Robotic 'trees' can turn CO2 into concrete

Re:Robotic 'trees' can turn CO2 into concrete by innocentfelon on Tuesday September 11, 2018 @10:25AM (#17959975)

I read it again, twice. That is exactly what they’re doing.

Their starting material is CO2-source cement, not some natural “rock”.

Counterexamples are substantially more helpful than downvotes.

[ Parent | on HN ]

Re:Robotic 'trees' can turn CO2 into concrete by raverbashing on Tuesday September 11, 2018 @10:56AM (#17960270)

It seems they're not replacing the quicklime, but the gravel. The left column is confusing, the right column is better.

> A rock particle is coated with our synthetic limestone, forming a carbon-sequestering coating that is 44% by mass CO2.

That's where the CO2 goes, not in curing the CaO

[ Parent | on HN ]

Re:Robotic 'trees' can turn CO2 into concrete by 08-15 on Tuesday September 11, 2018 @12:08PM (#17960990)

But where does the Ca come from? Obviously not from limestone...

[ Parent | on HN ]