Date:

2025-10-16

Title of Paper:

CO2 mineralization characteristics of Ca2+-rich leachate from desulfurization gypsum and the regulation of CaCO3 crystal and morphology

Journal:

Journal of Crystal Growth

Summary:

It is very promising that Ca-rich solid wastes could act as calcium source to convert CO2 from industrials into functional CaCO3 product via aqueous carbonation reaction. Because of the complexity in chemical components and mineral classifications of solid wastes, there is still a big challenge for any one solid waste that how to obtain highly pure CaCO3 with a certain crystal form, size and morphology through regulating mineralization process parameters or using inorganic /organic additives. This work aimed to evaluate the potential for indirect CO2 mineralization of Ca2+-rich leachate from desulfurized gypsum (DG) which was produced from wet limestone-gypsum desulfurization system in a coal-fired power plant. The effects of different parameters on Ca2+ leaching characteristic of gypsum and the CO2 mineralization behavior of Ca2+-rich leachate was investigated in detail, as well as the regulation of three additives and reaction conditions onto crystal form and morphology of CaCO3 products. The results showed that the leaching efficiency of Ca2+ from gypsum could reach up to about 46 % at the optimal leaching parameter. Under the optimal operating carbonation parameters, the mineralization efficiency of desulfurized gypsum reached 22 % and the corresponding mineralization capacity was 56.15 kg∙CO2/t∙DG. The addition of ethylene glycol and sucrose promoted the formation of vaterite, while the creation of pine-like aragonite was more favored in the presence of magnesium chloride.

Co-author:

Yanjie Liu, Yibin Wang, Tianming Yin, Chi Lin, Houzhang Tan, Hariana Hariana

Volume:

667

Page Number:

128273

Translation or Not:

No

Date of Publication:

2025-06-02