A Novel Method for Preparing Calcium Carbonate Particles: Thermal Decomposition from Calcium Hydrogen Carbonate Solution

An entirely novel preparation method of calcium carbonate (CaCO3) from calcium hydrogen carbonate (Ca (HCO3)2) solution was presented and named as thermal decomposition. The variation of the polymorphs and morphologies of CaCO3 particles with reaction temperature was investigated. XRD result indicates that high temperature favors the formation of calcite. Cubic or rhombohedra calcite crystals, lamellar and spherical vaterite crystals and rod– and needle–like aragonite crystals are found in powder synthesized at different temperatures. The reaction process was also discussed in the present work.