Process development for the extraction of rare earth elements from an acid mine drainage treatment sludge

被引：10

作者：

Cicek, Zeynep ^{[1
]}

Mira, Alejandro Agudelo ^{[1
]}

Huang, Qingqing ^{[1
]}

机构：

[1] West Virginia Univ, Dept Min Engn, 365 Mineral Resources Bldg,1374 Evansdale Dr, Morgantown, WV 26506 USA

来源：

RESOURCES CONSERVATION AND RECYCLING | 2023年 / 198卷

关键词：

Acid mine drainage; Treatment sludge; Rare earth elements; Separation and processing; Rare earth oxide; SOLVENT-EXTRACTION; FIRE-CLAY; COAL BED; RECOVERY; YTTRIUM; PENNSYLVANIA; RESOURCES; IRON(III); SCANDIUM; METALS;

D O I：

10.1016/j.resconrec.2023.107147

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The study focused on developing a separation approach to recover REEs from AMD treatment sludge. Parametric leaching tests were first conducted, and optimum leaching conditions were determined as a pH value of 0.5 and a leaching time of 8 min. Stage-wise precipitation tests were then applied to illustrate the precipitation behaviors of various groups of elements at different pH regions. Test results indicate that selectively recovering individual REEs by targeting one particular pH region was not feasible. However, impurities, specifically iron and silicon, could be selectively removed from REEs at pH 3.5. Afterward, three different solvent extraction methodologies, including regular solvent extraction with DEHPA, solvent extraction with a phase modifier of TBP, and postoxidation solvent extraction, were evaluated for enhanced rare earth oxide purity. As a result of the developed process, a mixed rare earth product with a purity of 80% by weight was produced from the AMD treatment sludge.

引用

页数：13