CaCO3 film synthesis from ladle furnace slag: morphological change, new material properties, and Ca extraction efficiency
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A rapidly air-cooled ladle furnace slag (RA-LFS), which is a type of steelmaking slag discharged from a steel mill, was used to synthesize CaCO3 film. The CaCO3 film with 35 cm2/of surface area was synthesized under atmospheric conditions, and the surface morphology of the CaCO3 films was changed by using additives (CaCl2 and ethylene glycol). Especially, the addition of CaCl2 changed the surface morphology of CaCO3 film with pore and induced new material properties, such as water adsorption. The (012) face of CaCO3 film (calcite) was rapidly decreased by the addition of CaCl2. The major components of RA-LFS were calcium (type of CaO, 53.9wt%) and aluminum (type of Al2O3, 37.9wt%), and the major crystal phases of RA-LFS were C3S, C12A7, and C3A. The calcium extraction efficiency of RA-LFS was significantly increased after the CaCO3 film synthesis. The material properties (hardness and elastic modulus) and the thermal characteristics of the CaCO3 films were analyzed by nano-indentation and thermogravimetry–differential thermal analysis. The synthesized CaCO3 films from RA-LFS and Ca(OH)2 (reagent) showed similarities in terms of their material properties and the decomposition temperature.
Keywordscarbon dioxide ladle furnace slag carbonation calcium carbonate film calcium efficiency
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This research was supported by the Basic Research Project of the Korea Institute of Geoscience and Mineral Resources funded by the Ministry of Science, Information & Communication Technology and Future Planning of Korea.
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