Abstract: A flue gas scrubber for removing sulfur from flue gas. This scrubber, whether a horizontal or a vertical scrubber and whether a dry or a semi-dry scrubber, incorporates a recycle line that separates heavier dry solid particles from the finer particles still entrained within the cleaned flue gas. This recycle conduit then delivers these removed dry solid particles back to the scrubber for re-injection therein so as to reduce the drying time of the reagent slurry sprayed within the scrubber. Such drying time is reduced by the recycle of these dry solids because of the increased surface area overwhich the reagent is now sprayed.