Eco-friendly Process for Production of Precipitated Calcium Carbonate from Calcium Carbonate Rich by-product.

An environmentally friendly process for the production of precipitated calcium carbonate.

CSIR-CSMCRI has developed eco-friendly process to produce precipitated calcium carbonate from calcium carbonate rich by-product generated in a chemical processing industry. This process significantly purifies the calcium carbonate rich by-product in continuous process.

• Using a raw material without pre-drying or crushing.
• Keeping the material in free-flowing conditions throughout the processing.
• Removal of the chemical impurities during calcination.
• Improving brightness without using any special reagent.
• Calcination of very fine (from 20 to 150 micron) and highly dense (bulk density 1.3 to 1.35 g/mL) particles with minimum dusting.
• Avoiding the requirement of special types of material for construction of the calciner by limiting the calcination temperature to below 1000° C.
• Limiting the effect of calcination to removal of impurities without forming the dead burnt lime.
• Means for scrubbing liberated gases to avoid pollution of the surrounding environment.