Process development for the recovery of high-grade lanthanum by solvent extraction

被引：106

作者：

Morais, CA

Ciminelli, VST

机构：

[1] Univ Fed Minas Gerais, Dept Met & Mat Engn, BR-30160303 Belo Horizonte, MG, Brazil

[2] CNEN, CDTN, BR-30123970 Belo Horizonte, MG, Brazil

来源：

HYDROMETALLURGY | 2004年 / 73卷 / 3-4期

关键词：

lanthanum; lanthanum recovery; lanthanum extraction;

D O I：

10.1016/j.hydromet.2003.10.008

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The development of a solvent extraction process for the recovery of high-grade lanthanum oxide from a light rare earth (RE) (La, Pr, Nd) chloride solution is described. In a preliminary stage, process parameters and experimental conditions were explored in bench-scale experiments. The effect of variables such as nature and concentration of the extractants (di-2-ethylhexylphosphoric acid [DEHPA] and 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester [HEH(EHP)]), contact time, acidity and rare earth concentration in the extraction stage as well as the effect of the hydrochloric acid concentration in the stripping stage were investigated. The continuous counter-current experiments were carried out in a mini-battery unit of mixer-settlers. The final set-up was comprised of 22 stages: 8 for extraction, 8 for scrubbing and 6 for stripping. A high-grade oxide (>99.9% La2O3) was obtained with a yield superior to 99.9%. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：237 / 244

页数：8

共 35 条

[1] SOLVENT-EXTRACTION OF LANTHANUM(III) AND CERIUM(III) FROM AQUEOUS CHLORIDE SOLUTIONS BY LIX-70 [J].