Microwaving Mining Waste to Capture CO2: A Breakthrough in Carbon Removal

A carbon removal startup in Canada is testing microwaves to activate mining waste for CO2 capture. By targeting specific molecules in serpentine-rich rocks, the method requires less energy than traditional heating, making it a sustainable alternative. The treated rocks mineralize CO2 faster, potentially storing billions of tonnes globally.

Arca’s lab tests show microwaved serpentine reacts dramatically faster with CO2, unlocking more magnesium for carbon storage. The process could be integrated into mining operations or used standalone, with autonomous rovers churning tailings to maximize air exposure. This innovation could also aid in extracting nickel, a key battery metal, from the same rocks.

While promising, scaling the technology remains a challenge. Experts caution that real-world results may vary, but the potential for significant CO2 removal is undeniable. If successful, this method could turn mining waste into a powerful tool against climate change.

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