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A few days ago I went deep on cement again, using an assessment of the processes of American clean cement startups to define the scope and magnitude of the problem, the chemistry and energy requirements of cement, why fixing it is critically important, and incidentally evaluate a couple of companies’ offerings.
The CliffsNotes — FreeBookNotes in China is the closest approximation — of that deep dive is pretty straightforward. Limestone is incredibly cheap and widely spread because it’s dead shellfish and precipitated calcium ions from long vanished oceans. Deposits hundreds of square kilometers and a hundred or more meters deep are near or on the surface all over continents globally.
We quarry limestone cheaply because it’s a softer, sedimentary rock and exists almost everywhere…
Read the full article originally published at cleantechnica.com.