Crystallization of Nano‐Calcium Carbonate: The Influence of Process Parameters

Abstract

Precipitated calcium carbonate was synthesized by carbonation of calcium hydroxide in the presence and absence of ultrasound (conventional stirring) at atmospheric as well as at elevated pressures and different initial concentrations of Ca(OH) 2 . Spherical morphology of the formed calcite was favored at high Ca(OH) 2 concentrations and low CO 2 pressures. The presence of ultrasound did not show any influence on the reaction rate in case of efficient mixing. A small increase of the reaction rate was observed at lower CO 2 pressures. Elevated pressures in combination with ultrasound did not lead to notable changes of reaction rate or particle morphology.

Effects of Montmorillonite on the Mineralization and Cementing Properties of Microbiologically Induced Calcium Carbonate

“…Figure 4 showed that thermal decomposition behavior of calcium carbonate was similar. The whole decomposition process was accompanied by three weight loss stages [25]. The first one before 385 ∘ C was associated with the loss of crystal water.…”

Nonclassical and Classical Crystallization: The Formation of Spindle-Shaped CaCO3 Covered with Abundant Nanoscale Rhombic Calcite Subunits

“…The adjustment of process parameters can help prepare different morphologies of CaCO 3. The relationship between process and morphology was established. − Mechanism analysis only involves the transport of Ca 2+ and CO 3 2– , which is prone to the analysis of macroscopic forces. However, the interactions between pre-nucleated clusters, primary nanoparticles, or other intermediate states are chiefly controlled by microscopic forces, which can significantly affect crystal morphology and structure .…”

Ultrasonic-assisted production of precipitated calcium carbonate particles from desulfurization gypsum

“…Recently, several studies have evaluated the effect of ultrasonic treatment in the production of different materials with extraordinary properties [23] , [24] , [25] , [26] , [27] , [28] , [29] , [30] , [31] . Conducting ultrasonic irradiation accelerated the carbonation mechanism resulting in a faster production of PCC particles was determined [23] , [24] , [30] , [31] . During production, formed PCC particles were crushed and the corresponding particle morphology was altered owing to a shaping effect, which led to the formation of spherical particles rather than other crystal shapes [32] .…”