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Open AccessArticle

Cavitation-Dispersion Method for Copper Cementation from Wastewater by Iron Powder

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Scientific Laboratory of Powder Materials, Faculty of Civil Engineering, Riga Technical University, 6B Kipsalas Street, Room 331a, LV-1048 Riga, Latvia
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Department of Metals and Corrosion Engineering, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6-Dejvice, Czech Republic
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Department of Mechanical and Industrial Engineering, School of Engineering, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia
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Rudolfs Cimdins Riga Biomaterials Innovations and Development Centre of RTU, Institute of General Chemical Engineering, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Pulka 3, LV-1007 Riga, Latvia
*
Author to whom correspondence should be addressed.
Metals 2018, 8(11), 920; https://doi.org/10.3390/met8110920
Received: 30 September 2018 / Revised: 22 October 2018 / Accepted: 29 October 2018 / Published: 8 November 2018
The circular economy for sustainable economic deployment is strongly based on the re-use of secondary products and waste utilization. In the present study, a new effective cementation method for recovering valuable metallic copper from industrial wastewater using Fe0 powders is reported. A high-speed mixer-disperser (HSMD) capable of providing a cavitation effect was used for the rapid intake, dispersion, and mixing of Fe0 powder in an acidic wastewater solution (pH ≈ 2.9) containing copper ions mainly in the form of CuSO4. Three iron powders/particles were tested as the cementation agent: particles collected from industrial dust filters (CMS), water-atomized iron-based powder AHC100.29, and sponge-iron powder NC100.24. The effects of mixing regimes and related mixing conditions on the effectiveness of the Cu cementation process were evaluated by comparison between the HSMD and a laboratory paddle mixer. It was observed that the use of cavitation provided more efficient copper removal during the copper cementation process in comparison to the standard experiments with the propeller mixer. Under the cavitation regime, about 90% of copper was cemented in the first five minutes and the final copper removal of 95% was achieved using all three Fe0 powders after seven minutes of cementation. In comparison, only around 55% of copper was cemented in the first seven minutes of cementation using the traditional mixing method. View Full-Text
Keywords: cementation; copper removal; cavitation cementation; copper removal; cavitation
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Shishkin, A.; Mironovs, V.; Vu, H.; Novak, P.; Baronins, J.; Polyakov, A.; Ozolins, J. Cavitation-Dispersion Method for Copper Cementation from Wastewater by Iron Powder. Metals 2018, 8, 920.

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