The Romanian economic and energy situation requires a large-scale implementation of clean and efficient technologies for the utilization of different residues and wastes from industry. The need for such technologies has become even more acute, since January 1998 when new environmental regulations became law. This is why our research is focused on the clean combustion of industrial wastes, sludge and biomass. The research work initiated aims to establish a circulating fluidized bed (CFB) combustion and desulfurisation technology for these wastes. In the current paper, the results obtained for two types of residues are presented: a solid waste from the production of electrodes for metallurgic furnaces, and the high-sulfur petroleum coke, that is a residue from oil cracking.