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Leaching of Metal Ions from Blast Furnace Slag by Using Aqua Regia for CO 2 Mineralization

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  • Jun-Hwan Bang

    (CO 2 Sequestration Department, Korea Institute of Geoscience and Mineral Resources (KIGAM), 124 Gwahang-no, Yuseong-gu, Daejeon 34132, Korea)

  • Seung-Woo Lee

    (CO 2 Sequestration Department, Korea Institute of Geoscience and Mineral Resources (KIGAM), 124 Gwahang-no, Yuseong-gu, Daejeon 34132, Korea)

  • Chiwan Jeon

    (CO 2 Sequestration Department, Korea Institute of Geoscience and Mineral Resources (KIGAM), 124 Gwahang-no, Yuseong-gu, Daejeon 34132, Korea)

  • Sangwon Park

    (CO 2 Sequestration Department, Korea Institute of Geoscience and Mineral Resources (KIGAM), 124 Gwahang-no, Yuseong-gu, Daejeon 34132, Korea)

  • Kyungsun Song

    (CO 2 Sequestration Department, Korea Institute of Geoscience and Mineral Resources (KIGAM), 124 Gwahang-no, Yuseong-gu, Daejeon 34132, Korea)

  • Whan Joo Jo

    (CO 2 Sequestration Department, Korea Institute of Geoscience and Mineral Resources (KIGAM), 124 Gwahang-no, Yuseong-gu, Daejeon 34132, Korea)

  • Soochun Chae

    (CO 2 Sequestration Department, Korea Institute of Geoscience and Mineral Resources (KIGAM), 124 Gwahang-no, Yuseong-gu, Daejeon 34132, Korea)

Abstract

Blast furnace slag (BFS) was selected as the source of Ca for CO 2 mineralization purposes to store CO 2 as CaCO 3 . BFS was dissolved using aqua regia (AR) for leaching metal ions for CO 2 mineralization and rejecting metal ions that were not useful to obtain pure CaCO 3 (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 CO 2 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 CO 2 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 CO 2 mineralization, affording CaCO 3 . The results obtained herein demonstrated the feasibility of the use of AR, as well as increasing pH, for the storage of CO 2 as high-purity CaCO 3 .

Suggested Citation

  • Jun-Hwan Bang & Seung-Woo Lee & Chiwan Jeon & Sangwon Park & Kyungsun Song & Whan Joo Jo & Soochun Chae, 2016. "Leaching of Metal Ions from Blast Furnace Slag by Using Aqua Regia for CO 2 Mineralization," Energies, MDPI, vol. 9(12), pages 1-13, November.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:12:p:996-:d:83796
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    References listed on IDEAS

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    Cited by:

    1. Guanrun Chu & Lin Wang & Weizao Liu & Guoquan Zhang & Dongmei Luo & Liming Wang & Bin Liang & Chun Li, 2019. "Indirect mineral carbonation of chlorinated tailing derived from Ti‐bearing blast‐furnace slag coupled with simultaneous dechlorination and recovery of multiple value‐added products," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 9(1), pages 52-66, February.
    2. Chu, Guanrun & Li, Chun & Liu, Weizao & Zhang, Guoquan & Yue, Hairong & Liang, Bin & Wang, Ye & Luo, Dongmei, 2019. "Facile and cost-efficient indirect carbonation of blast furnace slag with multiple high value-added products through a completely wet process," Energy, Elsevier, vol. 166(C), pages 1314-1322.

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