Leaching kinetic study of Y and Eu from waste phosphors using hydrochloric acid solution containing hydrogen peroxide

• Autorzy: Yu M. , Jiang Z. , Mei G. , Chen X.

Identyfikatory

DOI

10.5277/ppmp1808

• Języki publikacji: EN

Abstrakty

EN

The leaching kinetics of Y and Eu from waste phosphors using a hydrochloric acid (HCl) solution containing hydrogen peroxide (H2O2) were investigated. Characterization of the waste phosphors was performed using XRD to ascertain the phases as (Y0.95Eu0.05)2O3 (red phosphors), (Ce0.67Tb0.33)MgAl11O19 (green phosphors), (Ba0.9Eu0.1)Mg2Al16O27 (blue phosphors), and SiO2 (quartz). The influence of factors such as HCl concentration, addition amount of H2O2, temperature, and reaction time on the leaching performance of Y and Eu was investigated. The maximum leaching recoveries of Y (99.87%) and Eu (88.72%) were obtained at 4 M HCl, 0.2 cm3/g H2O2, 60 ℃ temperature, and 180 min of reaction time at a liquid-to-solid ratio of 7.5 cm3/g. Leaching kinetic results showed the best fit with the shrinking sphere model (1-(1-x)1/3)=kct), ensuring that the overall leaching process was governed by a chemical control mechanism. Activation energies of 42.35 and 33.28 kJ/mol were acquired for leaching of Y and Eu, respectively, at 40-70 ℃, which further supports the proposed chemical control leaching process.

Słowa kluczowe

EN

waste phosphors; leaching; kinetics; rare earth elements

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2018
• Tom: Vol. 54, iss. 2
• Strony: 238--248
• Opis fizyczny: Bibliogr. 21 poz., rys., tab.

Twórcy

autor

Yu M.

• Wuhan University of Technology, School of Resources and Environmental Engineering, Wuhan, 430070, China

autor

Jiang Z.

• Wuhan University of Technology, School of Resources and Environmental Engineering, Wuhan, 430070, China

autor

Mei G.

• Wuhan University of Technology, School of Resources and Environmental Engineering, Wuhan, 430070, China
• Hubei University of Education , School of Chemistry and Life Sciences, Wuhan, 430070, China
• Hubei University of Education , School of Chemistry and Life Sciences, Wuhan, 430070, China

autor

Chen X.

• Wuhan University of Technology, School of Resources and Environmental Engineering, Wuhan, 430070, China

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).