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Factors affecting the precipitation of pure calcium carbonate during the direct aqueous carbonation of flue gas desulfurization gypsum

Author

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  • Song, Kyungsun
  • Jang, Young-Nam
  • Kim, Wonbaek
  • Lee, Myung Gyu
  • Shin, Dongbok
  • Bang, Jun-Hwan
  • Jeon, Chi Wan
  • Chae, Soo Chun

Abstract

The mineral carbonation of FGD (flue gas desulfurization) gypsum was carried out through CO2 sorption into ammonia solution containing FGD gypsum. High-purity calcium carbonate was precipitated from DCC (dissolved calcium carbonate) solution which was extracted during the induction period. The factors affecting the preparation of pure calcium carbonate were examined under the following conditions: CO2 flow rate (1–3 L/min), ammonia content (4–12%), and S/L (solid-to-liquid) ratio (5–300 g/L). X-Ray diffraction study revealed that the PCC (precipitated calcium carbonate) was round-shaped vaterite. The induction time for PCC decreased as the CO2 flow rate increased. The maximum formation efficiency for pure PCC was seen to increase linearly with the ammonia content. The formation efficiency for pure PCC was the highest (90%) for S/L ratio of 5 g/L but it decreased as S/L ratio increased. On the other hand, S/L ratio didn't affect the maximum solubility limit of DCC. It is believed that the pure PCC would add an economic value to the FGD gypsum carbonation for industrial CO2 sequestration.

Suggested Citation

  • Song, Kyungsun & Jang, Young-Nam & Kim, Wonbaek & Lee, Myung Gyu & Shin, Dongbok & Bang, Jun-Hwan & Jeon, Chi Wan & Chae, Soo Chun, 2014. "Factors affecting the precipitation of pure calcium carbonate during the direct aqueous carbonation of flue gas desulfurization gypsum," Energy, Elsevier, vol. 65(C), pages 527-532.
    • Handle: RePEc:eee:energy:v:65:y:2014:i:c:p:527-532
    DOI: 10.1016/j.energy.2013.11.008
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    1. Lee, Myung gyu & Jang, Young Nam & Ryu, Kyung won & Kim, Wonbeak & Bang, Jun-Hwan, 2012. "Mineral carbonation of flue gas desulfurization gypsum for CO2 sequestration," Energy, Elsevier, vol. 47(1), pages 370-377.
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    Cited by:

    1. Chan-Ung Kang & Sang-Woo Ji & Hwanju Jo, 2022. "Recycling of Industrial Waste Gypsum Using Mineral Carbonation," Sustainability, MDPI, vol. 14(8), pages 1-13, April.
    2. Gong, Xuzhong & Zhang, Tong & Zhang, Junqiang & Wang, Zhi & Liu, Junhao & Cao, Jianwei & Wang, Chuan, 2022. "Recycling and utilization of calcium carbide slag - current status and new opportunities," Renewable and Sustainable Energy Reviews, Elsevier, vol. 159(C).

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