al(OH)3形式与碳酸稀土共沉淀导致稀土产品中铝超标,所以在用碳酸氢铵沉淀稀土之前应去除铝。
Base on thermodynamic data,the lg cB-pH relation curve of component in NdCl_(3)-AlCl_(3)-NH_(4)HCO_(3) system at total carbon concentration of 1.0 mol/L and 25℃was drawn,and the lg cB-pH relation curve of Al and Nd in solutions are drawn at different total carbon concentrations.The behavior of each component in the precipitation of rare earth using ammonium bicarbonate is given.The results show that Nd_(2)(CO_(3))_(3) precipitation can be achieved at pH of 2.8~7.0,aluminum co-precipitates with rare earth carbonate at pH of 3.7~7.0 as Al(OH)3.Therefore,it is necessary to remove aluminum before precipitating rare earth carbonate using ammonium bicarbonate.
作者
王强
林春雷
徐略渭
何秉轩
梁勇
WANG Qiang;LIN Chunlei;XU Luewei;HE Bingxuan;LIANG Yong(Ganzhou Rare Earth Longnan Smelting Separation Co.,Ltd.,Ganzhou 341000,China;Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China)
出处
《湿法冶金》
CAS
北大核心
2021年第5期399-402,共4页
Hydrometallurgy of China
基金
江西省离子型稀土资源绿色开发与高值利用国家重点实验室培育计划项目(20194AFD44003)
广东省放射性与三稀资源利用重点实验室开放基金资助项目(2018B030322009)
江西理工大学清江青年英才支持计划项目(JXUSTQJBJ2017004)
江西理工大学大学生创新创业训练计划项目(DC2019-036)。
关键词
稀土
热力学
碳酸氢铵
沉淀
rare earth
thermodynamics
ammonium bicarbonate
precipitation
