Extraction of yttrium and europium from waste cathode-ray tube (CRT) phosphor by subcritical water

Lin, Ella Y.; Rahmawati, Astrid; Ko, Jo-Hsin; Liu, Jhy‐Chern

doi:10.1016/j.seppur.2017.10.004

Cited by 37 publications

(26 citation statements)

References 35 publications

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“…The standard diffraction patterns of Y 2 O 2 S and Eu 2 O 2 S are quite similar since there are some peaks of Y 2 O 2 S and Eu 2 O 2 S which are very close and overlapped each other in the XRD pattern of waste CRT phosphor, such as peaks around 30° and 27°. The metals composition of waste CRT phosphor used in this study was analyzed in previous work, and it was reported that the dominant metals contained in waste CRT phosphor were Zn, Pb, sulfur (S), and Y, while silica (SiO 2 ) was the fraction that could not be dissolved by aqua‐regia digestion. The content of Zn, Y, Pb, and Eu in the waste CRT phosphor were 80.85 mg g −1 , 44.56 mg g −1 , 50.95 mg g −1 , and 3.07 mg g −1 , respectively .…”

Section: Resultsmentioning

confidence: 99%

“…The metals composition of waste CRT phosphor used in this study was analyzed in previous work, and it was reported that the dominant metals contained in waste CRT phosphor were Zn, Pb, sulfur (S), and Y, while silica (SiO 2 ) was the fraction that could not be dissolved by aqua‐regia digestion. The content of Zn, Y, Pb, and Eu in the waste CRT phosphor were 80.85 mg g −1 , 44.56 mg g −1 , 50.95 mg g −1 , and 3.07 mg g −1 , respectively . The data were used as the content of each element in the original waste CRT phosphor to determine the leaching efficiency of an element using Eqn 1.…”

Section: Resultsmentioning

confidence: 99%

“…The elemental composition and empirical formula of elements in waste CRT phosphor and the leaching residue were analyzed using the X‐ray photoelectron spectroscopy (XPS, VG Scientific ESCALAB 250, Thermo Fisher Scientific, Waltham, MA, USA) with a monochromatic X‐ray gun at 15 kV and 200 W, beam size 650–120 um. The metals content in the solution was analyzed using aqua‐regia digestion method as described in our earlier work …”

Section: Methodsmentioning

confidence: 99%

“…Hydrometallurgical method has some advantages over pyrometallurgical one, such as lower energy consumption, lower toxic gas emission, and more effective leaching of metals . The conventional hydrometallurgical process for REEs recovery uses various types of mineral acids as leaching agents, such as hydrochloric acid (HCl), sulfuric acid (H 2 SO 4 ), and nitric acid (HNO 3 ) . Review literatures of acid extraction of Y and Eu revealed that high temperature, long reaction time, and concentrated acid are needed in leaching …”

Section: Introductionmentioning

confidence: 99%

“…5 The conventional hydrometallurgical process for REEs recovery uses various types of mineral acids as leaching agents, such as hydrochloric acid (HCl), sulfuric acid (H 2 SO 4 ), and nitric acid (HNO 3 ). 6,17,18 Review literatures of acid extraction of Y and Eu revealed that high temperature, long reaction time, and concentrated acid are needed in leaching. [19][20][21] 3860 www.soci.org J Lie, S Ismadji, J-C Liu…”

Section: Introductionmentioning

confidence: 99%

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Microwave‐assisted leaching of rare earth elements (Y and Eu) from waste cathode ray tube phosphor

Lie

Ismadji

Liu

2019

J of Chemical Tech & Biotech

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BACKGROUND Phosphor in discarded cathode ray tube (CRT) contained valuable metals, yttrium (Y) and europium (Eu), which are categorized as technology‐critical elements (TCEs) in terms of their supply risk and importance in emerging technologies. Microwave‐assisted leaching was applied to recover Y and Eu from waste CRT with sulfuric acid (H2SO4) solution as the leaching agent in the current study. It is aimed to develop an alternative leaching method of valuable metals from waste CRT phosphor. RESULTS The effects of microwave power and acid concentration on leaching efficiency of Y and Eu were investigated. Shrinking‐core model could describe the leaching kinetics of Y and Eu well and it was controlled by chemical reaction and diffusion through the product layer. Higher leaching efficiency was found when microwave power increased from 200 to 600 W, and was also found as acid concentration increased from 0.5 to 2 mol L−1. Leaching efficiency of Y and Eu were 78.07% and 100%, respectively, for Y and Eu within 60 min at microwave power of 400 W, using 2 mol L−1 of H2SO4 at 10 g L−1 of solid to liquid ratio. Compared with conventional leaching, microwave‐assisted leaching is an alternative technology that could shorten reaction time significantly. CONCLUSIONS The concentration of acid and microwave power affected microwave‐assisted leaching of Y and Eu from waste CRT phosphor. Microwave‐assisted leaching could be an alternative process for rare earth elements recovery. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%