Preparation of needle-like aragonite particles from calcium nitrate solution in batch and flow reactors

Needle-like aragonite particles for application in paper industry were synthesised from calcium nitrate solution. Calcium nitrate was prepared from waste lime. Samples of precipitated aragonite were prepared both in batch and flow reactors, respectively. Conditions (concentration of calcium nitrate, temperature, and flow rate of CO₂) were optimized for achieving high yield of aragonite in the product.