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

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• 作者：Kyungsun Song ; Young-Nam Jang ; Wonbaek Kim ; Myung Gyu Lee ; Dongbok Shin ; Jun-Hwan Bang ; Chi Wan Jeon ; Soo Chun Chae
• 关键词：Mineral carbonation ; Flue gas desulfurization (FGD) gypsum ; Pure precipitated calcium carbonate (PCC) ; Vaterite
• 刊名：Energy
• 出版年：1 February, 2014
• 年：2014
• 卷：65
• 期：Complete
• 页码：527-532
• 全文大小：1036 K

文摘

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聽L/min), ammonia content (4-12%), and S/L (solid-to-liquid) ratio (5-300聽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聽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.