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Ambient weathering of magnesium oxide for CO2 removal from air
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Journal Article
Ambient weathering of magnesium oxide for CO2 removal from air
2020
Overview
To avoid dangerous climate change, new technologies must remove billions of tonnes of CO
2
from the atmosphere every year by mid-century. Here we detail a land-based enhanced weathering cycle utilizing magnesite (MgCO
3
) feedstock to repeatedly capture CO
2
from the atmosphere. In this process, MgCO
3
is calcined, producing caustic magnesia (MgO) and high-purity CO
2
. This MgO is spread over land to carbonate for a year by reacting with atmospheric CO
2
. The carbonate minerals are then recollected and re-calcined. The reproduced MgO is spread over land to carbonate again. We show this process could cost approximately $46–159 tCO
2
−1
net removed from the atmosphere, considering grid and solar electricity without post-processing costs. This technology may achieve lower costs than projections for more extensively engineered Direct Air Capture methods. It has the scalable potential to remove at least 2–3 GtCO
2
year
−1
, and may make a meaningful contribution to mitigating climate change.
To remove CO
2
from the atmosphere every year by mid-century will need new technologies. Here the authors proposed the use of magnesia (MgO) in ambient looping processes to remove CO
2
from the air and they found that the proposed approach will cost $46–195 tCO
2
−1
net removed from the atmosphere considering both grid and solar electricity resources without including post-processing costs.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
