A method for refining sulfidic copper concentrate, wherein the method comprising feeding sulfidic copper concentrate and oxygen-bearing reaction gas and slag forming material into a reaction shaft of a suspension smelting furnace by means of a burner that is arranged on top of the reaction shaft of the suspension smelting furnace, whereby sulfidic copper concentrate and oxygen-bearing reaction gas and slag forming material react in the reaction shaft of the suspension smelting furnace into blister copper and slag, collecting slag and blister copper in a settler of the suspension smelting furnace to in the settler of the suspension smelting furnace form a blister layer containing blister copper and a slag layer containing slag on top of the blister layer, and discharging slag in unreduced state and blister copper separately from the settler of the suspension smelting furnace, so that slag in unreduced state is fed into an electric furnace, characterized by feeding a part of the sulfidic copper concentrate into the electric furnace, by reducing the slag, that is fed in unreduced state from the suspension smelting furnace, in the electric furnace at least partly with the sulfidic copper concentrate that is fed into the electric furnace to in the electric furnace form a matte layer containing copper matte and an electric furnace slag layer containing electric furnace slag on top of the matte layer, by discharging electric furnace slag and matte copper separately from the electric furnace, by granulating and treating the copper matte that is discharged from the electric furnace to obtain copper matte feed material, and by feeding at least a part of said copper matte feed material into the reaction shaft of the suspension smelting furnace by means of the burner. feeding sulfidic copper concentrate and oxygen-bearing reaction gas and slag forming material into a reaction shaft of a suspension smelting furnace by means of a burner that is arranged on top of the reaction shaft of the suspension smelting furnace, whereby sulfidic copper concentrate and oxygen-bearing reaction gas and slag forming material react in the reaction shaft of the suspension smelting furnace into blister copper and slag, collecting slag and blister copper in a settler of the suspension smelting furnace to in the settler of the suspension smelting furnace form a blister layer containing blister copper and a slag layer containing slag on top of the blister layer, and discharging slag in unreduced state and blister copper separately from the settler of the suspension smelting furnace, so that slag in unreduced state is fed into an electric furnace, characterized by feeding a part of the sulfidic copper concentrate into the electric furnace, by reducing the slag, that is fed in unreduced state from the suspension smelting furnace, in the electric furnace at least partly with the sulfidic copper concentrate that is fed into the electric furnace to in the electric furnace form a matte layer containing copper matte and an electric furnace slag layer containing electric furnace slag on top of the matte layer, by discharging electric furnace slag and matte copper separately from the electric furnace, by granulating and treating the copper matte that is discharged from the electric furnace to obtain copper matte feed material, and by feeding at least a part of said copper matte feed material into the reaction shaft of the suspension smelting furnace by means of the burner.