Recovering Y and Eu from Waste Phosphors Using Chlorination Roasting—Water Leaching Process
AbstractRecovering Y and Eu from waste phosphors using chlorination roasting followed by a water leaching process was investigated in this study. Firstly, by chlorination roasting and water leaching, Y and Eu elements present in waste phosphors were efficiently extracted into a leach solution. Secondly, the majority of the impurities in the solution can be removed by adjusting the pH to 4.5 using a Na2S and NH3·H2O solution. Thirdly, the rare earths can be precipitated afterwards by adding a H2C2O4 solution and adjusting the pH to 2.0. Then rare earth oxides (REOs) can be obtained after calcining at 800 °C for 1 h. The characterization study of the waste phosphors and the rare earth oxide products was performed by XRD, XRF, and SEM-EDS analysis to determine the phase and morphological features. Influences of the factors, such as roasting temperatures and time, the addition of ammonium chloride on the roasting of waste phosphors, as well as the pH and the amount of oxalates on the precipitation of Y and Eu, were investigated. The maximum grade (99.84%) of mixed rare earth oxides and recovery rate (87.35%) of Y and Eu were obtained at the optimized conditions. View Full-Text
Share & Cite This Article
Yu, M.; Pang, S.; Mei, G.; Chen, X. Recovering Y and Eu from Waste Phosphors Using Chlorination Roasting—Water Leaching Process. Minerals 2016, 6, 109.
Yu M, Pang S, Mei G, Chen X. Recovering Y and Eu from Waste Phosphors Using Chlorination Roasting—Water Leaching Process. Minerals. 2016; 6(4):109.Chicago/Turabian Style
Yu, Mingming; Pang, Shuya; Mei, Guangjun; Chen, Xiaodong. 2016. "Recovering Y and Eu from Waste Phosphors Using Chlorination Roasting—Water Leaching Process." Minerals 6, no. 4: 109.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.