XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 3507
CONCLUSION AND SUMMARY
This study shows the significant role of inorganic electro-
lyte in enhancing the carbonation efficiency of olivine for
CO2 sequestration. Sodium metasilicate (Na2SiO3) and
ammonium chloride (NH4Cl) showed modest enhance-
ments, while potassium chloride (KCl), ammonium sul-
fate ((NH4)2SO4), and especially sodium sulfate (Na2SO4)
exhibited significant improvements on kinetics of car-
bonation. SEM analyses provided insightful observations
into the impact of Na2SO on the carbonation efficiency.
The formation of magnesite crystals, as seen in the SEM
images, Occurred away from the olivine surface, forming
clusters linked by amorphous silica, differing from the base-
line condition. This suggests a difference in crystal growth
and silicic acid diffusion with the addition of Na2SO4. In
contrast, baseline conditions revealed magnesite and amor-
phous silica forming a barrier around unreacted silicate
minerals, potentially inhibiting further carbonate forma-
tion. The present study highlights the potential of using
sodium sulfate (Na2SO4) as an effective additive in the
mineral carbonation process, providing an alternative to
enhancing CO2 uptake rates and the overall efficiency of
the sequestration process.
ACKNOWLEDGMENT
The authors would like to acknowledge the financial sup-
port from the Department of Energy—Advanced Research
Projects Agency—Energy (DOE ARPA-E) under the award
number (DE-AR0001702).
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