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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.