| Title | Application of selectrodialysis for the removal of As from metallurgical process waters: Recovery of Cu and Zn |
|---|---|
| ID_Doc | 25644 |
| Authors | Reig, M; Vecino, X; Valderrama, C; Gibert, O; Cortina, JL |
| Title | Application of selectrodialysis for the removal of As from metallurgical process waters: Recovery of Cu and Zn |
| Year | 2018 |
| Published | |
| Abstract | In this work, selectrodialysis (SED) was used to separate arsenic (As(V)) from copper (Cu(II)) and zinc (Zn(II)) of acidic metallurgical process streams by integrating non-selective and selective membranes. The separation process is determined by the chemical speciation of the involved elements. In this case, As(V) is mainly present as anionic species (H2AsO4-), while Cu(II) and Zn(II) are mainly present as cationic species although partially complexed as neutral complexes (CuSO4 and ZnSO4). A lab set-up was used to conduct the experimental tests with different type of standard and monovalent selective ion-exchange membranes. The results obtained showed that by SED configuration it was possible to recover around 80 +/- 0.2% of Cu(II), 87 +/- 0.2% of Zn(II) and 95 +/- 0.3% of As(V) from the feed solution to the rich-product streams with an energy consumption of 2.6 +/- 0.2 kWh/kg CuSO4+ZnSO4. Furthermore, a Cu/Zn-rich stream with a purity of both divalent cations of 99.8% (0.02% of As(V)) was achieved by means of SED. Overall, the results herein gathered suggest that SED is an efficient separation technology for Cu(II) and Zn(II) recovery from mining and metallurgical acidic streams. |
| https://hdl.handle.net/2117/113827 |
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