Process for producing pig iron
AssigneesKorf Engineering GmbH (now Deutsche Voest-Alpine Industrieanlagenbau GmbH), Voest-Alpine Aktiengesellschaft
InventorRolf Hauk
Life of this patent
Estimating the term…
Abstract
A process for producing pig iron is described involving the use of a reduction shaft furnace 1 and a melt-down gasifier 2. The sponge iron produced from iron ore in the reduction shaft furnace is fed into the melt-down gasifier and converted into a pig iron melt. The gas produced in the melt-down gasifier is passed as reducing gas into the reduction shaft furnace both via a cyclone separator 11 and a line 12 and directly via a line 13. The top gas leaving the reduction shaft furnace, after passing through a scrubber 4, is largely returned via a CO.sub.2 scrubber 6, in which CO.sub.2 and H.sub.2 O are removed from the gas, in such a way that it can be used for forming the reducing gas in the melt-down gasifier and also as a cooling gas for the reducing gas produced in said gasifier.
Claims6
In a process for producing pig iron in which iron ore is reduced in a reduction shaft furnace issuing a top gas containing CO.sub.2 and a sponge iron obtained as a result thereof is subsequently passed through a fluidized bed formed within a melt-down gasifier above an O.sub.2 tuyere, a gas and a carbon carrier being introduced into said melt-down gasifier, and a reducing gas produced in said melt-down gasifier being introduced as the reducing gas into said reduction shaft furnace;
- the improvement comprising the steps of compressing and at least partially scrubbing the CO.sub.2 from the top gas issuing from said reduction shaft furnace, and then introducing at least a portion of this scrubbed and compressed top gas into the melt-down gasifier at about half the height of said fluidized bed.
Dependencies are inferred from the claim text.