Development of continuous precipitation process with crystal forms controlled by ionic strength

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Although fine particles are commonly produced by precipitation or crystallization in the industry , it is still difficult to predict and control the shape, size distribution, and crystal form of the resulting particles. In this study , continuous precipitation of calcium oxalate which exhibits pseudopolymorphism was carried out. Effects of pH and ion strength of the reactant solution were investigated quantitatively and attempted to control the crystal form. How the crystal form of calcium oxalate changes during crystal growth was found.