Preparation of nano-sized calcium carbonate in solution mixing process

Discreet nano-sized precipitated calcium carbonate was prepared by a simple solution mixing process, in which sodium carbonate solution was injected into calcium chloride solution containing calcium hydroxide. The morphology, size, and structure of the as-prepared precipitated calcium carbonate and intermediate products were examined. The results indicated that the non-impurity additive of calcium hydroxide, temperature below 30 °C, and controlled injecting rate were essential to obtain nano-sized precipitated calcium carbonate in the solution mixing process. It was observed that the intermediate nanofibrils fragged into nanograins in the process. This method can provide a simpler method to study the formation mechanism of nano calcium carbonate.