Method for rapid mineralization of CO2 with carbide slag in the constant-pressure and continuous-feed way and its reaction heat

Grouting filling materials into a goaf is a necessary step for goaf disaster prevention and control. This study is aimed at developing a process and method of rapid and low-cost CO2 mineralization with alkaline waste. The effects of various factors, including stirring speed, pressure, solid-liquid ratio and slurry entry speed, on mineralization degree and reaction heat extraction during the mineralization process in the constant-pressure and continuous-feed way were investigated through experiments and numerical simulations. Besides, costs in the whole mineralization process were analyzed. The following conclusions were drawn: The mineralization degree exceeds 80% in the constant-pressure and continuous-feed way, and the CO2 sequestration capacity of carbide slag reaches 0.47 g/g. In addition, the equation of the cost of CO2 emission reduction was established. This study offers a novel and low-cost carbon capture, utilization and storage (CCUS) technology route that can accelerate the realization of peak CO2 emissions and carbon neutrality.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

This study aims to develop a rapid and low-cost process of CO2 mineralization using alkaline waste. The effects of various factors on mineralization degree and reaction heat extraction were investigated through experiments and numerical simulations. The study also analyzed the costs in the whole mineralization process. The results showed that the mineralization degree exceeded 80% and the CO2 sequestration capacity of carbide slag reached 0.47 g/g in the constant-pressure and continuous-feed way. Additionally, the study established the equation of the cost of CO2 emission reduction. This study offers a novel and low-cost carbon capture, utilization and storage (CCUS) technology route that can accelerate the realization of peak CO2 emissions and carbon neutrality.