Patent ID: 8075665

Claim:
A method of reduction treatment for obtaining metallic iron, by reducing zinc and/or iron oxide through heat treatment of zinc-containing iron oxide or zinc oxide or iron oxide, with a reducing material in a reduction furnace, the method comprising: supplying at least one of automobile-originated shredder residue, shredder dust of home electric appliances, waste plastics, refuse derived fuel, refuse paper and plastic fuel, sludge, oil mud, chips of wood, thread debris, rubber debris, and animal and plant residues to the reduction furnace as the reducing material and as a heating material; performing the reduction treatment with the use of the reducing material as the heat source and without using auxiliary fuel; and controlling, using a controller, a cooling unit to maintain a constant temperature in the reduction furnace, wherein the zinc-containing iron oxide or the zinc oxide or the iron oxide is introduced into the reduction furnace after a granulation.