Enhancing the rate of ex situ mineral carbonation in dunites via ball milling

Abstract

The investigation of potential options for CO 2 sequestration is of vital importance for alleviating the ongoing climate problem. This paper presents an efficient method for enhancing the ex situ carbonation of dunites. The ball milling process was applied to a dunite from the Troodos ophiolite (Cyprus), in order to create a new type of material with enhanced CO 2 uptake. Through CO 2 chemisorption followed by temperature-programmed desorption (CO 2 -TPD) experiments, optimum ball milling conditions were found (12 h of wet ball milling with 50 wt% ethanol as process control agent), leading to an increase of CO 2 uptake of dunite by a factor of 6.9. A further increase of CO 2 uptake by 10% was accomplished after 4 h of additional ball milling with smaller balls. Additionally, CO 2 -TPD along with in situ DRIFTS studies indicated that the CO 2 uptake of the dunitic materials can be substantially enhanced by the presence of H 2 O during CO 2 chemisorption. The positive effect of H 2 O on CO 2 chemisorption becomes much more evident after the ball milling process. Specifically, the CO 2 uptake of the ball-milled sample (BM45) was enhanced by a factor of 5.8 (from 181.9 to 1047.5 µmol g -1 ), when CO 2 chemisorption was performed in the presence of 20 vol% H 2 O. ABSTRACT FROM AUTHOR]

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