Experimental study and reaction path modeling of the carbonation of natural serpentinites

Florian Osselin; Michel Pichavant; Arnault Lassin

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arXiv · 2111.02959

Experimental study and reaction path modeling of the carbonation of natural serpentinites

Florian Osselin·Michel Pichavant·Arnault Lassin

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Abstract

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.

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Florian Osselin, Michel Pichavant, Arnault Lassin. 2021-10-27. Experimental study and reaction path modeling of the carbonation of natural serpentinites. https://arxiv.org/abs/2111.02959

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