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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 brilee on Monday August 02, 2021 @02:21PM (#28040595)
A followup question... how do you regenerate the alkaline sorbent? It gets acidified in the process of extracting CaO from the water and needs to be made alkaline again somehow.
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Re:Launch HN: Heimdal (YC S21) – Carbon neutral cement by twic on Monday August 02, 2021 @04:21PM (#28042113)
He mentions producing hydrogen as another product, so I would guess they use electricity to turn protons into hydrogen gas, so removing acidity.
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