Abstract: The present invention relates to a replaceable insert adapted to fit within the atomization port of a spray nozzle used to atomize a gas/slurry mixture. The nozzle insert has a configuration which greatly minimizes the build-up of solids on the end of the insert, the forward face of the nozzle as well as around the atomization ports when atomizing a slurry. The improved features of the nozzle insert include (a) the interior fluid conveying passage has a constant diameter through the head of the insert; (b) the downstream end of the head is tapered and ends in a circular knife edge at the spray outlet; and (c) the tapered head extends outwardly from the forward face of the nozzle a distance sufficient for the spray outlet to be positioned beyond eddy currents which form during atomization of the gas/slurry mixture.