Cement is so c02 intensive largely because the chemical reaction which occurs release a large amount of c02. From what I remember the energy use for the furnace is 10% compared to 90% from the fundamental chemistry.
This is what I remember from working for a start up that was helping make low carbon cement, the numbers could be wrong, but it's more complicated than just the energy to reach the high temps.
This is what I remember from working for a start up that was helping make low carbon cement, the numbers could be wrong, but it's more complicated than just the energy to reach the high temps.