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Recovery of zinc in phosphor wastes via electrokinetic treatments

2006; Elsevier BV; Volume: 156-158; Linguagem: Inglês

10.1016/j.elspec.2006.11.054

1873-2526

Ming Yu, H. Paul Wang, Chung‐Yu Chen, Tung-Li Hsiung, Yu‐Ling Wei, Hua‐Shan Tai, Kai-wei Chiang,

Geophysical and Geoelectrical Methods

Speciation of zinc in phosphor wastes during electrokinetic treatments has been studied by in situ X-ray absorption near edge structure (XANES) spectroscopy in the present work. The least-square fits of the in situ XANES spectra show that the major zinc species in the phosphor waste are ZnS (77%), ZnO (10%), and Zn(OH)2 (13%). During the electrokinetic treatment for 90 min, 25% of ZnS and 4% of ZnO are dissolved. About 42% of zinc is enriched on the cathode under the electric field (5 V/cm). Prolonging the electrokinetic treatment time to 4 h under the electric field of 5 V/cm, at least 80% of zinc in the phosphor waste can be recovered.