Desulfurization and Drying Characteristic of Ca(OH)_2 Slurry

Thermobalance was employed to study the drying characteristic and desulfurization of Ca(OH)_2 slurry at low temperature (80 °C). The experimental results show that the drying characteristic is different under the different mass ratio of H_2O/Ca(OH)_2 and SO_2 concentration. When the Ca(OH)_2 slurry is dried in the atmosphere of SO_2, drying rate would be slower because of more crystals of CaSO_3·0.5H_2O precipitating on the surface of the slurry. The critical moisture content is different under the different drying conditions. It could be found from experimental results that the more the crystals precipitating on the surface of the slurry, the larger the critical moisture content. The Ca(OH)_2 conversion increases with the increasing of SO_2 concentration when SO_2 concentration is low. The Ca(OH)_2 conversion increases slowly with the increasing SO_2 concentration when SO_2 concentration is high.