Method and arrangement for refining copper concentrate

A method for refining copper concentrate, wherein the method comprises

• using a suspension smelting furnace comprising a reaction shaft, and a settler, wherein the reaction shaft of the suspension smelting furnace is provided with a concentrate burner for feeding copper concentrate and additionally at least reaction gas into the reaction shaft of the suspension smelting furnace to obtain a blister layer containing blister and a first slag layer containing slag on top of the blister layer in the settler of the suspension smelting furnace, and
• using a slag cleaning furnace, and
• feeding copper concentrate and additionally at least reaction gas into the reaction shaft of the suspension smelting furnace to obtain a blister layer containing blister and a first slag layer containing slag on top of the blister layer in the settler of the suspension smelting furnace,
• and wherein the method comprises
• feeding slag from the first slag layer in the settler of the suspension smelting furnace and blister from the blister layer in the settler of the suspension smelting furnace from the suspension smelting furnace into the slag cleaning furnace,
• treating blister and slag in the slag cleaning furnace with a reduction agent to obtain a bottom metal layer containing bottom metal copper and a second slag layer containing slag on top of the bottom metal layer in the slag cleaning furnace,
• discharging bottom metal copper from the bottom metal layer in the slag cleaning furnace, and
• discharging slag from the second slag layer in the slag cleaning furnace.