Patent ID: 7628964

Claim:
An apparatus for treating lime mud comprising: a rotatable kiln including a kiln shell having a center axis, a first shell end into which lime mud is introduced and from which flue gas from calcining lime mud within a calcination space in the kiln shell is discharged, and a second shell end from which calcined lime mud is discharged; a first separator device for separating pretreated lime mud from the flue gas; a riser duct simultaneously conveying the flue gas and lime mud introduced into the flue gas to the separator, said riser duct having a first duct end connected via a kiln exit gas duct to the kiln and a second duct end connected to the separator; a feeder adapted to dose lime mud into the riser duct, wherein the feeder is arranged so that lime mud to be pretreated is introduced into the riser duct at a point located inside the kiln shell or in close proximity to the kiln shell, and a conveyor adapted to convey pretreated lime mud to the kiln for calcining therein.