| Autor: |
Osselin, Florian, Pichavant, Michel, Lassin, Arnault |
| Rok vydání: |
2021 |
| Předmět: |
|
| Druh dokumentu: |
Working Paper |
| Popis: |
Mineralization of carbon dioxide is often seen as an attractive alternative to classical Carbon Capture and Storage (CCS) technologies, allowing the sequestration of \ce{CO2} as a solid mineral with no risk of aquifer contamination or leakage back to the atmosphere. While olivine and pyroxenes are known to easily and quickly react with dissolved \ce{CO2}, fresh peridotites are quite rare and ultramafic rocks usually contain significant amounts of serpentine, which presents a lower reactivity. The purpose of this study was then to analyze the reactivity of two natural rocks: a partially serpentinized lherzolite and a fully altered serpentinite. Results confirm that serpentine is much slower to react and gets altered only if the activity of \ce{CO2} is high enough and if all olivine and pyroxenes have already been consumed. Resulting carbonates are mostly Mg-rich calcite or Mg-depleted dolomite with the occurrence of eitelite (\ce{Na2Mg(CO3)2} in the case of high Na activities. The carbonation of these serpentinite was however associated in some cases with a heavy precipitation of hazardous asbestiform chrysotile, which could be a potential threat for engineered carbonation processes. |
| Databáze: |
arXiv |
| Externí odkaz: |
|
