|Cite this article as:|
|Qianqian Wang, Zequn Yao, Lijie Guo, and Xiaodong Shen, Exploring the potential of olivine-containing copper-nickel slag for carbon dioxide mineralization in cementitious materials, Int. J. Miner. Metall. Mater.,(2023). https://doi.org/10.1007/s12613-023-2743-1|
Water-quenched copper-nickel metallurgical slag, enriched with olivine minerals, exhibits promising potential for the production of CO2 mineralization cementitious materials. In this work, we synthesized copper-nickel slag-based cementitious material (CNCM) by using different chemical activation methods to enhance its hydration reactivity and CO2 mineralization capacity. Different water curing ages and carbonation conditions are explored with the examination of the mechanical properties and microstructure development of carbonated CNCM blocks. Meanwhile, thermogravimetry-differential scanning calorimetry and X-ray diffraction methods are used to evaluate the CO2 adsorption amount and carbonation products of CNCM. Results show that the 3 d water-cured CNCM exhibited the highest CO2 sequestration amount of 8.51 wt.% at 80 ℃ and 72 h while achieving a compressive strength of 39.07 MPa among the studied samples. This means that one ton of this CNCM can sequester 85.1 kg of CO2 as well with high compressive strength. The addition of citric acid does not improve the strength development but is beneficial to increase the CO2 diffusion and adsorption amount at the same carbonation condition. This work provided a possible solution for This work could be guidance for synthesizing CO2 mineralization cementitious materials with large usage of metallurgical slags containing olivine minerals.