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A comment on Direct conversion of CO2 to solid carbon by Gallium-based liquid metals. Parent comment

Re:Direct conversion of CO2 to solid carbon by Gallium-based... by leifg on Tuesday January 18, 2022 @11:52PM (#29990095)
> Gallium is cheap (~$300/kg)

Please correct me if I get the numbers wrong but if that is the price, that means the price of 1 ton Gallium is $300,000 per ton

From [another comment](https://news.ycombinator.com/item?id=29990056) I got that the ratio of CO2 to Ga would be 1 to 2. So in order to reduce 1 ton of CO2 you'll need to spend $600,000. That seems insane. Especially when the damage done per ton of CO2 is usually valued at ~$200.

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Re:Direct conversion of CO2 to solid carbon by Gallium-based... by gumby on Tuesday January 18, 2022 @11:58PM (#29990135)
The Ga is a catalyst, so it’s a cap ex not op ex.

I’m dubious but open to try anything halfway plausible at this point.

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Re:Direct conversion of CO2 to solid carbon by Gallium-based... by laci37 on Wednesday January 19, 2022 @04:38AM (#29991643)
The abstract says the process produces gallium oxide. We would need to recycle that into gallium, which is probably energy intensive.
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Re:Direct conversion of CO2 to solid carbon by Gallium-based... by spartanatreyu on Wednesday January 19, 2022 @12:00AM (#29990155)
Pretty sure the Gallium can be recycled.
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