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- Title
Dunite carbonation in batch-tubular reactor.
- Authors
Agrawal, Amit Kumar; Mehra, Anurag
- Abstract
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.
- Subjects
DUNITE; CARBONATE rocks; MAGNESITE; GEOLOGICAL carbon sequestration; CARBON sequestration; TUBULAR reactors
- Publication
Environmental Science & Pollution Research, 2020, Vol 27, Issue 25, p31439
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-020-09426-4