The particle size distribution of the ground particles had a narrow peak around 20 nm that was measured by the dynamic light scattering method.

Theories and Applications of Chem. Eng., 2009, Vol. 15, No. 1 239

화학공학의 이론과 응용 제15권 제1호 2009년

분쇄에 의한 나노탄산칼슘의 합성 및 분산 조 국, 장한권, 길대섭, 김한수, 장희동^*

KIGAM ([email protected]^*)

A one-step grinding process to obtain CaCO₃ nanoparticles from a micrometer-sized CaCO₃ was studied. A high-speed beads mill was employed to grind the particles, and poly(acrylic acid, sodium salt) was used to disperse the ground particles. The main parameters, which were investigated, were the slurry concentration, rotor speed, bead size, and surfactant concentration. The larger bead size, higher slurry concentration, and faster rotor speed showed higher grinding efficiencies. However, there was severe agglomeration of the ground particles resulting in larger secondary particles as the grinding time increased after the certain point. The dispersion and enhanced grinding of particles were achieved by the surfactant. The particle size distribution of the ground particles had a narrow peak around 20 nm that was measured by the dynamic light scattering method.