Effect of pCO 2 on direct flue gas mineral carbonation at pilot scale

Abstract

Concerns about global warming phenomena induced the development of research about the control of anthropogenic greenhouse gases emissions. The current work studies on the scaling up of aqueous mineral carbonation route to reduce the CO emissions at the chimney of industrial emitters. The reactivity of serpentinite in a stirred tank reactor was studied for several partial pressures of CO (pCO) (0.4, 0.7, 1.3 and 1.6 bar). Prior to carbonation, the feedstock was finely grinded and dehydroxyled at 650 °C by a thermal treatment. The major content of magnetite was removed (7.5 wt% · total weight). Experiments were carried out under batch mode at room temperature using real cement plant flue gas (14-18 vol% CO) and open pit drainage water. The effect of the raw water and the pCO on the carbonation efficiency was measured. First, the main results showed a positive effect of the quarry water as a slight enhancement of the Mg leaching in comparison with distilled water. Secondly, a pCO of 1.3 bar was the optimal working pressure which provided the highest efficiency of the carbonation reaction (0.8 gCO · g residue). Precipitation rates of dissolved CO ranged from 7% to 33%. Pure precipitate was obtained and essentially composed of Nesquehonite. At a pCO of 1.3 bar, additional physical retreatment of the solid material after being contacted with 6 batches of gas enhanced considerably mineral carbonation efficiency (0.17 gCO · g residue.).

Rock ‘n’ use of CO2: carbon footprint of carbon capture and utilization by mineralization

“…The CSTR pathways have been improved using various additives, pretreatments, and reactor conditions (pressure, temperature, reaction time, stirring speed). 13,[52][53][54][55] For CSTR pathways using serpentine as feedstock, we consider the pathway based on O'Connor et al 13 using pure CO 2 at 115 bar (CSTR 115 bar serpentine) and the pathway based on Kemache et al 22 using directly off-gas that is compressed to 10 bar for the mineralization (CSTR 10 bar serpentine). For olivine as feedstock, we consider the pathway based on O'Connor et al 13 using pure CO 2 at 150 bar (CSTR 150 bar olivine) and the pathway based on Eikeland et al 53 using pure CO 2 at 100 bar (CSTR 100 bar olivine).…”

Integrated Mineral Carbonation of Ultramafic Mine Deposits—A Review

“…The CO 2 sequestration efficiency was enhanced to 0.28 g CO 2 /g residue after carbonation for 15 min at the optimum condition (T = 22 • C, P CO 2 = 0.19 MPa, P CO 2 :P H 2 O = 1.8) [101]. Kemache et al [115,116] tested the direct aqueous carbonation process at pilot scale. Although they obtained a low process efficiency compared to that in the laboratory, it was a meaningful step for mineral carbonation research under real conditions.…”

CO2 Sequestration by Mineral Carbonation: A Review

“…In this method, mineral oxides interact with gaseous CO2 at a particular pressure and temperature (Lackner et al, 1997;O'Connor et al, 2005). The dry carbonation method also produces high-temperature steam which can be utilized to produce electricity (Mouedhen et al, 2017;Sanna et al, 2014a). Mining activities can be integrated with carbonation process which may be beneficial to control costs and energy requirements, probably allowing for higher minerals extraction rates and purity.…”