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- W4308792365 abstract "Hazardous selenium waste (HSW) contains the highly toxic element selenium and valuable metal, which will cause serious environmental pollution and devaluation without being handled properly. The development of a green approach to efficiently manufacture high-purity selenium from hazardous selenium waste is indispensable. However, Cu2Se, PbSe, and PbTe are the biggest stumbling blocks during the purification process of selenium. Thus, pre-oxidation combined with vacuum distillation was proposed. In this study, the evolution mechanisms of typical impurities are investigated in the pre-oxidation process by X-ray diffractometer, Scanning Electronic Microscopy, and X-ray photoelectron spectroscopy. The results showing the oxidation paths of Cu2Se, PbSe, PbTe are as follows: Cu2Se(s) → CuSeO3·2H2O(s), PbSe(s) → PbSeO3(s) → PbSeO4(s), PbTe(s) → PbSeO4(s) + H2TeO3(aq). The difference in saturated vapor between Se and impurities increased after pre-oxidation of HSW because they converted to selenite and tellurous acid with low volatility. Thus, a 10 kg scale-up experiment was successfully achieved, and high-purity selenium (Se 99.993 pct) was extracted by pre-oxidation and vacuum distillation. Overall, this study provides an environmentally friendly process to triumphantly realize the high-value utilization of HSW and industrial applications." @default.
- W4308792365 created "2022-11-15" @default.
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- W4308792365 date "2022-11-11" @default.
- W4308792365 modified "2023-09-26" @default.
- W4308792365 title "Phase Control of Typical Impurities in Hazardous Selenium Waste and Preparation of High-Purity Selenium During Pre-oxidation and Vacuum Distillation Process" @default.
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- W4308792365 doi "https://doi.org/10.1007/s11663-022-02658-4" @default.
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