Abstract: An apparatus for smelting meltable substances, particularly ore concentrates. A transfer element joins the cyclone discharge to the furnace and is arranged between the melting cyclone and the furnace. In this way, the fitting, particularly the re-fitting of an open-hearth furnace with a melting cyclone can be significantly simplified; or, on the other hand, the melting cyclone can be very easily dismantled for the purpose of repair or can be replaced by another melting cyclone in a relatively short time, namely without a significant interruption of furnace operations.