| 摘要 |
PURPOSE:To obtain granulated quick lime having high reactivity and uniform particle diameters efficiently, stably and inexpensively, by attaching dry mud of lime slurry to a nucleus substance for granulation to form pellets, thermally decomposing the pellets and calcining. CONSTITUTION:Lime slurry discharged from a caustification process in a kraft pulp manufacturing process is blended with green liquor, dehydrated by a mud filter 1 to give mud cake, which is sent to a paddle mixer 3, ground by a cage mill 4, dried under heating at about 450 deg.C and then dried by cyclones 5 and 6 to give dry mud of lime slurry. The dry mud is continuously fed through a dried lime slurry feed bin 7 to a fluidized calcining furnace 11 kept at 750-800 deg.C by combustion of heave oil and attached to a nucleus substance for granulation, which is successively supplied from the top of the furnace 11 and has 0.5-4mm particle diameters under 1,500-2,300mm H2O pressure condition to form pellets. Then, the pellets are thermally decomposed at <=830 deg.C at an upper fluidized bed 15 in the furnace 11 exhausted to 0--100mm H2O by an exhaust fan to granulate quick lime particles having 1.2-3mm particle diameters, which are discharged through a lower fluidized bed 16 from a pellet outlet pipe 19 to give granulated quick lime having >=90% purity.
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