SrSO4 is the main source of strontium element and widely used by industries as a raw material with narrow crystal size distribution (CSD) to meet excellent physical and chemical properties. An effort has been made to study the effects of various operating parameters such as concentration, temperature, additive (i.e. ethylene disodium salt dihydrate (EDTA)), and power of ultrasound on induction Lime. CSD and morphology during the reactive crystallization of strontium sulfate. The results showed that the induction time was decreased with an increase in the concentration of the reactant, temperature, and power of ultrasound, while an increasing trend observed with an increase in the concentration of EDTA. CSD was observed to be narrower with an increase in the concentration of EDTA and power of ultrasound while broader CSD observed with the initial concentration of the reactants. The temperature did not show the significant effect on CSD. The morphologies observed were the mixture of cuboids and hexagonal plate structures in the presence of ultrasound. (C) 2013 Elsevier B.V. All rights reserved.