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Caution: this has only been tested in kilogram-scale quantities so far. But it's promising enough that scaled-up tests are due within the next weeks. (TLDR: you can use recycled concrete as flux in an electric arc furnace to purify iron ore … and as a by-product get Portland cement, with no fossil carbon requirement.)
https://mstdn.social/@kevinrns/112513625887020005

Kevin Russell (@kevinrns@mstdn.social)

Concrete is 8% of carbon dioxide emissions,. so it is with great pleasure, these researchers announce ZERO carbon emission cement. "A miracle." Proposed Zero-Carbon Cement Solution Called 'Absolute Miracle' " . . .
Mastodon 🐘
in reply to Charlie Stross

Paolo Redaelli
Paolo Redaelli
• •
#Cement made with iron #slag has been widely used since decades. For example type IIIC have 83-95% of slag content. Slag cements yet have a very slow setting time. We'll see if they really get actual #clinker (Portland cement is a mix of clinker, gypsum and usually limestone)
#cement #slag #clinker

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