The CemSol research project aimed to show that a solar-heated calcination unit is technically feasible on an industrial scale and can be operated economically. By using solar thermal energy instead of fossil fuels, large amounts of CO2 emissions can be avoided.

The core of the project focused on investigating how a solar thermal system can supply the high-temperature heat for the calcination of calcium carbonate, an energy-intensive sub-step in cement production. This begins with material investigations in order to assess the carbonization potential of cement raw meal. Based on the study results, the researchers designed a suitable reactor concept for the carbonator and a scale-up concept for the solar calciner. Their operation was then demonstrated and their efficiency determined. Important criteria were high-temperature stability, thermal shock resistance, efficient operation, and product quality. Once this was ready, the focus went towards researching to what extent the technology can be used for other industries with high CO2 emissions. A techno-economic study provided indications for the industrial scale use of such a technology in reference processes such as amine scrubbing and oxyfuel processes.