For the purpose of natural resource conservation and in the interest of preventive environmental protection, more and more secondary raw materials and substitute fuels are used in the production of cement clinker. Despite a previous sorting process, these substances contain a significant content of problematic metallic impurities. The effectiveness of the pyrolysis of these substances depends greatly on the operation site, temperature and time of operation in the clinker burning process. Finally, as a result of the present master thesis, several important findings were gained on the depletion of these metallic pollutions from the cement clinker.