STEAM DRYING AND FLUIDIZED-BED CALCINATION OF LIME MUD - RESULTS OF EXTENDED PILOT-STUDIES

The lime obtained from calcination of steam-dried lime mud in a pilot- scale fluidized bed is compared with lime from conventional full-scale calciners. The pilot plant was operated at 840-980 degrees C, with a residence time of 2 h. Lime pellets from the pilot plant had good stre ngth. Laboratory results confirm the correlation between the specific surface area of calcined (reburned) lime and the specific filtration r esistance of the lime mud produced during causticization. Results show that the surface area of lime produced in a fluidized-be calciner can be controlled by the bed temperature.