Section 04 · 4 pages
Unsolved
Where the carbon is in the rock, not the fire.
Every page in this section
- The carbon is in the rock, not the fireCement releases carbon dioxide from the limestone itself during calcination, so a clean fuel does not fix it.
- Clinker, and what can replace itCutting the clinker fraction is the one lever that works today, and its limits are set by what the concrete has to do afterwards.
- Reducing iron with hydrogenIron ore has always been reduced with carbon; doing it with hydrogen changes the furnace, the feedstock and the entire plant around it.
- The electric arc routeMelting scrap in an arc furnace is the low-carbon route that already exists, and it is limited by how much scrap there is.