Copper in the molten state is a rather reactive metal, and it interacts with the refractory lining of the furnaces, but the copper slags and copper matter are much more reactive. The processes in primary metallurgy of copper (purification of copper matte to blister copper) and secondary metallurgy of copper (re-melting of cathode copper and alloying) differ. The processes in primary metallurgy of copper have big differences, as a consequence, the types of furnaces in primary copper metallurgy have considerable peculiarities. However, in reverberatory, flash, electric furnaces and convertors the refractories are more or less similar. In re-melting furnaces, there are principally other silicon carbide-based refractories. A short description of the most common refractories, used in the furnaces and runners, corrosion behavior of refractories in contact with the molten slag and molten copper, corrosion resistance and corrosion tests, are made. There are some words about the service lifetime of the furnaces and repairs with a respect to corrosion testing and structure of refractories, and the possibilities of improving the service lifetime on refractories in the furnaces.