Title: Carbon savings achieved by mineralising CO₂ into precipitated calcium carbonate: calculation on a pilot project in a thermal power plant

Authors: Jingqi Tian; Mengqian Zhang; Zhiguo Sun; Chunhong Ding; Jing Ma; Lihong Cai

Addresses: National Energy Group Hainan Electric Power Co., Ltd., Hainan, 570000, China ' Yuanchu Technology (Beijing) Co., Ltd., Beijing, 100015, China ' Guodian Datong Power Generation Co., Ltd., Shanxi, 037000, China ' Yuanchu Technology (Beijing) Co., Ltd., Beijing, 100015, China ' Guodian Datong Power Generation Co., Ltd., Shanxi, 037000, China ' Yuanchu Technology (Beijing) Co., Ltd., Department of Chemical Engineering, Tsinghua University, Beijing, 100015, China

Abstract: 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.

Keywords: CCUS; mineralisation; CaCO₃; carbon emission; emission reduction.

DOI: 10.1504/IJGW.2025.146266

International Journal of Global Warming, 2025 Vol.36 No.2, pp.134 - 148

Received: 18 Oct 2024
Accepted: 21 Dec 2024
Published online: 14 May 2025 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article