On Oct 4, 3:49 pm, "David B. Benson" <[EMAIL PROTECTED]> wrote:
> On Oct 4, 2:27 pm, "Don Libby" <[EMAIL PROTECTED]> wrote:
>
> >... - but I'm not sure if just grinding
> > it up and dumping on the ground would be more cost effective.
>
> The paper claims an eventual price of only $14 per tonne of CO2.
> That's unbeatably6 low, it seems to me. [The starting price seems to
> be about $38 per tonne of CO2, about the same (on the high side) as
> turning wood into biochar and burying the biochar deep undeerground.
Unbeatable you say? Calera is trying to turn CO2 + seawater into a
carbonaceous cement that can be sold at a competitive price for
construction projects in place of traditional cement. Assumming that
concentrated high temperature CO2 is available for free (from power
plant exhaust), the company's goal is to have a negative cost per
tonne sequestered. In other words, they want to earn a profit by
selling a product formed by sequestering CO2.
It's a little early to know whether they will actually succeed, but
they certainly have an interesting proposal.
http://www.sciam.com/article.cfm?id=cement-from-carbon-dioxide
http://venturebeat.com/2007/10/05/calera-pulls-carbon-dioxide-out-of-atmosphere-to-produce-cement/
-Robert Rohde
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