Carbon savings achieved by mineralising CO<SUB align="right">2 into precipitated calcium carbonate: calculation on a pilot project in a thermal power plant

Mineralisation is among the most successful CCUS technologies, carbonising CO2 into CaCO3 permanently. A pilot project at a thermal plant produces carbon-negative precipitated calcium carbonate, requiring 1.05 tonnes of carbide slag, 0.06 tonnes of NH4Cl, 242.5 kWh of energy, 0.2 tonnes of water, 4.27 Nm3 of air, and 0.44 tonnes of CO2 for each tonne of product. Carbon footprint calculated by the emission factor technique is -0.2199 t CO2/t CaCO3 (slurry application) and -0.1219 t CO2/t CaCO3 (dry powder application). Primary carbon emission is from energy-consuming media, with green energy expected to reduce carbon emissions significantly.