Domestic dolomite sorbents for the SO2 removal were prepared and the characteristics of sorbents were
investigated by TGA, XRD, SEM and BET. To improve SO2 capture capacity, the dolomite sorbents were calcined,
hydrated and recalcined at various conditions. The specific surface area of hydrated sorbents increased with increasing
stirring rate, hydration temperature and hydration time. In this work, the hydration process by using ultrasonic wave was
conducted at the hydration temperature of 100 o
C for the hydration time of 100-120 min. The specific surface area of
sorbent hydrated at the above condition, was increased by 25%, compared to that of unhydrated sorbent and the hydrated
sorbent exhibited SO2 removal capacity of 16 times higher than unhydrated sorbent. The effect of particle size for the
sulfidation was examined. As a result, the highest SO2 removal capacity could be achieved at the particle size of
32-60 µm. The SO2 removal capacity of sorbent below 32 µm decreased due to sintering at about 850 o
C.