For geological carbon sequestration, the reaction of aqueous CO2 with silicate rock permits carbonate formation, achieving permanent carbon sequestration. The fractures available in silicate rock provide significant surface area for the precipitation of carbonates. The experiments were performed in a batch tubular reactor under diffusion-limited condition, with a special arrangement of a narrow tube filled with a 2800 g/L dunite slurry. The tube was kept open from the top, standing vertically filled with a CO2-rich bulk solution under 1 barg CO2 and temperatures ranging from 25 to 75 oC for 7–30 days. After 7 days of the experiment, magnesite precipitation was seen inside the tube and the precipitation was continued for up to 30 days. The magnesite precipitation was identified by micro-Raman spectroscopy, X-ray diffraction, and scanning electron microscopy. Additionally, SiO2 formation was seen in relative close vicinity to the magnesite precipitation. The precipitation on the surface of silicate rock might cover the fractures and pore spaces available, which may over time reduce the dissolution rate of dunite.
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In principle, monovalent (Na) cations would also work, though the much higher solubility of their carbonates makes them less practical
Close system in gas and other chemicals cannot escape to the atmosphere Where the gas can escape to the atmosphere
Ideally for olivine, the molecular composition of Mg and Fe should add up to 2, as in the ratio between two-valent cations and Si of 2 (or be slightly less if their are some minor impurities not listed).
In other silicates that ratio is either equal or lower than 2.
My best guess is that there is Mg and/or Fe present that is not in the form of a silicate (possibly oxide or hydroxide). Could you try to expand on aspect?
I am also not sure how the elemental composition in Table 1 can be related to the molecular formula.
Reason of the high ratio has been postulated It may be because of possible presence of Fe in the form of oxide or hydroxide. However the hypothesis cannot be verified at this stage as the experimental sample has been discarded.
Concentrated slurry means fixed bed of solid particles saturated with water.
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Agrawal, A.K., Mehra, A. Dunite carbonation in batch-tubular reactor. Environ Sci Pollut Res (2020). https://doi.org/10.1007/s11356-020-09426-4
- CO2 pressure
- Dunite rock
- Batch-Tubular reactor