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- Title
Green and efficient recovery of valuable metals from waste copper slag via co-modification with CaO and Na2O.
- Authors
Liu, Yang; Xu, Lei; Chen, Min
- Abstract
In this work, a novel carbon-free smelting reduction process is proposed to recover valuable metals from molten copper slag, in which secondary aluminum dross is used as the reductant via co-modification with CaO and Na 2 O additions. The influence of Na 2 O addition on the metal recovery and slag properties under different CaO/SiO 2 ratios was investigated at 1550 °C. The results show that the modifier Na 2 O not only reduces the melting temperature of the slag, but also inhibits the precipitation of spinel and prevents the polymerization of aluminosilicate units to a certain extent by providing more O2-, which results in a relatively lower slag viscosity. These effects are more significant at the CaO/SiO 2 of 0.9. The multiple strengthening mechanisms improve the kinetic conditions for smelting reduction, resulting in optimal results when the Na 2 O addition reaches 4 wt% at the CaO/SiO 2 of 0.9, at which 99.1% of iron and 98.5% of copper in the slag can be recovered as the high-purity alloy. The leaching toxicity of the tailings is 2–3 orders of magnitude lower than the original slag, suggesting that they are clean sources for ceramic production. Furthermore, the assessment of the proposed process indicates that it is technically feasible even without an external energy supply, which indicates that the process is green, efficient, and cost-effective. [Display omitted]
- Subjects
COPPER slag; METAL wastes; METAL tailings; LIQUID metals; SLAG; IRON; POWER resources
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2023, Vol 180, p959
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2023.10.061