AGGLOMERATED CRYSTALS AND THEIR PACKED DE NSITY OF MANGANESE CARBONATE

For the clarification of crystallization conditions to obtain agglomer ated crystals of spherical MnCO3 having high purity and high packed de nsity, the reactive crystallization with MnSO4 and (NH4)(2)CO3 solutio ns in high concentration was carried out using a pilot mixing crystall izer. The crystallization method to obtain spherical and compact agglo merated crystals was determined by applying conditions in which the nu cleation rate was made high by the high degree of supersaturation and nuclei were agglomerated in the agglomeration zone in the crystallizer . Furthermore, for the production of agglomerated crystals having pack ed density larger than 2.6 g/cm(3), the mixing of coarse crystals obta ined from the crystallizer bottom with fine crystals in the over flowi ng solution at the weight ratio of 7 : 3 was found to be suitable.