鹽酸溶液에서 蛇紋石으로부터 마그네슘의 浸出擧動
Leaching Behavior of Magnesium from Serpentine in Hydrochloric Acid Solution
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초록
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.
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.
참고문헌 (24)
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