CO2를 탄산염의 형태로 고정화하는 광물 탄산화 기술은 CO2 지중 저장의 대안 기술의 하나로 중소규모로 CO2 저장을 실현할 수 있는 기술로 여겨지고 있다. 이 연구에서는 광물 탄산화 기술의 전세계적인 연구 개발 동향을 파악하고, 특히 우리 나라의 지질 및 산업 여건을 고려할 때 CO2 광물 탄산화가 CO2 저감 대책이 될 수 있는지에 대한 기술적 및 경제적 타당성을 검토하였다. 그 결과 국내에서는 연간 1,200만톤 이상의 CO2를 고정화할 수 있는 산업 부산물이 발생하고 있으며, 이를 광물탄산화에 이용한다면 CO2 광물탄산화는 유망한 CO2 저감 방안이 될 수 있을 것으로 기대된다. 이 기술의 경제성 증대를 위해서는 산업 부산물의 전처리, 금속 용출액 및 용출 방법, 고속 탄산화 기술 개발,공정열의 이용 극대화, 생성된 탄산화물의 부가가치 향상 등의 분야에서 향후 추가적인 연구 개발이 필요할 것으로 판단된다.

CO2 mineral carbonation technology, fixation technology of CO2 as carbonates, is considered to be an alternative to the CO2 geological storage technology, which can perform small- or medium-scale CO2 storage. We provide the current R&D status of the mineral carbonation with special emphasis on the technical and economical feasibility of CO2 mineral carbonation taken into consideration of the domestic geological and industrial environment. Given that the domestic industry produces relatively large amount of the industrial by-products, it is expected that the technology play a pivotal role on the CO2 reduction countermeasure, reaching the potential storage capacity to 12Mt-CO2/yr. The economics of the overall process should be improved via the development of advanced technologies on the pretreatment of raw materials, method/solvents for metal extraction, enhanced kinetics of carbonation reactions, heat integration, and the production of highly value-added carbonates.

words: Carbon Dioxide Reduction Mineral Carbonation Industrial by-Products

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