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Liquid-liquid extraction of yttrium from the sulfate leach liquor of waste fluorescent lamp powder: Process parameters and analysis

Title
Liquid-liquid extraction of yttrium from the sulfate leach liquor of waste fluorescent lamp powder: Process parameters and analysis
Authors
Saratale, Ganesh DattatrayaKim, Hee-YoungSaratale, Rijuta GaneshKim, Dong-Su
Ewha Authors
김동수
SCOPUS Author ID
김동수scopus
Issue Date
2020
Journal Title
MINERALS ENGINEERING
ISSN
0892-6875JCR Link
Citation
MINERALS ENGINEERING vol. 152
Keywords
Liquid-liquid extractionFluorescent waste lamp powderYttriumRare earth metalsHydrometallurgical process
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Global demand for rare earth metals (REMs), including yttrium, has motivated the scientific community to focus on the recovery of such metals from electronic waste materials. Herein, a solvent extraction method was used to isolate and recover yttrium from the original leaching solution from the fluorescent lamp waste powder dissolved by sulfate. The operating parameters were systematically investigated, including pH, equilibrium time, concentration of extractants, and organic/aqueous ratio using Versatic Acid 10, TOPO, D2EHPA, and Alamine 336. The extracting capacities were in the order of D2EHPA > Versatic Acid 10 > TOPO > Alamine 336. The reaction mechanism of yttrium with each extractant demonstrated the formation of complex compounds with concentration ratios of 1:3, 1:1, and 1:2 with Versatic Acid 10, D2EHPA, and TOPO, respectively. On investigating the extraction mode for yttrium and impurities in the range of equilibrium pH (pH(eq)) values from 0.95 to 2.25 using D2EHPA, pH(e) 2.02 (initial pH 2.53) was found to be the most suitable for extraction. Fe in the original leaching solution could be utterly eradicated through the acidity control method. Upon calculating the theoretical number of mixer-settler plates, more than 99% of yttrium was extracted in solution with only two plates as the organic phase. Finally, the stripping WA showed favorable stripping rates and followed the order HCl (78.12%) > H2SO4 (76.36%) > HNO3 (74.86%) within 10 min. This study is a first step toward developing large-scale operations for extracting REMs from fluorescent lamp waste powder.
DOI
10.1016/j.mineng.2020.106341
Appears in Collections:
엘텍공과대학 > 환경공학전공 > Journal papers
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