A CO2 capture solvent with exceptionally low total costs of capture

Re:A CO2 capture solvent with exceptionally low total costs ... by DennisP on Sunday April 04, 2021 @07:03AM (#26688439)

One great idea for storage is underground basalt formations. Inject CO2, and it'll turn into limestone in under two years. It can't solve the whole problem by itself, but there's enough capacity for gigatons of CO2.

There are several entities working on this. Here's a company with a small pilot project, and links to scientific papers: https://www.carbfix.com/

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Re:A CO2 capture solvent with exceptionally low total costs ... by throwaway316943 on Sunday April 04, 2021 @07:20AM (#26688540)

I believe basalt can be produced artificially as well, is there a chance we could build limestone farms? That would be a neat trick.

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Re:A CO2 capture solvent with exceptionally low total costs ... by corty on Sunday April 04, 2021 @02:15PM (#26691610)

Artificial production alone doesn't do the trick. It would have to be low in energy consumption, preferably exothermic. I don't think there is such a reaction with plentifully available material. Otherwise you spend more energy on the basalt than the CO_2 production gave you.

Also, large parts of this planet consist of natural basalt deposits, every area with some current or historic vulcanism has them. E.g. half of Siberia is a huge basalt deposit. Google Siberian Trap. So I do not think artificial production would be necessary.

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