Abstract: A suspension smelting furnace is disclosed for the suspension smelting of finely-grained oxide or sulfide ores and concentrates, and provided with a horizontal lower furnace to which have been connected the lower ends of at least one vertical suspension reaction zone and rising flow zone, with devices at the upper end of the suspension reaction zone for the production of a suspension of finely-grained oxide and sulfide ores or concentrates with air and oxygen, and for feeding this suspension downwards in the reaction zone at the lower end of which there are optionally means for the sulfidization or reduction of the suspension, and in the lower furnace under the suspension reaction zone there is the main smelt reaction zone in which the bulk of the suspension dissolves vertically in the smelt accumulated in the lower furnace main reaction zone, and in the rising-flow zone there are devices for removing the remaining suspension at its upper end.