Abstract
The vitrification processes and characteristics of Geochang granite stone sludge were investigated for the application of desulfurization sorbent of Molten Carbonate Fuel Cell (MCFC). From the X-ray fluorescence analysis (XRF) results using Geochang granite stone sludge, it was confirmed that the network formers (SiO₂ and Al₂O3) in granite stone sludge were present between 83.2 and 87.2 wt% and the rest was comprised of network modifiers (K₂O, Na₂O, CaO, Fe₂O3 and MgO). When Borax (Na₂B₄OSUB7/SUB-10H₂O) was added in the granite stone sludge system for promoting the decomposition and reducing the melting viscosity of refractory SiO₂ and Al2O3 comprising of stone sludge, it was observed that the melting point of the granite stone sludge system was reduced by more than 400°C and the optimized melting temperature for granite stone and borax systems was around 1400°C when comparing X-ray diffraction analysis (XRD) results. Phase transitions and thermal reactions of granite stone sludge systems were also investigated from thermal analysis using Thermogravimetric Analysis (TGA)/ Differential Scanning Calorimeter (DSC).
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