Heat-Induced Dolomitization of Amorphous Calcium Magnesium Carbonate in a CO₂-Filled Closed System.

ABSTRACT: We report a method to synthesize dolomite [CaMg(CO₃)₂] from amorphous calcium magnesium carbonate (ACMC) via solid-state transformation. When ACMC is heated in air, it does not crystallize into dolomite but decomposes into Mg calcite, magnesium oxide, and CO₂. Hence, we heated ACMC in a closed system filled with CO₂ gas (pCO₂ >1.2 bar at 420 °C) and produced submicron-sized dolomite. Single-phase dolomite was obtained after dissolving impurities in the run products, such as northupite [Na₃Mg(CO₃)₂Cl] and eitelite [Na₂Mg(CO₃)₂], in water. Also, we investigated the crystallization process of dolomite by changing the heating temperature and heating time. Despite crystalliza

SUBMITTER: Sugawara S 

PROVIDER: S-EPMC9753508 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature