Operation method of copper smelting furnace

An operation method of a copper-smelting furnace comprising:

• mixing an Fe metal source and a feeding material including copper concentrate and a flux, after the mixing, supplying the Fe metal source and the feeding material into a copper-smelting furnace, the copper concentrate including Al, and the Fe metal source including an Fe metal of 40 mass % to 100 mass %, wherein the Fe metal source comprises one or more Fe metal groups, one of the groups having grain size distribution of a grain diameter of 5 mm to 10 mm, and wherein a supply amount of the Fe metal source per hour into the copper-smelting furnace increases as the concentration of Al2O3 in a slag increases so that a formation of complex oxides FeAl2O4 and Fe3O4 is suppressed by suppressing an oxidation of FeO in the molten metal through the mixing of the Fe metal source and the feeding material.