Enhancement of CO2 Mineralization in Ca2+-/Mg2+-Rich Aqueous Solutions Using Insoluble Amine

The potential for using concentrated seawater to fix CO 2 by adding insoluble amine extractant was tested and verified. The experimental results showed that over 90% of Ca 2+ ions could be converted to precipitation. Ammonia was chosen as regenerant to regenerate the extracting agent; the regeneration rate can reach 95%. On the basis of the analysis of MgCO 3 precipitation properties, a new CO 2 mineralization process was proposed in which CaO is employed to react with Mg 2+ in solution. Mg(OH) 2 precipitation and Ca 2+ -rich aqueous solutions were produced, and both performed well in CO 2 mineralization. This new process can produce different kinds of byproducts such as MgCO 3, CaCO 3, and NH 4 Cl. Since there is no energy consumption from phase separation, nor is there a heat requirement, it is therefore definitely less energy intensive. This approach has great application potential.