FIELD: metallurgy; direct reduction of iron oxide by means of furnace provided with rotating hearth for forming high-purity iron granules.
SUBSTANCE: proposed method of reduction of sintered materials containing iron oxide and carbon till iron-carbon drops and slag particles are formed on surface of hearth. Then, said drops are separated from slag particles and are cooled till solid iron-carbon granules are formed. Granules are unloaded from furnace and slag particles are removed. Upper layer of hearth is made from refractory material. Additionally, covering materials are applied on upper refractory layer or on glass-like layer before delivery of materials to furnace to exclude action of reduced iron on upper layer of hearth surface. Covering materials include compounds of carbon, iron oxide, silicon oxide magnesium oxide and/or aluminum oxide. Furnace apparatus includes furnace with hearth whose surface is provided with layer of refractory material, unit for loading sintered materials; unit for reduction of these sintered materials is made for forming iron-carbon drops and slag particles and separating them from slag particles. Furnace apparatus is provided with unit for delivery of mixture of covering materials to hearth surface, unit for heating the covering materials, unit for cooling said drops for forming solid iron-carbon granules, unit for removal of these granules from furnace and slag particle removing unit. Proposed method ensures production of solid granules or iron of high purity containing 1 to 5% of carbon.
EFFECT: reduced losses of finished product.
34 cl, 8 dwg
