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A comment on Adding Crushed Rock to Farmland Pulls Carbon Out of the Air. Parent comment

Re:Adding Crushed Rock to Farmland Pulls Carbon Out of the Air by s0rce on Wednesday October 25, 2023 @04:54PM (#38018247)
Seems like US average is 0.855 pounds of CO2 emissions per kWh so this process looks like a significant win. Also grinding a ton of rocks doesn't use much energy if its just 14 kwh...

https://www.eia.gov/tools/faqs/faq.php?id=74&t=11

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Re:Adding Crushed Rock to Farmland Pulls Carbon Out of the Air by bagels on Wednesday October 25, 2023 @05:21PM (#38018559)
Hard to follow all the units, but, just for grinding, using these numbers:

grinding: ~14 kWh/tonne olivine

absorption: 1.25 tonne of CO2 per tonne of olivine

emissions: 0.855 lbs CO2 / kWh

emissions: 5.4 kg CO2 per 1.25 tonne CO2 (1250 kg) absorbed

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Re:Adding Crushed Rock to Farmland Pulls Carbon Out of the Air by pfdietz on Wednesday October 25, 2023 @10:27PM (#38020979)
> emissions: 0.855 lbs CO2 / kWh

Why do there have to be CO2 emissions?

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Re:Adding Crushed Rock to Farmland Pulls Carbon Out of the Air by oldbbsnickname on Thursday October 26, 2023 @01:24AM (#38021912)
There don't. The problem is a lack of remote industrial equipment that are EVs powered by renewable electricity sources rather than diesel fuel.
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Re:Adding Crushed Rock to Farmland Pulls Carbon Out of the Air by defrost on Thursday October 26, 2023 @01:36AM (#38022004)
That's not really that much of a problem to be honest.

If this is to be an industrial mining scale operation that goes in with a 600 million tonne per annum target (similar scale to iron ore for steel mining operations) then the company building out the capital assets will setup EV's and solar on the grounds of both economy and PR.

You can see this with Rio Tinto Iron, Fortescue Metals, etc.

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Re:Adding Crushed Rock to Farmland Pulls Carbon Out of the Air by bagels on Thursday October 26, 2023 @05:01AM (#38023350)
You could solar power it, or whatnot. I was just trying to contextualize the numbers others had written.
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