RECOVERY OF CACL2 FROM EXHAUST GAS-DESULFURIZING WASTE LIQUID

摘要

PURPOSE:To enable to recover CaCl2 in a state having a high commercial value in a simplified process, by injecting the spray of exhaust gas-desulfurizing waste liquid and hot air into a drying chamber, introducing the powdery body of spray- dried CaCl2 into a cyclone, and then separating it. CONSTITUTION:Desulfurizing waste liquid to be treated is carried through a line A to a thickener 1, while clarified liquid 3 is transfused into a raw liquid tank 4, forcedly fed by a raw liquid pump 5 and injected through a nozzle 6 into a drying chamber 7. On the other hand, fuel and air for combustion are injected along lines C and D, respectively, to the burner 10 of a hot air-forming oven 9, while a large amount of air is injected along a line E from a blower 11. Hot air is forcedly injected into the drying chamber 7 through its top part, to heat and dry the atomized raw liquid sprayed from the nozzle 6. The dried powdery body 13 settled on the bottom of the drying chamber is fed through a pipe line 15 to a cyclone 16 by pressure inside the chamber and high-pressure air supplied from a fan 14, separated from the gas and then let fall down in a reserving chamber 17. The recovered CaCl2 having falled down is received through a damper 19 in a product tank 23.