Journal of the Korean Society of Mineral and Energy Resources Engineers (한국자원공학회지)

The Korean Society of Mineral and Energy Resources Engineers (한국자원공학회)
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Leaching Behavior of Magnesium from Serpentine in Hydrochloric Acid Solution

염산용액에서 사문석으로부터 마그네슘의 침출거동

Kim, Byung-Su;Yoo, Kyoung-Keun;Kim, Soo-Kyung;Kim, Min-Seuk;Lee, Jae-Chun
김병수;유경근;김수경;김민석;이재천

  • Published : 2008.12.28
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Abstract

The leaching of Mg is well known to be the rate-determining step in the aqueous carbonation process of serpentine mineral for CO2 sequestration. Therefore, the understanding of the kinetics of Mg dissolution is essential to optimize leaching conditions for the effective mineral CO2 sequestration using serpentine mineral. In this study, the dissolution behavior of Mg from domestic serpentine mineral was investigated in HCl solutions. The effects of HCl concentration, leaching temperature and time, and agitation speed on the magnesium dissolution were examined. The complete dissolution in 1.0 M HCl was achieved in 30 minutes at 90℃ and a pulp density of 2 g/L. The dissolution kinetics was studied in relation to the textual structure of serpentine. The dissolution rate data was observed to agree well to Jander’s rate equation. It was verified that the dissolution of Mg from serpentine was limited by the diffusion of H3O+ and Mg2+ ions throughout the thin channels formed between silica layers during the dissolution of Mg. The activation energy was determined to be 86.8 kJ/mol.

사문석의 수용액 탄산화에 의한 이산화탄소의 격리에 있어서, 율속단계는 사문석으로부터 마그네슘의 침출로 알려져 있다. 따라서 사문석을 이용하는 광물 이산화탄소 격리의 최적화를 위하여 마그네슘의 침출거동에 대한 이해가 필수적이다. 본 연구에서는 국내산 사문석으로부터 마그네슘의 염산침출에 대한 연구를 수행하였다. 염산농도, 침출온도 및 시간, 교반속도 등 실험변수가 마그네슘의 침출거동에 미치는 영향을 조사하였다. 사문암에 함유된 마그네슘의 완전한 침출은 염산농도 1.0 M, 침출온도 90℃, 광액농도 2 g/L에서 30분간 침출함으로서 이루어졌다. 사문암의 결정구조를 고려하면서 마그네슘 침출반응의 속도론적 해석을 수행하였으며 Jander 속도식을 잘 따르는 것으로 분석되었다. 마그네슘의 염산침출반응은 활성화 에너지가 86.8 kJ/mol 로서, 실리카 층 사이에 형성된 얇은 통로를 통한 H3O+와 Mg2+이온의 확산에 의하여 지배를 받는 확산율속반응으로 판명되었다.

Keywords

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