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DOI : 10.17640/KSWST.2023.31.6.333 , Vol.31, No.6, 333 ~ 343, 2023
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| Title |
| Characteristics of Manufacted Precipitated Calcium Carbonate Using CO2 Supersaturated Water |
| 박나리 Nari Park , 김미선 Miseon Kim , 장향연 Hyangyoun Chang , 김원재 Weonjae Kim , 정진홍 Jinhong Jung |
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| Abstract |
| The development of carbon capture, utilization, and storage technology is crucial in mitigating greenhouse gas emissions in response to climate change. Specifically, the mineral carbonation process offers a stable means of storing CO2 gases. This study delves intothe basic characteristics of precipitated calcium carbonate (PCC) production using CO2 supersaturated water. Initially, a jar test was conducted with NaHCO3 saturated solution by injecting NaOH, and CaCl2 to generate PCC. The results indicated that when CaCl2 was injected, the pH rapidly decreased due to the CaCO3 production reaction. It was crucial to incrementally control the injection of the calcium source and the alkali chemical step. The total carbonate removal rate reached 99.9% within 1 hour of reaction time. Based on the experimental findings, a semi-pilot plant of the PCC production system (capacity: 7.2 ㎥/day) was designed and operated with CO2 supersaturated water. The polymorphs and particle size of CaCO3 were evaluated based on the flow rate of CO2 supersaturated water (2, 5 L/min) and each pH value (9.5, 10.0, and 10.5). PCC particles recovered under both flow rates were a mixture of calcite and vaterite. The average particle size of vaterite at 2 L/min (10.4-12.1 ㎛) was smaller than that at 5 L/min (13.0-15.2 ㎛). At 2 L/min, it was possible to separate the PCC mixture by size inserial hopper locations. As pH increased in the pH range of 9.5-10.5, the proportion of calcite tended to increase. In addition, more than 99% of the injected Ca2+ concentration was consumed in pH 9.5-10.5. |
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| Key Words |
| Calcite, CCUS, PCC, precipitated calcium carbonate, Utilization of CO2, Vaterite, 칼사이트, 침강탄산칼슘, CO2 활용, 배터라이트 |
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