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- W2381661001 abstract "This paper made an experimental study of Cr(Ⅵ)-bearing wastewater treated by natural pyrite. XPS peaks of Cr- 2p apparently appeared on the pyrite surface and colloidal precipitates during and after the reaction, which can be fitted into three peaks at different binding energies of 574.7～575.1 eV, 576.6～576.9 eV and 578.2～578.7 eV. The relative peaks represent the phases of Cr_2S_3, Cr_2O_3 and CrO_3, respectively. The precipitate phase of Cr_2S_3 was found for the first time in this experiment. The results show that the phase of chromium-bearing sulfides can be produced in aqueous media under the conditions of room temperature and normal ambient pressure. Taking full advantage of this chromium-bearing sulfide phase, we can utilize natural pyrite including pyrrhotite to transfer Cr (Ⅲ) precipitates directly into colloidal precipitates without adding base in the process of reducing Cr(Ⅵ). The content of total chromium in the upper treated supernatant is lower than that of the National Standards of Sewage Treatment. The heavy metals dissolved by natural pyrite itself are very low in content so that they don't affect the effluent quality. In order to apply and extend the new technology for one-step treatment of Cr(Ⅵ)-bearing wastewater in which Cr (Ⅵ) was reduced and Cr (Ⅲ) was precipitated simultaneously by natural pyrite and pyrrhotite, we should exploit and apply chromium-bearing precipitate phase." @default.
- W2381661001 created "2016-06-24" @default.
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- W2381661001 date "2005-01-01" @default.
- W2381661001 modified "2023-09-25" @default.
- W2381661001 title "The discovery of Cr_2S_3 phase during the treatment of Cr(VI) by natural pyrite" @default.
- W2381661001 hasPublicationYear "2005" @default.
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