To provide a metal melting equipment having a vertical type metal melting furnace 1 which is charged with metallic raw materials Mc together with additives S from a charging port 5 in the upper part of a furnace casing 2, is supplied with combustible powder and granular materials Pb together with oxygen supply gas A from tuyeres 6 in the lower part of the furnace casing 2, melts the metallic raw materials Mc by the combustion heat in the furnace, discharging combustion discharge gas from a furnace top section 3 and discharges molten metal Mm from a furnace bottom section 9 and to provide a reducing agent which is supplied into this vertical type metal melting furnace 1, is capable of facilitating the recovery of useful metal by enhancing the content of the useful metal in dust D and is capable of making the resource recovery of waste plastics by saving the fuel to be supplied into the furnace.

A combustible powder and granular material Pb is formed as the reducing agent by kneading and mixing the dust D from the vertical type metal melting furnace 1 and the valuable metal-containing dust from another steel making furnace or both thereof and a waste plastic crushed material Pd and the vertical type metal melting furnace 1 is provided with a reducing agent supply means 23 constituted so as to supply the combustible powder and granular material Pb to the tuyeres 6.