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Energies 2016, 9(12), 996;

Leaching of Metal Ions from Blast Furnace Slag by Using Aqua Regia for CO2 Mineralization

CO2 Sequestration Department, Korea Institute of Geoscience and Mineral Resources (KIGAM), 124 Gwahang-no, Yuseong-gu, Daejeon 34132, Korea
Author to whom correspondence should be addressed.
Academic Editor: Vijay Kumar Thakur
Received: 5 September 2016 / Revised: 19 November 2016 / Accepted: 23 November 2016 / Published: 25 November 2016
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Blast furnace slag (BFS) was selected as the source of Ca for CO2 mineralization purposes to store CO2 as CaCO3. BFS was dissolved using aqua regia (AR) for leaching metal ions for CO2 mineralization and rejecting metal ions that were not useful to obtain pure CaCO3 (as confirmed by XRD analysis). The AR concentration, as well as the weight of BFS in an AR solution, was varied. Increasing the AR concentration resulted in increased metal ion leaching efficiencies. An optimum concentration of 20% AR was required for completely leaching Ca and Mg for a chemical reaction with CO2 and for suppressing the leaching of impurities for the production of high-purity carbonate minerals. Increasing the liquid-to-solid ratio (L/S) resulted in the increased leaching of all metal ions. An optimum L/S of 0.3/0.03 (=10) was required for completely leaching alkaline-earth metal ions for CO2 mineralization and for retaining other metal ions in the filtered residue. Moreover, the filtrate obtained using 20% AR and an L/S of 0.3/0.03 was utilized as Ca sources for forming carbonate minerals by CO2 mineralization, affording CaCO3. The results obtained herein demonstrated the feasibility of the use of AR, as well as increasing pH, for the storage of CO2 as high-purity CaCO3. View Full-Text
Keywords: blast furnace slag; CO2 mineralization; calcium leaching blast furnace slag; CO2 mineralization; calcium leaching

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bang, J.-H.; Lee, S.-W.; Jeon, C.; Park, S.; Song, K.; Jo, W.J.; Chae, S. Leaching of Metal Ions from Blast Furnace Slag by Using Aqua Regia for CO2 Mineralization. Energies 2016, 9, 996.

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