Also the power needed to grind clinker down to powder is huge, overall comminution (grinding) industrial processes are among the biggest electricity consumer in

Also the power needed to grind clinker down to powder is huge, overall comminution (grinding) industrial processes are among the biggest electricity consumer in the world. Cement ball mills are less than 1% efficiency. https://en.wikipedia.org/wiki/Cement_mill https://en.wikipedia.org/wiki/Cement_mill Having done two postdocs in the field i can tell its not progressing very fast...