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Isn't CaO largely produced from naturally occuring CaCO3 though? Where do you get a large supply of CaO to react with your sequestered CO2 from?
by khuey 8y ago
Isn't CaO largely produced from naturally occuring CaCO3 though? Where do you get a large supply of CaO to react with your sequestered CO2 from?
- gnode 8y agoApparently when CO2 is injected into hot underground basalt deposits, it is absorbed. https://en.wikipedia.org/wiki/Carbon_sequestration#Mineral_carbonation https://en.wikipedia.org/wiki/Carbon_sequestration#Mineral_c... (last paragraph of section) So I would guess the reason for producing synthetic CaO from CaCO3 is that extracting natural CaO is uneconomical.
- technicalbard 8y agoCaO generally does not exist in natural stone deposits (no alkaline or alkali earths exist as oxides because they are very reactive). You produce CaO from CaCO3 by calcining and driving off the CO2 (which is emitted to the atmosphere).
- gnode 8y agoMy understanding (someone correct me if I'm wrong) is that virgin CaO is released from volcanic activity, and the aforementioned underground basalt is an igneous rock that has not been exposed to surface atmospheric conditions, and thus contains some amount of unreacted CaO.