Feed in calcium carbonate, heat it up and sequester the CO2, and use the hot calcium oxide once then ship it off to the cement plant.

Or, how about taking an existing cement plant and have it use the air heat-exchanger/turbine/generator setup described in this project to recover the energy in the red-hot clinker? I assume they'd have some sort of heat exchanger system already to preheat feedstock using the outflow, however?