Synthesis of copper nanoparticles from refractory sulfides using a semi-industrial mechanochemical approach
| Autor: | M. Rajňák, Matej Tešinský, Nina Daneu, Peter Baláž, Milan Škrobian, Julien Marquardt, Matej Baláž |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Chalcocite
Materials science General Chemical Engineering chemistry.chemical_element 02 engineering and technology engineering.material Covellite 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Copper Nanocrystalline material 0104 chemical sciences chemistry Chemical engineering Mechanics of Materials visual_art Mechanochemistry engineering visual_art.visual_art_medium 0210 nano-technology Ternary operation Cuprospinel Ball mill |
| Zdroj: | Advanced Powder Technology. 31:782-791 |
| ISSN: | 0921-8831 |
| Popis: | The large-scale mechanochemical reduction of binary sulfides chalcocite (Cu2S) and covellite (CuS) by elemental iron was investigated in this work. The reduction of Cu2S was almost complete after 360 min of milling, whereas in the case of CuS, a significant amount of non-reacted elemental iron could still be identified after 480 min. Upon application of more effective laboratory-scale planetary ball milling, it was possible to reach almost complete reduction of CuS. Longer milling leads to the formation of ternary sulfides and oxidation product, namely cuprospinel CuFe2O4. The rate constant calculated from the magnetometry measurements using a diffusion model for Cu2S and CuS reduction by iron in a large-scale mill is 0.056 min−0.5 and 0.037 min−0.5, respectively, whereas for the CuS reduction in a laboratory-scale mill, it is 0.1477 min−1. The nanocrystalline character of the samples was confirmed by TEM and XRD, as the produced Cu exhibited sizes up to 16 nm in all cases. The process can be easily scaled up and thus copper can be obtained much easier from refractory minerals than in traditional metallurgical approaches. |
| Databáze: | OpenAIRE |
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