pH-swing 공정을 이용한 무해화된 폐석면 슬레이트 분말의 광물탄산화 (Mineral Carbonation of Detoxified Waste Asbestos Slate Powder Using pH-swing Process)

서지정보

· 발행기관 : 한국에너지기후변화학회
· 수록지 정보 : 에너지기후변화학회지 / 19권 / 1호 / 100 ~ 114페이지
· 저자명 : 임병현, 김환철, 김동욱

초록

In this study, experiments were conducted to absorb carbon dioxide and obtain calcium carbonate using detoxified waste asbestos slate powder. First, the material was analyzed using X-ray fluorescence (XRF) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS) to determine the carbonate ion content of the mineral. To determine the optimal conditions for eluting mineral carbonate ions, Ca2+ and Mg2+ ions were eluted by changing pH, stirring time, and solute ratio, and analyzed using ICP-MS. Furthermore, data was collected using a CO2 sensor to analyze the amount of carbon dioxide removed during the mineral carbonation reaction. The quantity of calcium carbonate produced and the carbonation conversion rate based on the solvent were verified through TGA and XRD analysis. Mineral carbonate ions were extracted from the detoxification waste asbestos slate powder at 25 °C for 12 hours at a speed of 400 rpm, and the pH was adjusted to 7. A concentration of 50 g/L of hydrochloric acid was found to be effective for extracting mineral carbonate ions. To implement the pH-swing process, 500 mL of 0.4 M KOH was added, and the reactor was cycled for 8 cycles. Ca2+ and Mg2+ were eluted using 150 grams of detoxification waste asbestos slate powder and HCl (acid). During the mineral carbonation reaction, 0.184 grams of CaCO3 were produced per gram of DWAS, resulting in the production of 12.14 grams of calcium carbonate. Carbon dioxide was absorbed. The X-ray diffraction (XRD) analysis revealed that the CaCO3 content measured 97.6%. Therefore, carbonating pH-swing minerals with detoxification waste, such as asbestos slate powder, can absorb CO2 and produce calcium carbonate. Through this study, it was confirmed that it is possible to produce CaCO3 using CO2 from gases emitted from power plants (LNG) after detoxifying waste asbestos slate that has not been processed domestically. It is expected that the CaCO3 generated at this time will create high added value, and the fixed CO2 is expected to be used in carbon dioxide reduction policies.

영어초록

In this study, experiments were conducted to absorb carbon dioxide and obtain calcium carbonate using detoxified waste asbestos slate powder. First, the material was analyzed using X-ray fluorescence (XRF) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS) to determine the carbonate ion content of the mineral. To determine the optimal conditions for eluting mineral carbonate ions, Ca2+ and Mg2+ ions were eluted by changing pH, stirring time, and solute ratio, and analyzed using ICP-MS. Furthermore, data was collected using a CO2 sensor to analyze the amount of carbon dioxide removed during the mineral carbonation reaction. The quantity of calcium carbonate produced and the carbonation conversion rate based on the solvent were verified through TGA and XRD analysis. Mineral carbonate ions were extracted from the detoxification waste asbestos slate powder at 25 °C for 12 hours at a speed of 400 rpm, and the pH was adjusted to 7. A concentration of 50 g/L of hydrochloric acid was found to be effective for extracting mineral carbonate ions. To implement the pH-swing process, 500 mL of 0.4 M KOH was added, and the reactor was cycled for 8 cycles. Ca2+ and Mg2+ were eluted using 150 grams of detoxification waste asbestos slate powder and HCl (acid). During the mineral carbonation reaction, 0.184 grams of CaCO3 were produced per gram of DWAS, resulting in the production of 12.14 grams of calcium carbonate. Carbon dioxide was absorbed. The X-ray diffraction (XRD) analysis revealed that the CaCO3 content measured 97.6%. Therefore, carbonating pH-swing minerals with detoxification waste, such as asbestos slate powder, can absorb CO2 and produce calcium carbonate. Through this study, it was confirmed that it is possible to produce CaCO3 using CO2 from gases emitted from power plants (LNG) after detoxifying waste asbestos slate that has not been processed domestically. It is expected that the CaCO3 generated at this time will create high added value, and the fixed CO2 is expected to be used in carbon dioxide reduction policies.

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