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A Hybrid Experimental and Theoretical Approach to Optimize Recovery of Rare Earth Elements from Acid Mine Drainage Precipitates by Oxalic Acid Precipitation
Wang, Yan1; Ziemkiewicz, Paul2; Noble, Aaron3
2022-02-01
Source PublicationMINERALS
Volume12Issue:2Pages:15
AbstractThe development of processing techniques for the extraction of rare earth elements and critical minerals (REE/CM) from acid mine drainage precipitates (AMDp) has attracted increased interest in recent years. Processes under development often utilize a standard hydrometallurgical approach that includes leaching and solvent extraction followed by oxalic acid precipitation and calcination to produce a final rare earth oxide product. Impurities such as Ca, Al, Mn, Fe and Mg can be detrimental in the oxalate precipitation step and a survey of the literature showed limited data pertaining to the REE precipitation efficiency in solutions with high impurity concentrations. As such, a systematic laboratory-scale precipitation study was performed on a strip solution generated by the acid leaching and solvent extraction of an AMDp feedstock to identify the optimal processing conditions that maximize REE precipitation efficiency and product purity while minimizing the oxalic acid dosage. Given the unique chemical characteristics of AMDp, the feed solution utilized in this study contained a moderate concentration of REEs (440 mg/L) as well a significant concentration (>7000 mg/L total) of non-REE contaminants such as Ca, Al, Mn, Fe and Mg. Initially, a theoretical basis for the required oxalic acid dose, optimal pH and predicted precipitation efficiency was established by solution equilibrium calculations. Following the solution chemistry calculations, bench-scale precipitation experiments were conducted and these test results indicate that a pH of 1.5 to 2, a reaction time of more than 2 h and an oxalic acid dosage of 30 to 40 g/L optimized the REEs recovery of at ~95% to nearly 100% for individual REE species. The test results validated the optimal pH predicted by the solution chemistry calculations (1.5 to 5); however, the predicted dosage needed for complete REE recovery (10 g/L) was significantly lower than the experimentally-determined dosage of 30 to 40 g/L. The reason for this discrepancy was determined to be due to the large concentration of impurities and large number of potential metal complexes that cause inaccuracies in the solution equilibrium calculations. Based on these findings, a hybrid experimental and theoretical approach is proposed for future oxalic acid precipitation optimization studies.
Keywordacid mine drainage precipitates stripping solution rare earth elements contaminants oxalic acid precipitation
DOI10.3390/min12020236
Language英语
WOS KeywordCOAL ; ALUMINUM ; SLUDGE ; ND
WOS Research AreaGeochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS SubjectGeochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS IDWOS:000762462700001
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/52164
Collection中国科学院过程工程研究所
Corresponding AuthorNoble, Aaron
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China
2.West Virginia Univ, Water Res Inst, Morgantown, WV 26506 USA
3.Virginia Tech, Dept Min & Minerals Engn, Blacksburg, VA 24061 USA
Recommended Citation
GB/T 7714
Wang, Yan,Ziemkiewicz, Paul,Noble, Aaron. A Hybrid Experimental and Theoretical Approach to Optimize Recovery of Rare Earth Elements from Acid Mine Drainage Precipitates by Oxalic Acid Precipitation[J]. MINERALS,2022,12(2):15.
APA Wang, Yan,Ziemkiewicz, Paul,&Noble, Aaron.(2022).A Hybrid Experimental and Theoretical Approach to Optimize Recovery of Rare Earth Elements from Acid Mine Drainage Precipitates by Oxalic Acid Precipitation.MINERALS,12(2),15.
MLA Wang, Yan,et al."A Hybrid Experimental and Theoretical Approach to Optimize Recovery of Rare Earth Elements from Acid Mine Drainage Precipitates by Oxalic Acid Precipitation".MINERALS 12.2(2022):15.
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