Azadeh Hemmati, Jalal Shayegan
Carbon dioxide sequestration by a pH-swing carbonation process was considered in this work. A multi-step aqueous process is described for the fractional precipitation of magnesium carbonate and other minerals in an aqueous system at room temperature and atmospheric pressure. With the aim to achieve higher purity and deliver more valuable mineral products, the process was split into four steps. The first step consists of Mg leaching from the magnesium silicate in a stirred vessel using 1 M HCl at 80 °C, followed by a three step precipitation in reactors in sequence to remove Fe(OH)3, then Fe(OH)2 and other divalent ions, and finally MgCO3 nucleation and growth. Hydrated magnesium carbonate [MgCO3·3H2O, nesquehonite] crystals were confirmed using X-ray diffraction (XRD) as final products. The optimal pH of precipitation reactors based on the maximum solid purity and production were determined by carrying out detailed mass balance. The maximum productivity and highest purity were achieved under specific conditions.
@article{58362b68-b0eb-4f5e-a312-065dc7fe968d,
title={Process optimization for mineral carbona},
author={Azadeh Hemmati and Jalal Shayegan},
year={2026},
language={en}
}TY - JOUR TI - Process optimization for mineral carbona AU - Azadeh Hemmati AU - Jalal Shayegan PY - 2026 LA - en ER -
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