Based on the tremendous amount of metal waste consisting of cast iron and steel in Kosovo and in the process smelting them into the
furnace cupola in order to obtain the liquid coast iron, and that this process has been shown successful in economic and industrial terms, is a need for examining the possibility of decarbonization of the liquid cast iron produced in the cupola furnace, with auxiliary furnace application bulge pure oxygen in molten cast iron (Eric, 2009).