Method and equipment for smelting non-ferrous metal sulphides in a suspension smelting furnace in order to produce matte of a high non-ferrous metal content and disposable slag
AssigneeOutokumpu Oyj
InventorsIlkka Kojo, Markku Kytö
Life of this patent
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Abstract
The present invention relates to a method and equipment, whereby matte with a high non-ferrous metal content and disposable slag are produced simultaneously in a suspension-smelting furnace from non-ferrous sulphide concentrate. According to the invention, a carbonaceous reducing agent is charged to the lower furnace of a suspension smelting furnace via tuyeres to the part of the furnace which has a reduced cross-sectional area.
Claims12
A method for smelting non-ferrous metal sulphides in a suspension smelting furnace, to produce matte with a high non-ferrous metal content and disposable slag, the method comprising:
- injecting a carbonaceous chemical reducing agent for chemically reducing slag into a throttle point formed in a lower furnace, in which throttle point the width and cross-sectional area of said furnace are decreased the chemical reducing agent being injected, via tuyeres, into a slag layer.
Equipment for smelting non-ferrous metal sulphides in a suspension smelting furnace, producing matte with a high non-ferrous metal content and slag which is reduced for disposal, the equipment comprising a smelting furnace having a reaction shaft, an uptake and a lower furnace which acts as a settler and is arranged below the reaction shaft and uptake, the lower furnace being furnished with a throttle point having a reduced width and reduced cross-sectional area and tuyeres placed therein for introducing a chemical reducing agent.
Dependencies are inferred from the claim text.