Recovery of Rare Earth Elements from Acid Mine Drainage Using Staged Chemical Precipitation

被引：0
|
作者：
Xie Y. [1 ]
Wu P. [2 ,3 ]
Li X. [1 ,3 ]
Huang J. [2 ]
Chen X. [1 ]
机构：
[1] College of Agriculture, Gui⁃ zhou University, Guiyang
[2] College of Resources and Environmental Engineering, Guizhou University, Guiyang
[3] Key Laboratory of Karst Geological Resources and Environment, Ministry of Education, Guiyang
来源：
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | / 42卷 / 02期
关键词：
acid mine drainage; chemical precipitation; rare earth elements; rare earth recovery;
D O I：
10.11785/S1000-4343.20240219
中图分类号：
学科分类号：
摘要：
Acid mine drainage（AMD）is of great interest because of its high concentration of dissolved rare earth elements and yttrium（REY），and the recovery of REY from AMD is a potential source of rare earth re⁃ plenishment. To investigate the feasibility of recovering REY from AMD，AMD with REY content of 29.8×10-6 was collected from an abandoned coal mine shaft in Guizhou as raw material in this study，and a graded chemi⁃ cal precipitation-acid dissolution-oxalic acid selective precipitation method was used to recover REY from AMD. experimental results show that using NaOH as pH adjuster after removing 99.8% of Fe3+ and 67.1% of Al3+ and other major contaminating ions from AMD，a highly enriched precipitate（about 1.0% content）of REY was ob⁃ tained. The precipitate was dissolved by HNO3 to obtain a REY-rich preconcent rate，and 95% of the REY in the concentrate was recovered by adding oxalic acid solution at an optimal pH of 2. The final product was cal⁃ cined and oxidized to obtain rare earth oxides with a purity of 97%. © 2024 Editorial Office of Chinese Rare Earths. All rights reserved.
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页码：360 / 370
页数：10
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