Patent ID: 9034243
Filing Date: 2015-05-19
Classification: C22B,F27B,F27D

Abstract:
1. A method of using a suspension smelting furnace, whereby the suspension smelting furnace comprises a reaction shaft, the method comprising using a concentrate burner, which comprises a fine solid matter supply device comprising a feeder pipe for feeding fine-grained solid matter into the reaction shaft, wherein a mouth of the feeder pipe opens in the reaction shaft; a diffusion device, which is arranged concentrically inside the feeder pipe and which extends to a distance from the mouth of the feeder pipe inside the reaction shaft, and which comprises diffusion gas holes for directing a diffusion gas around the diffusion device to fine solid matter that flows around the diffusion device; and a first gas supply device for feeding a first gas into the reaction shaft, the first gas supply device opening in the reaction shaft through a first annular discharge opening that concentrically surrounds the feeder pipe for mixing first gas that discharges from the said first annular discharge opening with fine solid matter, which discharges from the feeder pipe in a middle and which is directed sidewards by means of diffusion gas; the method comprising feeding fine solid matter into the reaction shaft through the mouth of the feeder pipe of the concentrate burner; feeding diffusion gas into the reaction shaft through the diffusion gas openings of the diffusion device of the concentrate burner for directing diffusion gas to fine solid matter that flows around the diffusion device; and feeding first gas into the reaction shaft through the first annular discharge opening of the first gas supply device of the concentrate burner for mixing first gas with fine solid matter, which discharges from the feeder pipe in the middle and which is directed sidewards by means of diffusion gas; wherein the method employs a concentrate burner, which comprises a second gas supply device, which comprises a second annular discharge opening, which is concentric with the first annular discharge opening of the first gas supply device of the concentrate burner and which opens in the reaction shaft of the suspension smelting furnace; second gas through the second annular discharge opening of the second gas supply device; the first gas and the second gas have different compositions; and the second annular discharge opening surrounds the first annular discharge opening.