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  Scopus ID: 21100926589

Effect of CO2-rich Atmosphere on the Thermal Decomposition of Natural Limestone Destined to Cement Production

Youssef El Hafiane, Yassine El Khessaimi, Agnès Smith, Xavier Guillot and Rémi Barbarulo

Abstract

Cement production is a major contributor to global carbon dioxide (CO2) emissions, accounting for approximately 7% of anthropogenic CO2 emissions worldwide. The vast majority of these emissions arise from the calcination of limestone, a key component of the cement production process. During calcination, limestone is heated to high temperatures, causing it to decompose into calcium oxide (CaO) and CO2. Roughly two-thirds of the CO2 emissions during cement production arise from this process, which releases large amounts of CO2 into the atmosphere. One way to mitigate the CO2 footprint of cement production is through the capture and utilization of CO2 emissions during the calcination of limestone. By capturing CO2 during the decomposition of limestone, cement producers can reduce their overall emissions and contribute to global efforts to combat climate change. However, the effectiveness of this approach depends on a number of factors, including the partial pressure of CO2 during the calcination process. In recent years, a new technology has emerged for the separate calcination of limestone, which involves calcining limestone in a CO2-rich atmosphere. This approach helps to avoid the dilution of CO2 by combustion flue gas, enabling more efficient capture and utilization of CO2 emissions. However, the use of a CO2-rich atmosphere may also have an impact on the thermal decomposition of limestone, affecting the energy balance of the process. The aim of this paper is to investigate the influence of CO2 partial pressure on the thermal decomposition of natural limestone used in cement production. A series of experiments were conducted to measure the thermal decomposition of limestone at different CO2 partial pressures, and thermodynamic calculations were used to model the behaviour of the system. The results showed that CO2 shifts the onset decomposition temperature of limestone to higher values, which can have a significant impact on the energy balance of the separate calcination technology.

Published on: September 28, 2023
doi: 10.17756/nwj.2023-s2-053
Citation: El Hafiane Y, El Khessaimi Y, Smith A, Guillot X, Barbarulo R. 2023. Effect of CO2-rich Atmosphere on the Thermal Decomposition of Natural Limestone Destined to Cement Production. NanoWorld J 9(S2): S311-S314.

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