Extraction of rare earth elements from low-grade Bauxite via precipitation reaction

3rd International Conference on Chemical Engineering Sciences and Applications 2017

Kusrini, E.^1 ; Nurani, Y.^1 ; Bahari, Z.J.^1

Department of Chemical Engineering, Faculty of Engineering, Universitas Indonesia, Kampus Baru UI, Depok

16424, Indonesia^1

关键词: Acid leaching;    After-treatment;    Low-grade bauxite;    Metal composition;    Precipitation methods;    Precipitation reaction;    Sodium phosphate;    Total recovery;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/334/1/012052/pdf
DOI  :  10.1088/1757-899X/334/1/012052

来源: IOP

【 摘 要 】

The aim of this research was to determine the optimum hydrometallurgical parameters to extract the rare earth elements (REE) from low-grade bauxite through acid leaching and precipitation reaction. REE or lanthanide recovery by a precipitation method with sodium sulphate and sodium phosphate as precipitation agents is reported where the effect of pH and recovery of REE are described. The metal composition of REE in low-grade bauxite after treatment were analyzed by ICP-OES. The total recovery values of REE elements at the first precipitation reaction using sodium sulphate as the precipitation agent at pH 3.5 showed ∼68.2% of lanthanum, ∼18.9% cerium, and ∼7.8% yttrium. Lanthanum was the rare-earth element present at the highest concentration in the low-grade bauxite after the series treatments. An optimum pH of 3.5 for precipitation of rare-earth elements using sodium sulphate was demonstrated where this method is recommended for the extraction of REE elements from low-grade bauxite.