An integrated approach to establishing a waste-to-resource supply chain within an industrial park was developed for CO2 fixation, wastewater neutralization and product utilization using high-gravity carbonation (HiGCarb) process. Several alkaline wastes, such as steel slag, bottom ash and byproduct lime, were gathered for performance evaluation operated under various levels of temperature, rotating speed, slurry flow rate and liquid-to-solid ratio. A high CO2 capture efficiency (&gt;95%) can be achieved via the HiGCarb process with a relatively short reaction time at ambient temperature and pressure. These alkaline wastes were found to be successfully carbonated with CO2 in the high-gravity carbonation process, where calcite (CaCO3) was identified as the main product. In addition, the results indicated that the rates of metal ion leaching from the alkaline solid wastes can be prohibited by the high-gravity carbonation process. Moreover, blended cements containing 5%, 10% and 20% replacements of ordinary Portland cement with carbonated solid wastes were tested for compressive strength development and autoclave soundness. The mortars were casted and then tested at different periods, i.e., 3, 7 and 28 days. Since the carbonated product can be used as supplementary cementitious materials, CO2 emissions from the cement industry can be avoided if a green waste-to-resource supply chain between the petrochemical and cement industries is established. It suggests that an integrated approach to the proper treatment of alkaline wastes that permanently fixes CO2 from industries while producing valuable supplementary cementitious materials for the cement industry can be achieved via the HiGCarb process.

CO2 Mineralization and utilization by high-gravity carbonation process: Past, present and future

253rd National Meeting (2017)

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