Standard

Characterization and feasibility studies on complete recovery of rare earths from glass polishing waste. / Borra, Chenna Rao; Vlugt, Thijs J.H.; Spooren, Jeroen; Nielsen, Peter; Yang, Yongxiang; Offerman, S. Erik.

In: Metals, Vol. 9, No. 3, 278, 2019.

Research output: Contribution to journalArticleScientificpeer-review

Harvard

APA

Vancouver

Author

BibTeX

@article{3130f23a9e0a49a8b8c553c83e5366be,
title = "Characterization and feasibility studies on complete recovery of rare earths from glass polishing waste",
abstract = " One of the main applications of ceria (CeO 2 ) is its use in glass polishing. About 16,000 tonnes of rare earth oxides, which is about 10% of total rare earth production, are used for polishing applications. The waste generated in glass polishing contains rare earths, along with other impurities. In this study, two different glass polishing waste samples were characterized and two different processes were proposed for the complete recovery of rare earths from polishing waste, i.e., an acid-based process and an alkali-based process. The polishing waste samples were characterized with inductively coupled plasma optical emission spectrometry (ICP-OES), X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), thermo-gravimetric analysis (TGA) and particle size analysis. Chemical analysis showed that sample A (CeO 2 -rich waste from plate glass polishing) contained a high amount of impurities compared to sample B (CeO 2 -rich waste from mirror polishing). XRD analysis showed that sample B contained CeO 2 , LaO 0.65 F 1.7 and LaPO 4 compounds, whereas sample A contained CaCO 3 in addition to rare earth compounds. SEM-EDX analysis showed the presence of alumino-silicates in sample A. Leaching experiments were carried out at 75 ◦ C at different acid concentrations for the recovery of rare earths from polishing waste samples. The leaching results showed that it is difficult to dissolve rare earths completely in acid solutions due to the presence of fluorides and phosphates. Hence, undissolved rare earths in the leach residue were further recovered by an alkali treatment with NaOH. In another approach, polishing waste samples were directly treated with NaOH at 500 ◦ C. After alkali treatment followed by water leaching, rare earths can be completely dissolved during acid leaching. Rare earths from polishing waste can be recovered completely by both the acid-based process and the alkali-based process. ",
keywords = "Characterization, Leaching, Polishing waste, Rare earths, Waste utilization",
author = "Borra, {Chenna Rao} and Vlugt, {Thijs J.H.} and Jeroen Spooren and Peter Nielsen and Yongxiang Yang and Offerman, {S. Erik}",
year = "2019",
doi = "10.3390/met9030278",
language = "English",
volume = "9",
journal = "Metals",
issn = "2075-4701",
publisher = "MDPI",
number = "3",

}

RIS

TY - JOUR

T1 - Characterization and feasibility studies on complete recovery of rare earths from glass polishing waste

AU - Borra, Chenna Rao

AU - Vlugt, Thijs J.H.

AU - Spooren, Jeroen

AU - Nielsen, Peter

AU - Yang, Yongxiang

AU - Offerman, S. Erik

PY - 2019

Y1 - 2019

N2 - One of the main applications of ceria (CeO 2 ) is its use in glass polishing. About 16,000 tonnes of rare earth oxides, which is about 10% of total rare earth production, are used for polishing applications. The waste generated in glass polishing contains rare earths, along with other impurities. In this study, two different glass polishing waste samples were characterized and two different processes were proposed for the complete recovery of rare earths from polishing waste, i.e., an acid-based process and an alkali-based process. The polishing waste samples were characterized with inductively coupled plasma optical emission spectrometry (ICP-OES), X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), thermo-gravimetric analysis (TGA) and particle size analysis. Chemical analysis showed that sample A (CeO 2 -rich waste from plate glass polishing) contained a high amount of impurities compared to sample B (CeO 2 -rich waste from mirror polishing). XRD analysis showed that sample B contained CeO 2 , LaO 0.65 F 1.7 and LaPO 4 compounds, whereas sample A contained CaCO 3 in addition to rare earth compounds. SEM-EDX analysis showed the presence of alumino-silicates in sample A. Leaching experiments were carried out at 75 ◦ C at different acid concentrations for the recovery of rare earths from polishing waste samples. The leaching results showed that it is difficult to dissolve rare earths completely in acid solutions due to the presence of fluorides and phosphates. Hence, undissolved rare earths in the leach residue were further recovered by an alkali treatment with NaOH. In another approach, polishing waste samples were directly treated with NaOH at 500 ◦ C. After alkali treatment followed by water leaching, rare earths can be completely dissolved during acid leaching. Rare earths from polishing waste can be recovered completely by both the acid-based process and the alkali-based process.

AB - One of the main applications of ceria (CeO 2 ) is its use in glass polishing. About 16,000 tonnes of rare earth oxides, which is about 10% of total rare earth production, are used for polishing applications. The waste generated in glass polishing contains rare earths, along with other impurities. In this study, two different glass polishing waste samples were characterized and two different processes were proposed for the complete recovery of rare earths from polishing waste, i.e., an acid-based process and an alkali-based process. The polishing waste samples were characterized with inductively coupled plasma optical emission spectrometry (ICP-OES), X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), thermo-gravimetric analysis (TGA) and particle size analysis. Chemical analysis showed that sample A (CeO 2 -rich waste from plate glass polishing) contained a high amount of impurities compared to sample B (CeO 2 -rich waste from mirror polishing). XRD analysis showed that sample B contained CeO 2 , LaO 0.65 F 1.7 and LaPO 4 compounds, whereas sample A contained CaCO 3 in addition to rare earth compounds. SEM-EDX analysis showed the presence of alumino-silicates in sample A. Leaching experiments were carried out at 75 ◦ C at different acid concentrations for the recovery of rare earths from polishing waste samples. The leaching results showed that it is difficult to dissolve rare earths completely in acid solutions due to the presence of fluorides and phosphates. Hence, undissolved rare earths in the leach residue were further recovered by an alkali treatment with NaOH. In another approach, polishing waste samples were directly treated with NaOH at 500 ◦ C. After alkali treatment followed by water leaching, rare earths can be completely dissolved during acid leaching. Rare earths from polishing waste can be recovered completely by both the acid-based process and the alkali-based process.

KW - Characterization

KW - Leaching

KW - Polishing waste

KW - Rare earths

KW - Waste utilization

UR - http://www.scopus.com/inward/record.url?scp=85063378275&partnerID=8YFLogxK

U2 - 10.3390/met9030278

DO - 10.3390/met9030278

M3 - Article

AN - SCOPUS:85063378275

VL - 9

JO - Metals

JF - Metals

SN - 2075-4701

IS - 3

M1 - 278

ER -

ID: 52798999