[marcuslima]

Our process produces calcium carbonate, CaCO3, which cement producers can then burn to make quicklime, CaO. This does release CO2 but that CO2 has been captured from the atmosphere in the process of making that calcium carbonate. We only address process emissions (ie. splitting CO2 from CaCO3), but we do also produce hydrogen on-site, which can be used to replace fossil fuels in generating the requisite heat

[froh]

ok so your cement does not expose additional co2 from the lime-to-quicklime transformation, instead it takes co2 from the oceans. that is released to zhe athmosphere during cement production. and that co2 from the air is then recaptured by the ocean. so your process creates a ocean-co2 -> air -> ocean cycle.

and when and where the hydrogen is replacing some carbon based fuels, somehwere, that counterbalances the carbon based fuel used in the cement furnace.

now I get how it becomes carbon neutral overall.

do you guys have data points at hand how long it takes for an ocean to recapture the co2?