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A comment on Launch HN: Heimdal (YC S21) – Carbon neutral cement. Parent comment

Re:Launch HN: Heimdal (YC S21) – Carbon neutral cement by robinsoh on Monday August 02, 2021 @08:40PM (#28044494)
I'm probably missing something obvious.

> The world needs CaO for cement. We have a carbon neutral process for making it

vs

> We make synthetic limestone using atmospheric CO2, such that when it is used to make cement, the process is carbon neutral.

Do you make CaO or CaCO3?

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Re:Launch HN: Heimdal (YC S21) – Carbon neutral cement by marcuslima on Tuesday August 03, 2021 @04:30AM (#28046907)
We make CaCO3, I mention CaO here because that's what cement producers ultimately need. They heat up limestone (CaCO3) to make CaO
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Re:Launch HN: Heimdal (YC S21) – Carbon neutral cement by coryrc on Tuesday August 03, 2021 @02:24PM (#28052396)
Is there a reason not to make quicklime instead of limestone?
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