Carbon capture and utilization: Preliminary life cycle CO2, energy, and cost results of potential mineral carbonation

Abstract

Abstract Mineral carbonation has been identified as a potentially suitable means of CO 2 sequestration in Singapore due to the nation’s lack of land for geological or deep ocean storage of CO 2 . In this article, the total energy, CO 2 emissions and costs of mineral carbonation are investigated using a life cycle assessment (LCA) approach. The life cycle investigation took into account energy and greenhouse gas emissions from mineral mining activities and shipment, the recovery of CO 2 based on amine scrubbing technology and simulated scenarios of the net energy requirements for the carbonation process based on ‘ideal’ and worst case energy requirements. The CO 2 avoided results from a total o f 4 scenarios were in the range of 106.9 kg to 175.9 kg per 1 MWh. The percentage sequestration effectiveness results are from 32.9% to 49.7%. The life cycle costing results are 105.6 USD/tonne CO 2 avoided and 127.2 USD/tonne CO 2 avoided for two of the most favorable scenarios. However, it is highlighted that various engineering challenges have to be overcome before the ‘ideal’ carbonation reaction conditions represented in the simulation model can be achieved. The results will most likely fluctuate somewhere between the ideal and worst case conditions. The main energy penalties and associated CO 2 emissions come mostly from CO 2 recovery, pre-treatment and mineralization process itself.