Feeding device for feeding burned lime to a reaction vessel for
causticizing soda liquor to caustic soda. The feeding device, in its
upper part, has an inlet for receiving slurry of the burned lime and the
soda liquor for formation of said slurry inside said feeding device. The
system further comprises a tall and slender feed vessel having a lower
part having an outlet defined therein for the slurry. The outlet, via a
pump, is operatively connected to the reaction vessel. The process and
the feeding system utilize the feeding device, in which process the
slurry is created of the burned lime and a first part of the soda liquor,
a second part being preheated before addition to the slurry, whereafter
slaking and causticizing reactions are completed under elevated
temperature and pressure.